JP4129168B2 - Position detection apparatus, position detection method, and position detection program - Google Patents

Description

【００６７】
【数２】

【００６８】
なお、前記（２）式、（３）式及び（４）式において、α及びβを既知の定数として説明したが、操作者が、操作をはじめる前に位置指定装置１０からのビーム光Ｂによって、例えば画面の中心位置等の特定場所を指示し、そのとき検出された第一照射位置Ｌの光強度Ｉ₁及び第二照射位置Ｒの光強度Ｉ₂を（３）式及び（４）式に代入することで、α及びβを予め得ることも可能である。
【００６９】
また、βはプローブ光Ｐの中心（指定位置Ｔ）における光強度に相当する。そこで、プローブ光Ｐの広がり角をφ、位置指定装置１０の光源（図示せず）の出力光強度をβ₀、位置指定装置１０から表示装置３０の画面までの距離をｄとすると、βを（７）式で表すことができる。
【００７０】
【数３】

【００７１】
すなわち、位置指定装置１０の光源（図示せず）の出力光強度β₀を予め測定しておくことで、位置指定装置１０から表示装置３０の画面までの距離ｄを、（８）式で算出することができる。
【００７２】
【数４】

【００７３】
さらに指示位置算出部２５では、プローブ光Ｐの傾き、すなわち位置指定装置１０の表示装置３０の画面に対する傾きθを、（９）式によって算出することもできる。
【００７４】
θ＝ｔａｎ^-1｛（ｙ₂−ｙ₁）／（ｘ₂−ｘ₁）｝ …（９）
【００７５】
以上、一実施形態に基づいて、画像表示システム１の構成について説明したが、本発明はこれに限定されるものではない。例えば、ここでは、光検出器２２を一列に配列した光検出器アレイ２１を表示装置３０の左右の表示領域外に設置したが、表示装置３０の上下の表示領域外に設置する構成としてもよい。この場合、位置指定装置１０における波形整形部１２ｂ（図２）では、プローブ光（スリット拡散光）Ｐを垂直（縦）方向に拡散させるものとする。
【００７６】
さらに、光検出器アレイ２１は表示装置３０の上下左右のいずれか１つの表示領域外に、光検出器２２を二列に配列したものを設置する構成としてもよい。
例えば、図５に示すように、光検出器アレイ２１を、表示装置３０の左側の表示領域外に２つ配置し、光検出器２２を二列に並列に配列した構成において、スリット状に広がったプローブ光Ｐが、中心と周辺とで直線的に異なる光強度分布を持つ場合、α及びβ（α，β＞０）を既知の定数、ｌをプローブ光Ｐの中心（指定位置Ｔ）からの距離とすると、光強度Ｉは前記（２）式で表現される。
【００７７】
すなわち、第一照射位置Ｌの光強度Ｉ₁及び第二照射位置Ｒの光強度Ｉ₂は、それぞれ前記した（３）式及び前記（４）式と同様に表現される。
これにより、指示位置算出部２５（図３）では、前記した（３）式及び（４）式に基づいて、指定位置Ｔの座標（ｘ，ｙ）を（１０）式及び（１１）式のように算出することができる。
【００７８】
【数５】

【００７９】
【数６】

【００８０】
なお、（１０）式及び（１１）式におけるα及びβは、操作者が、操作をはじめる前に位置指定装置１０からのビーム光Ｂによって、例えば画面の中心位置等の特定場所を指示し、そのとき検出された第一照射位置Ｌの光強度Ｉ₁及び第二照射位置Ｒの光強度Ｉ₂を（３）式及び（４）式に代入することで、予め求めておくこととしてもよい。
【００８１】
また、位置指定装置１０の光源（図示せず）の出力光強度をβ₀、プローブ光Ｐの広がり角をφとすると、位置指定装置１０から表示装置３０の画面までの距離ｄを、前記（８）式で算出することができる。さらに、プローブ光Ｐの傾き、すなわち位置指定装置１０の表示装置３０の画面に対する傾きθを、前記（９）式によって算出することもできる。
【００８２】
（画像表示システム１の動作）
次に、図１、図３及び図６を参照して、画像表示システム１の動作について説明する。図６は、画像表示システム１の動作を示すフローチャートである。
【００８３】
＜光投射ステップ＞
まず、操作者が、リモコン装置２を表示装置３０に向け、投射ボタン（図示せず）を押下することで、位置指定装置１０からビーム光（位置指示光）Ｂとプローブ光（スリット拡散光）Ｐとが、表示装置３０の画面に投射される（ステップＳ１）。このビーム光Ｂは、操作者が所望する画面上の指定位置Ｔを視覚して指し示す可視光であり、プローブ光Ｐは、位置検出装置２０が指定位置Ｔを算出するために用いられる、中心と周辺とで異なる光強度分布を持つスリット状の不可視光である。
【００８４】
＜光検出ステップ＞
そして、位置検出装置２０の光検出器２２が、位置指定装置１０から投射されたプローブ光Ｐを受光（検出）する（ステップＳ２）。なお、ここでは、光検出器２２は、表示装置３０の左右の表示領域外に光検出器アレイ２１として一列に配置されているものとする。
【００８５】
＜照射位置検出ステップ＞
そして、位置検出装置２０の光強度測定部２４ａが、ステップＳ２で受光したプローブ光Ｐの各光検出器２２における光の強度（光強度）を測定する（ステップＳ３）。この光検出器２２における光強度を測定することで、照射位置検出部２４は、表示装置３０の左右に配置された光検出器アレイ２１毎に、光強度が最も強かった光検出器２２の位置（第一照射位置Ｌ及び第二照射位置Ｒ）を、プローブ光Ｐが照射された照射位置として特定する（ステップＳ４）。
【００８６】
＜指示位置算出ステップ＞
ステップＳ３で測定された光強度とステップＳ４で特定された光検出器２２の照射位置（第一照射位置Ｌ及び第二照射位置Ｒ）とに基づいて、指示位置算出部２５が、表示装置３０の画面上の指定位置Ｔを算出する（ステップＳ５）。この指定位置Ｔの算出は、前記した（５）式及び（６）式に基づいて行われる。
【００８７】
＜画像表示ステップ＞
ステップＳ５で算出された指定位置Ｔに基づいて、画像表示制御装置４０が画面の表示を制御する（ステップＳ６）。例えば、指示された位置がメニュー画面のボタンの場合は、そのボタンが選択されたものとして動作を行う。
【００８８】
以上の各ステップによって、位置指定装置１０から投射される可視光のビーム光Ｂを直接画面上に投射することで、操作者は画面上で指示したい位置を直接指し示すことが可能になると共に、位置検出装置２０によって、操作者によって指し示された指示位置Ｔを検出することができる。
【００８９】
なお、指示位置算出ステップ（ステップＳ５）で、位置指定装置１０から表示装置３０の画面までの距離や、位置指定装置１０の表示装置３０の画面に対する傾きを算出することで、画像表示ステップ（ステップＳ６）において、位置指定装置１０の距離に基づいて画像を拡大・縮小させたり、位置指定装置１０の傾きに基づいて画像を回転させたり等の種々の動作を行うことも可能である。
【００９０】
［第二の実施の形態］
次に、図７を参照して、参考例である第二の実施の形態に係る位置指定装置１０Ｂ及び位置検出装置２０Ｂを含んだ画像表示システム１Ｂについて説明する。図７は、画像表示システム１Ｂの構成を示した概略図である。図７に示したように画像表示システム１Ｂは、位置指定装置１０Ｂを備えたリモコン装置２Ｂ、光検出器２２を複数配列した光検出器アレイ２１と光信号検出処理手段２３Ｂとを備えた位置検出装置２０Ｂ、表示装置３０及び画像表示制御装置４０で構成されている。なお、画像表示装置３Ｂは、位置検出装置２０Ｂ、表示装置３０及び画像表示制御装置４０で構成されている。
【００９１】
この画像表示システム１Ｂは、位置検出装置２０Ｂによって、リモコン装置２Ｂから照射される可視光のビーム光Ｂで指し示される表示装置３０の画面上の指定位置Ｔを、ビーム光Ｂと同時に照射されるプローブ光（スリット拡散光）Ｐ１及びＰ２から算出し、その指定位置Ｔに基づいて画像表示の制御を行うものである。
【００９２】
リモコン装置２Ｂは、位置指定装置１０Ｂを備え、表示装置３０における画面上の任意の位置を指し示すと共に、操作者が画像表示装置３に対して、操作を指示するものである。この位置指定装置１０は、可視光のビーム光Ｂと、そのビーム光Ｂを中心に交差（クロス）した２つのスリット状の拡散光であるプローブ光Ｐ１及びＰ２とを投射するものである。
【００９３】
位置指定装置１０Ｂは、図８に示すように、位置指定装置１０（図２）の波形整形部１２ｂを、十字にクロスしたスリット拡散光を生成するように機能を変更した波形整形部１２Ｂｂとすることで実現することができる。この波形整形部１２Ｂｂは、例えば、第二光源部１２ａから出力された光を光学的に二分配し、それぞれの光を集光方向の異なる２つのシリンドリカルレンズに通すことで、スリット状の拡散光を生成し、これら２つの拡散光の光軸を合わせて投射することで、２つの交差した拡散光（スリット拡散光）を生成することができる。あるいは、入力された光を十字の干渉縞として整形するホログラム回折光学素子を用いて、十字にクロスしたスリット拡散光を生成することもできる。
【００９４】
画像表示装置３Ｂは、位置検出装置２０Ｂ、表示装置３０及び画像表示制御装置４０を備え、リモコン装置２Ｂから照射されるプローブ光Ｐ１及びＰ２に基づいて、操作者がリモコン装置２Ｂのビーム光Ｂで指し示した位置を検出すると共に、操作者が所望する画像を表示するものである。表示装置３０及び画像表示制御装置４０は、図１に示したものと同一であるので、説明を省略する。
【００９５】
位置検出装置２０Ｂは、表示装置３０の上下左右の表示領域外に複数の光検出器２２を配列した光検出器アレイ２１と光信号検出処理手段２３Ｂとを備え、リモコン装置２Ｂから出射されるプローブ光Ｐ１及びＰ２に基づいて、操作者がリモコン装置２Ｂのビーム光Ｂで指し示す画面上の指定位置Ｔを検出するものである。
【００９６】
光信号検出処理手段２３Ｂについては、図３及び図７を参照して説明を行う。
光信号検出処理手段２３Ｂは、図３に示すように光信号検出処理手段２３の構成において、照射位置検出部２４及び指示位置算出部２５を、それぞれ機能を変更した照射位置検出部２４Ｂ及び指示位置算出部２５Ｂとすることで実現することができる。
【００９７】
照射位置検出部２４Ｂは、表示装置３０の上下左右の表示領域外に設置された４つの光検出器アレイ２１毎に光強度が最も強かった光検出器２２の照射位置を検出する。この光検出器２２の照射位置及び光強度は、指示位置算出部２５Ｂに出力される。
【００９８】
指示位置算出部２５Ｂは、照射位置検出部２４Ｂから出力される光検出器２２の照射位置に基づいて、画面上の指定位置Ｔを算出するものである。また、指示位置算出部２５Ｂは、照射位置検出部２４Ｂから出力される光検出器２２の光強度に基づいて、位置指定装置１０Ｂから表示装置３０の画面までの距離を算出するものでもある。
【００９９】
ここで、図９を参照（適宜図３参照）して、指示位置算出部２５Ｂがプローブ光Ｐ１及びＰ２を受光した光検出器２２の位置に基づいて、指定位置Ｔを算出する方法について説明する。図９に示すように、位置指定装置１０Ｂは、表示装置３０に対してビーム光Ｂとプローブ光Ｐ１及びＰ２とを投射しているものとする。
【０１００】
ここで、表示装置３０の画面に対して横方向をｘ軸、縦方向をｙ軸とし、表示装置３０の上下左右に配置された個々の光検出器アレイ２１毎に光強度が最も強かった光検出器２２の照射位置がＬ（第一照射位置）、Ｒ（第二照射位置）、Ｕ（第三照射位置）及びＤ（第四照射位置）で、第一照射位置Ｌの座標が（ｘ₁，ｙ₁）、第二照射位置Ｒの座標が（ｘ₂，ｙ₂）、第三照射位置Ｕの座標が（ｘ₃，ｙ₃）、第四照射位置Ｄの座標が（ｘ₄，ｙ₄）であったとする。
【０１０１】
このとき、ビーム光Ｂで指し示された指定位置Ｔの座標（ｘ，ｙ）は、（１２）式で示した第一照射位置Ｌと第二照射位置Ｒとを結んだ直線と、（１３）式で示した第三照射位置Ｕと第四照射位置Ｄとを結んだ直線との交点となる。
【０１０２】
ｙ＝｛（ｙ₂−ｙ₁）／（ｘ₂−ｘ₁）｝・ｘ＋ｙ₁−｛（ｙ₂−ｙ₁）／（ｘ₂−ｘ₁）｝・ｘ₁ …（１２）
ｙ＝｛（ｙ₄−ｙ₃）／（ｘ₄−ｘ₃）｝・ｘ＋ｙ₃−｛（ｙ₄−ｙ₃）／（ｘ₄−ｘ₃）｝・ｘ₃ …（１３）
【０１０３】
すなわち、指定位置Ｔの座標（ｘ，ｙ）は、（１４）式及び（１５）式で求めることができる。
【０１０４】
【数７】

【０１０５】
【数８】

【０１０６】
このように、位置検出装置２０Ｂは、指定位置Ｔの算出においてプローブ光Ｐ１及びＰ２の光強度分布を考慮する必要がないため、外乱の影響を受けにくく光検出器２２の数を増やすことで、位置検出の精度を高めることができる。
【０１０７】
また、指示位置算出部２５Ｂでは、前記した（１４）式及び（１５）式によって、指定位置Ｔの座標（ｘ，ｙ）が求められるため、さらに、第一照射位置Ｌと指定位置Ｔとの距離ｌ_L及び第二照射位置Ｒと指定位置Ｔとの距離ｌ_Rを、（１６）式及び（１７）式で求めることもできる。
【０１０８】
【数９】

【０１０９】
【数１０】

【０１１０】
また、スリット状に広がったプローブ光Ｐが、中心と周辺とで直線的に異なる光強度分布を持つ場合、α及びβ（α，β＞０）を既知の定数、ｌをプローブ光Ｐの中心（指定位置Ｔ）からの距離とすると、光強度Ｉは前記（２）式で表現されることから、第一照射位置Ｌの光強度Ｉ_L及び第二照射位置Ｒの光強度Ｉ_Rは、それぞれ（１８）式及び（１９）式となる。なお、この（１８）式及び（１９）式により、βは（２０）式となる。
【０１１１】
Ｉ_L＝−αｌ_L＋β …（１８）
Ｉ_R＝−αｌ_R＋β …（１９）
【０１１２】
【数１１】

【０１１３】
ここで、プローブ光Ｐの広がり角をφ、位置指定装置１０Ｂの光源（図示せず）の出力光強度をβ₀、位置指定装置１０Ｂから表示装置３０の画面までの距離をｄとすると、βは前記（７）式で表現されることから、出力光強度β₀を予め測定しておくことで、位置指定装置１０Ｂから表示装置３０の画面までの距離ｄを、（２１）式で算出することができる。
【０１１４】
【数１２】

【０１１５】
なお、位置指定装置１０Ｂの表示装置３０の画面に対する傾きは、図４で説明した方法と同様に算出することができる。
【０１１６】
以上、一実施形態に基づいて、画像表示システム１Ｂの構成について説明したが、本発明はこれに限定されるものではない。例えば、ここでは、光検出器２２を一列に配列した光検出器アレイ２１を表示装置３０の上下左右の表示領域外に設置したが、表示装置３０の上下いずれか一方及び左右いずれか一方の表示領域外に、光検出器２２を二列に並列に配列したものを設置する構成としてもよい。
【０１１７】
例えば、図１０に示したように、光検出器アレイ２１を、表示装置３０の左側及び下側の表示領域外にそれぞれ２つ配置し、光検出器２２を二列に並列に配列した構成において、第一照射位置Ｌと第二照射位置Ｒとを結んだ直線と、第三照射位置Ｕと第四照射位置Ｄとを結んだ直線との交点として、前記した（１４）式及び（１５）式によって指示位置Ｔを算出することができる。
【０１１８】
さらに、第一照射位置Ｌと指定位置Ｔとの距離ｌ_L及び第二照射位置Ｒと指定位置Ｔとの距離ｌ_Rも、前記した（１６）式及び（１７）式で算出することができる。
【０１１９】
また、スリット状に広がったプローブ光Ｐが、中心と周辺とで直線的に異なる光強度分布を持つ場合、プローブ光Ｐの広がり角をφ、位置指定装置１０Ｂの光源（図示せず）の出力光強度をβ₀、位置指定装置１０Ｂから表示装置３０の画面までの距離をｄとすると、βは前記（７）式で表現されることから、出力光強度β₀を予め測定しておくことで、位置指定装置１０Ｂから表示装置３０の画面までの距離ｄを、前記した（８）式で算出することができる。なお、位置指定装置１０Ｂの表示装置３０の画面に対する傾きは、図４で説明した方法と同様に算出することができる。
【０１２０】
（画像表示システム１Ｂの動作）
次に、図３、図７及び図１１を参照して、画像表示システム１Ｂの動作について説明する。図１１は、画像表示システム１Ｂの動作を示すフローチャートである。
【０１２１】
＜光投射ステップ＞
まず、操作者が、リモコン装置２Ｂを表示装置３０に向け、投射ボタン（図示せず）を押下することで、位置指定装置１０Ｂからビーム光（位置指示光）Ｂと十字にクロスしたプローブ光（スリット拡散光）Ｐ１及びＰ２とが、表示装置３０の画面に投射される（ステップＳ１１）。
【０１２２】
＜光検出ステップ＞
そして、位置検出装置２０Ｂの光検出器２２が、位置指定装置１０Ｂから投射されたプローブ光Ｐ１及びＰ２を受光（検出）する（ステップＳ１２）。なお、ここでは、光検出器２２は、表示装置３０の上下左右の表示領域外に光検出器アレイ２１として一列に配置されているものとする。
【０１２３】
＜照射位置検出ステップ＞
そして、位置検出装置２０Ｂの光強度測定部２４ａが、ステップＳ１２で受光したプローブ光Ｐ１及びＰ２の各光検出器２２における光の強度（光強度）を測定する（ステップＳ１３）。この光検出器２２における光強度を測定することで、照射位置検出部２４Ｂは、表示装置３０の上下左右に配置された光検出器アレイ２１毎に、光強度が最も強かった光検出器２２の位置（第一照射位置Ｌ、第二照射位置Ｒ、第三照射位置Ｕ及び第四照射位置Ｄ）を、プローブ光Ｐ１及びＰ２が照射された照射位置として特定する（ステップＳ１４）。
【０１２４】
＜指示位置算出ステップ＞
そして、指示位置算出部２５Ｂが、ステップＳ１４で特定された光検出器２２の照射位置である第一照射位置Ｌと第二照射位置Ｒとを結んだ直線と、第三照射位置Ｕと第四照射位置Ｄとを結んだ直線との交点を、表示装置３０の画面上の指定位置Ｔとして算出する（ステップＳ１５）。この指定位置Ｔの算出は、前記した（１４）式及び（１５）式に基づいて行われる。
【０１２５】
＜画像表示ステップ＞
ステップＳ１５で算出された指定位置Ｔに基づいて、画像表示制御装置４０が画面の表示を制御する（ステップＳ１６）。例えば、指示された位置がメニュー画面のボタンの場合は、そのボタンが選択されたものとして動作を行う。
【０１２６】
［第三の実施の形態］
次に、図１２を参照して、参考例である第三の実施の形態に係る位置指定装置１０Ｃ及び位置検出装置２０Ｃを含んだ画像表示システム１Ｃについて説明する。図１２は、画像表示システム１Ｃの構成を示した概略図である。図１２に示したように画像表示システム１Ｃは、位置指定装置１０Ｃを備えたリモコン装置２Ｃ、光検出器２２を複数配列した光検出器アレイ２１と光信号検出処理手段２３Ｃとを備えた位置検出装置２０Ｃ、表示装置３０及び画像表示制御装置４０で構成されている。なお、画像表示装置３Ｃは、位置検出装置２０Ｃ、表示装置３０及び画像表示制御装置４０で構成されている。
【０１２７】
この画像表示システム１Ｃは、位置検出装置２０Ｃによって、リモコン装置２Ｃから照射される可視光のビーム光Ｂで指し示される表示装置３０の画面上の指定位置Ｔを、ビーム光Ｂと同時に照射されるプローブ光（スリット拡散光）Ｐ１及びＰ２から算出し、その指定位置Ｔに基づいて画像表示の制御を行うものである。表示装置３０及び画像表示制御装置４０は、図１に示したものと同一であるので、説明を省略する。
【０１２８】
（位置指定装置１０Ｃの構成）
ここで図１３を参照（適宜図１２参照）して、第三の実施の形態である画像表示システム１Ｃにおけるリモコン装置２Ｃ内の位置指定装置１０Ｃの構成について説明する。図１３は、位置指定装置１０Ｃの構成を示すブロック図である。図１３に示したように位置指定装置１０Ｃは、第一光投射手段１１と、第二光投射手段１２Ｃと、光合成投射手段１３と、強度変調手段１４とを備えて構成した。第一光出射手段１１及び光合成投射手段１３は図２で説明したものと同じものであり、第二光出射手段１２Ｃの波形整形部１２Ｂｂは図８で説明したものと同じものであるので、ここでは説明を省略する。
【０１２９】
第二光源部１２Ｃａは、後記する強度変調手段１４から出力される強度変調信号に基づいて、光強度を時間に伴って変化させた不可視光を出力する光源である。この第二光源部１２Ｃａは、例えばレーザダイオード、発光ダイオード等で、赤外線等の不可視光を出力するものとする。この第二光源部１２Ｃａから出力された不可視光は波形整形部１２Ｂｂに入力される。
【０１３０】
強度変調手段１４は、時間に伴って異なる強さの強度変調信号を生成するものである。例えば、既知の正弦波発生回路等によって、正弦波の位相に応じた強度の信号（強度変調信号）を生成する。ここで生成された強度変調信号は第二光源部１２Ｃａに入力される。
このように位置指定装置１０Ｃを構成することで、プローブ光Ｐ１及びＰ２の位相を変化させることができる。
【０１３１】
（位置検出装置２０Ｃの構成）
次に、図１４を参照（適宜図１２参照）して、第三の実施の形態である画像表示システム１Ｃにおける画像表示装置３Ｃ内の位置検出装置２０Ｃの構成について説明する。図１４は、位置検出装置２０Ｃの構成を示すブロック図である。図１４に示したように位置検出装置２０Ｃは、光検出器２２を配列した光検出器アレイ２１と、照射位置検出部２４Ｃ及び指示位置算出部２５Ｃを含んだ光信号検出処理手段２３Ｃとを備えて構成した。位相検出部２４ｂ及び指示位置算出部２５Ｃ以外の構成は、図３と同様であるので同一の符号を付して説明を省略する。
【０１３２】
位相検出部（位相検出手段）２４ｂは、光検出器２２で検出されたプローブ光Ｐ１及びＰ２の位相を検出するものである。この位相検出部２４ｂでは、光強度測定部２４ａで光検出器アレイ２１毎に光強度が最も強かった光検出器２２で検出された信号の位相を検出する。例えば、図１２においては、プローブ光Ｐ１及びＰ２が照射されている第一照射位置Ｌ、第二照射位置Ｒ、第三照射位置Ｕ及び第四照射位置Ｄにおける信号の位相を検出する。ここで検出された位相は、指示位置算出部２５Ｃに出力される。
【０１３３】
指示位置算出部（指示位置算出手段）２５Ｃは、照射位置検出部２４Ｃから出力される光検出器２２の照射位置と、位相検出部２４ｂで検出された照射位置の位相とに基づいて、画面上の指定位置Ｔ及び位置指定装置１０Ｃの位置を算出するものである。
【０１３４】
ここで、図１５を参照（適宜図１４参照）して、指示位置算出部２５Ｃが光検出器２２の照射位置及びその照射位置における位相に基づいて、位置指定装置１０Ｃの位置（三次元位置）を算出する方法について説明する。
【０１３５】
ここで、表示装置３０の画面に対して横方向をｘ軸、縦方向をｙ軸、そのｘｙ平面に対して垂直方向をｄ軸とし、表示装置３０の上下左右に配置された個々の光検出器アレイ２１毎に光強度が最も強かった光検出器２２の照射位置がＬ（第一照射位置）、Ｒ（第二照射位置）、Ｕ（第三照射位置）及びＤ（第四照射位置）で、それぞれの座標が（ｘ₁，ｙ₁）、（ｘ₂，ｙ₂）、（ｘ₃，ｙ₃）及び（ｘ₄，ｙ₄）であったとする。さらに、それぞれの照射位置（Ｌ、Ｒ、Ｕ及びＤ）で検出した位相がθ₁、θ₂、θ₃及びθ₄であったとする。
【０１３６】
このとき、それぞれの照射位置（Ｌ、Ｒ、Ｕ及びＤ）から位置指定装置１０Ｃまでの距離ｄ１、ｄ２、ｄ３及びｄ４は、以下の（２２）〜（２５）式で求められる。なお、ｃは光速度、ｆはプローブ光Ｐ１及びＰ２の強度変調周波数である。
【０１３７】
ｄ₁＝θ₁・ｃ／（２πｆ） …（２２）
ｄ₂＝θ₂・ｃ／（２πｆ） …（２３）
ｄ₃＝θ₃・ｃ／（２πｆ） …（２４）
ｄ₄＝θ₄・ｃ／（２πｆ） …（２５）
【０１３８】
さらに、位置指定装置１０Ｃの位置をＯ（ｘ₀，ｙ₀，ｄ₀）とすると、以下の（２６）〜（２９）式の関係が成り立つ。
【０１３９】
（ｘ₀−ｘ₁）²＋（ｙ₀−ｙ₁）²＋ｄ₀ ²＝ｄ₁ ² …（２６）
（ｘ₀−ｘ₂）²＋（ｙ₀−ｙ₂）²＋ｄ₀ ²＝ｄ₂ ² …（２７）
（ｘ₀−ｘ₃）²＋（ｙ₀−ｙ₃）²＋ｄ₀ ²＝ｄ₃ ² …（２８）
（ｘ₀−ｘ₄）²＋（ｙ₀−ｙ₄）²＋ｄ₀ ²＝ｄ₄ ² …（２９）
【０１４０】
指示位置算出部２５Ｃでは、前記した（２６）〜（２９）式に基づいて、位置指定装置１０Ｃの位置Ｏ（ｘ₀，ｙ₀，ｄ₀）を（３０）〜（３２）式で算出することができる。
【０１４１】
【数１３】

【０１４２】
【数１４】

【０１４３】
【数１５】

【０１４４】
なお、指定位置Ｔや位置指定装置１０Ｃの表示装置３０の画面に対する傾きは、図４及び図９で説明した方法で算出することができる。
【０１４５】
以上、説明したように、位置検出装置２０Ｃは、スリット状の拡散光であるプローブ光Ｐ１及びＰ２の光強度分布を考慮することなく、位置指定装置１０Ｃの位置Ｏを求めることができる。このように、位置検出装置２０Ｃは、外光等によって変化を受けやすい光強度分布を用いないため、高精度に位置指定装置１０Ｃの位置Ｏを求めることが可能になる。
【０１４６】
また、位置検出装置２０Ｃは、位置指定装置１０Ｃの三次元の位置を検出することができるため、位置指定装置１０Ｃを含んだリモコン装置２Ｃ（図１２）の前後、左右又は上下の動きに応じて、表示装置３０の画面に表示された画像を切り替える等のアプリケーションを容易に構築することができる。
【０１４７】
［第四の実施の形態］
次に、図１６を参照して、本発明における第四の実施の形態に係る位置検出装置２０Ｄの構成について説明する。前記した第一乃至第三の実施の形態（図１、図７及び図１２）において、光検出器２２は、光を検出して電気信号に変換する、例えばフォトディテクタ等の受光素子を用いることとして説明を行ったが、マイクロレンズを用いることとしてもよい。図１６は、マイクロレンズを用いた位置検出装置２０Ｄの構成を示すブロック図である。
【０１４８】
図１６に示したように位置検出装置２０Ｄは、マイクロレンズ２２Ｂを配列したマイクロレンズアレイ２１Ｂと、照射位置検出部２４、指示位置算出部２５及び光電変換部２６を含んだ光信号検出処理手段２３Ｄとを備えて構成した。照射位置検出部２４及び指示位置算出部２５は、図３で説明したものと同一であるので説明を省略する。
【０１４９】
マイクロレンズアレイ２１Ｂは、マイクロレンズ２２Ｂを一列に複数配置して、位置指定装置１０（１０Ｂ、１０Ｃ）（図１、図７及び図１２）から照射されるプローブ光（スリット拡散光）を検出するものである。
【０１５０】
マイクロレンズ２２Ｂは、数μｍから数ｍｍ程度の大きさの微小なレンズであり、光を検出する光検出手段としての役割を果たすものである。このマイクロレンズ２２Ｂで受光した光は、光ファイバＦを介して光電変換部２６に入力される。
【０１５１】
光電変換部２６は、リニアセンサ、二次元センサ等で構成され、光ファイバＦを介して入力される光信号を電気信号に変換するものである。例えば、既存のＣＣＤを用いた一次元センサ（ＣＣＤラインセンサ）や、二次元センサ（ＣＣＤエリアセンサ）等を使用することができる。特に二次元センサを使用した場合は、照射位置検出部２４及び指示位置算出部２５は、受光し電気信号に変換された信号を二次元の画像とみなし、照射位置及び指示位置を特定することができる。
このように、位置検出装置２０Ｄは、既存のＣＣＤ等の一次元センサや二次元センサを使用することができるため、低コストで構築することができる。
【０１５２】
［第五の実施の形態］
次に、図１７を参照して、本発明における第五の実施の形態に係る位置検出装置２０Ｅの構成について説明する。前記した第四の実施の形態（図１６）において、光電変換部２６として、既存のＣＣＤ等の一次元センサや二次元センサを用いた例について説明したが、蓄積型の一次元センサや二次元センサ（例えば、蓄積型ＣＣＤ）を用いることも可能である。この場合、蓄積型ＣＣＤ等では露出時間が長いため、図１３で説明した位置指定装置１０Ｃから出力される強度変調されたプローブ光の位相を検出することができない。
【０１５３】
そこで、位置検出装置２０Ｅは、図１７に示したように、マイクロレンズ２２Ｂを配列したマイクロレンズアレイ２１Ｂと、照射位置検出部２４、指示位置算出部２５、光電変換部２６Ｅ及び信号抽出部２７を含んだ光信号検出処理手段２３Ｅとを備えて構成した。光電変換部２６Ｅ及び信号抽出部２７以外の構成は、図３と同一のものであるので同一の符号を付し説明を省略する。
【０１５４】
光電変換部２６Ｅは、蓄積型の二次元センサ等で構成され、光信号を電気信号に変換するものである。この光電変換部２６Ｅは、例えば蓄積型ＣＣＤを用いることで、露光時間を長くすることができるため、受光した光量を上げて感度を高めることができる。
【０１５５】
信号抽出部２７は、光ファイバＦを介して入力される光信号を特定の時間間隔でサンプリング（抽出）するものである。この信号抽出部２７は、例えば、光速サンプリング素子として、高速ゲート付イメージインテンシファイアを用いることができる。
【０１５６】
ここで、図１８を参照（適宜図１３、図１７参照）して、位置検出装置２０Ｅが光検出器（マイクロレンズ２２Ｂ）から位置指定装置１０Ｃまでの距離を算出する方法について説明する。図１８は、位置指定装置１０Ｃから照射される強度変調されたプローブ光の時間と光強度（受光強度）の関係を示したグラフである。Ｉは最大受光強度を示し、Ｔは周期を示している。
【０１５７】
マイクロレンズ２２Ｂから位置指定装置１０Ｃまでの距離をｄ、マイクロレンズ２２Ｂで受光したプローブ光の受光強度をＩ_dとしたとき、ある時間ｔにおける受光強度Ｉ_dが（３３）式で表されるものとする。なお、ｆは強度変調周波数、ｃは光速度を表す。
【０１５８】
Ｉ_d＝Ｉ・ｓｉｎ²｛２πｆ（ｔ＋ｄ／ｃ）｝ …（３３）
【０１５９】
ここで、信号抽出部２７の第一サンプリング時間をｔ₁、第二サンプリング時間をｔ₂＝ｔ₁＋Ｔ／２とする。このとき、第一サンプリング時間ｔ₁及び第二サンプリング時間ｔ₂で受光したプローブ光の受光強度Ｉ₁及びＩ₂は、（３４）式及び（３５）式で表すことができる。
【０１６０】

【０１６１】
また、最大受光強度Ｉは、（３６）式により求めることができる。
【０１６２】
Ｉ＝Ｉ₁＋Ｉ₂ …（３６）
【０１６３】
さらに、マイクロレンズ２２Ｂから位置指定装置１０Ｃまでの距離ｄは、（３７）式により算出することができる。
【０１６４】
Ｉ₁／Ｉ₂＝ｔａｎ²｛２πｆ（ｔ₁＋ｄ／ｃ）｝ …（３７）
【０１６５】
以上、説明したように位置検出装置２０Ｅは、外光等によって変化を受けやすい光強度分布を用いないため、高精度に位置指定装置１０Ｃの位置を求めることが可能になる。さらに、光電変換部２６Ｅとして蓄積型ＣＣＤを使用することができるため、受光感度を高めることができる。
【０１６６】
［位置指定装置及び位置検出装置の利用例］
次に、図１９及び図２０を参照して、本発明に係る位置指定装置及び位置検出装置の利用例について説明する。
図１９は、テレビ受像機、コンピュータディスプレイ等に本発明を適用した例を示す図である。図１９（ａ）は、操作者Ｍが、位置指定装置（図示せず）を備えたリモコン装置２によって、位置検出装置（図示せず）を備えた画像表示装置３（テレビ受像機、コンピュータディスプレイ等）を操作している状態を示す模式図である。図１９（ｂ）は、操作者Ｍが、位置指定装置１０を備えたメガネ４によって、位置検出装置（図示せず）を備えた画像表示装置３を操作している状態を示す模式図である。
【０１６７】
図１９（ａ）に示すように、操作者Ｍは、画像表示装置３の画面に表示されたメニュー画面等のボタンを、直接リモコン装置２から投射されるビーム光によって指し示すことができる。これによって、従来、上下左右の方向キーを数回押下して決定ボタンを押下することで所望のボタン位置を選択していたところを、所望のボタン位置にビーム光を照射させて決定キーを押下するだけで所望のボタン位置を選択することが可能になり、操作性を向上させることができる。
【０１６８】
さらに、画面上にカーソルが表示されて位置を特定する場合であっても、カーソル位置をビーム光に合わせて動作させることができる。これによって、従来、マウス等の入力手段を適当な量だけ移動させることでカーソルの移動を行っていたところを、直接リモコン装置２のビーム光によって移動させることが可能になる。
【０１６９】
また、図１９（ｂ）に示すように、位置指定装置１０を備えたメガネ４を装着した操作者Ｍが、画像表示装置３の画面の方向を向き、メニュー画面の所望のボタン位置にビーム光を一定時間照射することで、ボタンを選択することができる。これによって、例えば、手の障害等でリモコン装置２（図１９（ａ））を操作することができない人に対しても、画像表示装置３の操作手段を提供することができる。
【０１７０】
さらに、コンピュータディスプレイで位置指定装置１０を備えたメガネ４を使用すれば、キーボードから手を離すことなくカーソルの動作等の画面操作を行うことが可能になり、操作性を向上させることができる。
【０１７１】
図２０は、表示画像の中から、詳細に見たい部分を拡大することが可能なバーチャルスコープに本発明を適用した例を示す図である。図２０（ａ）は、バーチャルスコープに使用する表示画像の拡大領域を指定する虫メガネＳＣの構成を示す概略図である。図２０（ｂ−１）、（ｂ−２）は、虫メガネＳＣの位置に基づいて、画像が拡大される様子を示す概念図である。なお、バーチャルスコープは、「深谷、三ッ峰、井上、“バーチャルスコープ”、第７回画像センシングシンポジウム講演論文集、ｐｐ．２１１−２１４、２００１」等に開示されている。
【０１７２】
図２０（ａ）に示すように、バーチャルスコープに使用する虫メガネＳＣは、内部に位置指定装置１０を備えている。なお、この位置指定装置１０から照射されるビーム光Ｂは、一点を照射するものではなく、矩形領域を照射するレーザ光を用いる。この場合、レーザ光で照射された画面上における矩形領域の各頂点の座標は、矩形領域の中心の照射位置に対して、虫メガネＳＣと画面との距離及びレーザ光の投射角度に基づいて演算を行うことで容易に算出することができる。
【０１７３】
また、図２０（ｂ−１）に示すように、画面Ｇからｄ１だけ離れた位置から、虫メガネＳＣのビーム光Ｂを画面Ｇに対して照射することで、ビーム光Ｂによって画面Ｇ上に照射された矩形領域ｇ１の画像が拡大表示（拡大画像Ｅ１）される。この拡大画像Ｅ１は、画面Ｇが切り替わって表示されることとしてもよいし、別の表示装置に表示されることとしてもよい。
【０１７４】
図２０（ｂ−２）は、図２０（ｂ−１）における距離ｄ１をさらに離した状態（距離ｄ２：ｄ１＜ｄ２）を表している。このように、ｄ１より遠い位置に虫メガネＳＣを配置することで、画面Ｇに照射される矩形領域ｇ２は、図２０（ｂ−１）の矩形領域ｇ１よりも大きくなるため、拡大表示された拡大画像Ｅ２は、図２０（ｂ−１）の拡大画像Ｅ１よりも拡大率が小さくなる。
【０１７５】
このように、本発明に係る位置指定装置及び位置検出装置は、テレビ受像機等のリモコン装置としての利用、コンピュータにおけるマウス等の入力装置としての利用、バーチャルスコープとしての利用等、表示画面を持つ種々の装置において応用することが可能である。
【０１７６】
【発明の効果】
以上説明したとおり、本発明に係る位置検出装置、位置検出方法及び位置検出プログラムでは、以下に示す優れた効果を奏する。
【０１７７】
請求項１、請求項４又は請求項５に記載の発明によれば、位置指定装置から照射されるスリット状の拡散光によって、可視光のビーム光によって指示された画面上の位置を検出することができる。これによって、操作者は、画像表示装置において画面上の位置を直接指定して操作を行うことができるため、操作性に優れたユーザインタフェースを提供することができる。
【０１７９】
請求項２又は請求項３に記載の発明によれば、フォトディテクタ等の光検出手段を、既存の投射型ディスプレイ、ＣＲＴモニタ、液晶モニタ、プラズマディスプレイ、ＥＬディスプレイ等の表示装置の表示領域外に配置するという簡単な構成で画像表示装置を実現することができるため、低コストで画像表示装置を製作することができる。
【図面の簡単な説明】
【図１】本発明の第一の実施の形態に係る位置指定装置及び位置検出装置を含んだ画像表示システムの構成を示した概略図である。
【図２】本発明の第一の実施の形態に係る位置指定装置の構成を示すブロック図である。
【図３】本発明の第一の実施の形態に係る位置検出装置の構成を示すブロック図である。
【図４】光検出器を画面の左右の表示領域外に配置したときの、指定位置を算出する方法を説明するための説明図である。
【図５】光検出器を画面の一方（左側）の表示領域外に並列に配置したときの、指定位置を算出する方法を説明するための説明図である。
【図６】本発明の第一の実施の形態に係る位置指定装置及び位置検出装置を含んだ画像表示システムの動作を示すフローチャートである。
【図７】 参考例である第二の実施の形態に係る位置指定装置及び位置検出装置を含んだ画像表示システムの構成を示した概略図である。
【図８】本発明の第二の実施の形態に係る位置指定装置の構成を示すブロック図である。
【図９】光検出器を画面の上下左右の表示領域外に配置したときの、指定位置を算出する方法を説明するための説明図である。
【図１０】光検出器を画面の左側及び下側の表示領域外にそれぞれ並列に配置したときの、指定位置を算出する方法を説明するための説明図である。
【図１１】本発明の第二の実施の形態に係る位置指定装置及び位置検出装置を含んだ画像表示システムの動作を示すフローチャートである。
【図１２】 参考例である第三の実施の形態に係る位置指定装置及び位置検出装置を含んだ画像表示システムの構成を示した概略図である。
【図１３】本発明の第三の実施の形態に係る位置指定装置の構成を示すブロック図である。
【図１４】本発明の第三の実施の形態に係る位置検出装置の構成を示すブロック図である。
【図１５】照射位置及び位相に基づいて、光検出器から位相指定装置までの距離を算出する方法を説明するための説明図である。
【図１６】本発明の第四の実施の形態に係る位置検出装置の構成を示すブロック図である。
【図１７】本発明の第五の実施の形態に係る位置検出装置の構成を示すブロック図である。
【図１８】光検出器から位置指定装置までの距離を算出する方法を説明するための説明図である。
【図１９】（ａ）本発明の位置指定装置及び位置検出装置をテレビ受像機に適用した場合の例を示す図である。
（ｂ）本発明の位置指定装置をメガネに適用した場合の例を示す図である。
【図２０】（ａ）本発明の位置指定装置を適用するバーチャルスコープの全体図である。（ｂ）本発明の位置指定装置を適用したバーチャルスコープの動作の概念を示す概念図である。
【符号の説明】
１、１Ｂ、１Ｃ ……画像表示システム
２、２Ｂ、２Ｃ ……リモコン装置
３、３Ｂ、３Ｃ ……画像表示装置
１０、１０Ｂ、１０Ｃ ……位置指定装置
１１ ……第一光投射手段
１２、１２Ｃ ……第二光投射手段
１３ ……光合成投射手段
１４ ……強度変調手段
２０、２０Ｂ、２０Ｃ、２０Ｄ、２０Ｅ……位置検出装置
２１ ……光検出器アレイ
２２ ……光検出器（光検出手段）
２３、２３Ｂ、２３Ｃ、２３Ｄ、２３Ｅ……光信号検出処理手段
２４、２４Ｂ、２４Ｃ ……照射位置検出部（照射位置検出手段）
２４ａ ……光強度測定部（光強度測定手段）
２４ｂ ……位相検出部（位相検出手段）
２５、２５Ｂ、２５Ｃ ……指示位置算出部（指示位置算出手段）
２６、２６Ｅ ……光電変換部
２７ ……信号抽出部
３０ ……表示装置
４０ ……画像表示制御装置[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a position designation device for remotely pointing an image on a screen or a part of a menu screen in an image display device, a position detection device for detecting a designated position on the screen pointed to by the position designation device, and a position The present invention relates to a detection method and a position detection program.
[0002]
[Prior art]
In recent years, with the spread of digital broadcasting, information required by viewers has been subdivided, and an environment for requesting the subdivided information individually and providing information for the request has been developed. In addition, with the progress of bidirectional communication, there is an increasing demand for selecting a part of a video on the screen and providing detailed information related to the selected video.
In such an environment, for example, in television operations, operations such as switching channels by remote control operations and selecting menu screen buttons with up, down, left, and right arrow keys are performed. However, this remote control operation cannot point to an arbitrary position on the screen.
[0003]
Therefore, conventionally, a screen output from a computer is projected onto a screen by a projector device, the screen is shot with an infrared camera, and an operator designates a desired position on the screen with an infrared ray using a laser pointer. There is a technique for detecting a position indicated by an operator on a screen from a photographed image (see, for example, Patent Document 1).
Also, there is a technique in which an optical sensor is provided for each pixel of the screen of the image display device, and the operator detects a desired position by the optical sensor by pointing an arbitrary position on the screen with the laser beam of the remote controller. Exists (for example, refer to Patent Document 2).
[0004]
[Patent Document 1]
JP-A-6-242848 (paragraph number 6-13, Fig. 1-3)
[Patent Document 2]
Japanese Patent Laid-Open No. 2001-175413 (paragraph numbers 12-43, FIGS. 1-4)
[0005]
[Problems to be solved by the invention]
In the above-described conventional technology, in the technology in which the position pointed to by infrared rays on the screen is detected by the infrared camera, it is necessary to shoot the screen with the (infrared) camera. There is a problem that the installation adjustment is complicated. Furthermore, there is a problem that it cannot be used in a general home because the entire apparatus becomes large with the installation of the camera.
[0006]
In addition, in the technology for detecting the laser beam of the remote controller by providing an optical sensor for each pixel of the screen of the image display device, it is necessary to manufacture a display having an optical sensor for each pixel, so the manufacturing cost of the display itself is high. There is a problem of becoming. Furthermore, there is a problem that the finer the pixel size, the finer the optical sensor must be processed, making it difficult to construct a high-definition display.
[0007]
The present invention has been made in view of the above-described problems, and it is possible to designate an arbitrary position on the screen and detect the position on various displays that are currently widely used. An object is to provide a position detection device, a position detection method, a position detection program, and a position designation device.
[0008]
[Means for Solving the Problems]
The present invention has been developed to achieve the above object. First, the position detection device according to claim 1 is configured such that the position designation device indicates an arbitrary position on a screen by a position indication light. A position detection device that detects an indication position on a screen indicated by the position indication light by being irradiated with slit diffused light that is diffused in a slit shape with the indication light as a center. A plurality of light detecting means for detecting the slit diffused light, a light intensity measuring means for measuring the light intensity of the slit diffused light detected by the light detecting means, and the light detecting the slit diffused light An irradiation position detection means for detecting an irradiation position of the detection means, an irradiation position of the light detection means detected by the irradiation position detection means, and a light intensity of the slit diffused light measured by the light intensity measurement means Based on, and configured to and a pointed position calculation means for calculating the indicated position.
[0009]
According to such a configuration, the position detection device detects the slit-shaped diffused light (slit diffused light) emitted from the position specifying device by a plurality of light detection means arranged outside the display area of the screen. This slit diffused light is line illumination light that irradiates a line, and has a light intensity distribution in which the light intensity differs between the center and the periphery. Note that the line width when the slit diffused light is irradiated on the screen may be a width that can identify the light detection means arranged outside the display area of the screen.
[0010]
Further, the position detection device measures the light intensity of the slit diffused light detected by each light detection means by the light intensity measurement means, and the position of the light detection means irradiated with the slit diffused light by the irradiation position detection means ( (Irradiation position) is detected. The irradiation positions are two points irradiated with slit diffused light outside the display area of the screen.
[0011]
Instructed by the position specifying device based on the irradiation position of the light detection means detected by the irradiation position detection means and the light intensity of the slit diffused light measured by the light intensity measurement means by the indicated position calculation means The indicated position on the screen is calculated. At this time, since the slit diffused light has a light intensity distribution in which the light intensity is different between the center and the periphery, the slit diffused light is determined based on the two irradiation positions irradiated with the slit diffused light and the light intensity. The center of the light, that is, the indicated position indicated by the position indicating light can be calculated.
[0012]
The position indicating light is visible light (wavelength is about 380 nm to about 780 nm) visible to the operator, and the slit diffused light is preferably invisible light having a wavelength outside the wavelength range of visible light. As a result, the operator can confirm only the position he / she wishes to indicate with the position indicating light.
[0017]
  Also,Claim 2The position detection device described inClaim 1In the described position detection device, the light detection means is arranged in a line on each of the left and right and / or top and bottom of the screen outside the display area of the image display device.
[0018]
According to such a configuration, the position detection device is configured by arranging the light detection means in a line on each of the left and right and / or top and bottom of the screen outside the display area of the image display device. Thereby, for example, when the light detection means are arranged in a line on the left and right of the screen, the slit diffused light diffused in the horizontal direction can be specified by the light detection means arranged on the left side and the light detection means arranged on the right side. . Further, when the light detection means are arranged in a line at the top, bottom, left and right of the screen, the slit diffused light diffused in a cross shape can be specified by each light detection means.
[0019]
  further,Claim 3The position detection device described inClaim 1In the described position detection apparatus, the light detection means is arranged in parallel at least at one place on the left side, right side, upper part, or lower part of the screen outside the display area of the image display apparatus.
[0020]
According to such a configuration, the position detection device is configured by arranging the light detection means in parallel at least at one place on the left side, the right side, the upper portion, or the lower portion of the screen outside the display area of the image display device. Thereby, for example, when two rows of light detection means are arranged in parallel on the left side of the screen, the slit diffused light diffused in the horizontal direction is specified by the positions of the two light detection means detected in each row. Can do.
[0021]
  Also,Claim 4In the position detection method described in the above, the position indication device irradiates a slit diffused light diffused in a slit shape with the position indication light as a center from a position designation device that indicates an arbitrary position on the screen with a position indication light. A position detection method for detecting an indicated position on a screen pointed to by light, a light projection step of projecting the slit diffused light onto the screen from the position designation device, and projecting in this light projection step A light detection step of detecting the slit diffused light by a plurality of light detection means arranged outside the display area of the screen, and a light intensity measurement means for calculating the light intensity of the slit diffusion light detected in the light detection step. An irradiation position detecting step for measuring and detecting an irradiation position of the light detecting means irradiated with the slit diffused light, and the light detection detected in the irradiation position detecting step. An irradiation position of the means, based on the light intensity of the measured by the light intensity measuring means and the slit diffused light, characterized in that it comprises a and a pointed position calculation step of calculating the indicated position.
[0022]
  According to this method, in the light detection step, the position detection method projects the slit diffused light diffused in a slit shape around the designated position from the position designation device onto the screen. And detect the slit diffused light in the light detection step,further,In the irradiation position detection stepMeasure the light intensity of the slit diffused light detected in the light detection step by the light intensity measuring means,The irradiation position of the light detection means irradiated with the slit diffused light is detected. And the irradiation position of the light detection means in the indicated position calculation stepAnd the light intensity of the slit diffused light measured by the light intensity measuring meansBased on the above, the indicated position is calculated.
[0023]
In this indicated position calculation step, the center of the slit diffused light, that is, the indicated position may be calculated based on the light intensity of the slit diffused light at the irradiation position of the light detection means, or a plurality of slit diffused lights are irradiated. In some cases, the indicated position may be calculated as the intersection of the slit diffused light.
[0024]
  further,Claim 5The position detection program described in the above is directed to the position indication by irradiating slit diffused light diffused in a slit shape with the position indication light as a center from a position designation device that indicates an arbitrary position on the screen with position indication light. In order to detect the indicated position on the screen indicated by light, the computer is configured to function by the following means.
[0025]
  That is, by a plurality of light detection means arranged outside the display area of the screen.DetectedSlit diffused lightBased on the light intensity of the light, the irradiation position of the light detection means that detected the slit diffused light is determined.Irradiation position detection means to detect, irradiation position detected by this irradiation position detection meansAnd the light intensity of the slit diffused lightThe indicated position calculating means for calculating the indicated position based on
[0026]
  According to this configuration, the position detection program detects the irradiation position of the light detection means that has detected the slit diffused light by the irradiation position detection means.Based on light intensityTo detect. And by the indicated position calculation means, the irradiation position of the light detection meansAnd the light intensity of the diffused lightFrom this, the indicated position is calculated.
  In the indicated position calculating means, the center of the slit diffused light, that is, the indicated position may be calculated based on the light intensity of the slit diffused light at the irradiation position of the light detecting means, or a plurality of slit diffused lights are irradiated. In some cases, the indicated position may be calculated as the intersection of the slit diffused light.
[0034]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[First embodiment]
FIG. 1 is a schematic diagram showing a configuration of an image display system 1 including a position designation device 10 and a position detection device 20 according to the first embodiment of the present invention. As shown in FIG. 1, the image display system 1 includes a remote control device 2 provided with a position specifying device 10, a position detection device provided with a light detector array 21 in which a plurality of light detectors 22 are arranged and a light signal detection processing means 23. 20, a display device 30 and an image display control device 40. The image display device 3 includes a position detection device 20, a display device 30, and an image display control device 40.
[0035]
In the image display system 1, the position detection device 20 irradiates the designated position T on the screen of the display device 30 indicated by the visible light beam B emitted from the remote control device 2 simultaneously with the beam B. It is calculated from the probe light (slit diffused light) P, and image display is controlled based on the designated position T.
[0036]
The remote control device 2 includes a position specifying device 10, indicating an arbitrary position on the screen of the display device 30, and an operator instructing the image display device 3 to perform an operation. This position designation device 10 projects visible light beam B and probe light P, which is slit-shaped diffused light centered on the light beam B.
[0037]
The image display device 3 includes a position detection device 20, a display device 30, and an image display control device 40, and the operator points to the beam light B of the remote control device 2 based on the probe light P emitted from the remote control device 2. While detecting a position, the image which an operator desires is displayed.
[0038]
The position detection device 20 includes a photodetector array 21 in which a plurality of photodetectors 22 are arranged outside the left and right display areas of the display device 30 and an optical signal detection processing unit 23, and probe light emitted from the remote control device 2. On the basis of P, the operator detects a designated position T on the screen indicated by the light beam B of the remote control device 2.
[0039]
The display device 30 is a display that displays television images, personal computer screens, and the like. For example, a projection display, a CRT monitor, a liquid crystal monitor, a plasma display, an EL display, and the like.
[0040]
The image display control device 40 controls the display of the screen based on the designated position T on the screen of the display device 30 detected by the position detection device 20. For example, with a computer such as a personal computer, a data broadcasting receiver, etc., by selecting an icon, a button on the menu screen, etc., displaying a different screen or selecting a specific size area, A user interface process such as enlarging and displaying the screen of the area is performed.
[0041]
(Configuration of position specifying device 10)
Next, the configuration of the position specifying device 10 in the remote control device 2 in the image display system 1 according to the first embodiment will be described with reference to FIG. 2 (refer to FIG. 1 as appropriate). FIG. 2 is a block diagram illustrating a configuration of the position specifying device 10. As shown in FIG. 2, the position specifying device 10 includes a first light projection unit 11, a second light projection unit 12, and a light combining projection unit 13.
[0042]
The 1st light projection means 11 is provided with the 1st light source part 11a, and outputs the beam light (position indication light) B of a visible wavelength region. The first light source unit 11a is a laser diode, a light emitting diode, or the like, for example, and outputs light in a specific visible wavelength region. The light beam B output from the first light source unit 11 a is input to the light combining and projecting unit 13.
[0043]
The second light projection unit 12 includes a second light source unit 12a and a waveform shaping unit 12b, and outputs probe light (slit diffused light) P that spreads in a slit shape with different light intensities in the center and the periphery in the invisible wavelength region. Is.
[0044]
The second light source unit 12a is a light source that outputs invisible light. The second light source unit 12a is, for example, a laser diode or a light emitting diode, and outputs invisible light such as infrared rays. The light output from the second light source unit 11a is input to the waveform shaping unit 12b.
[0045]
The waveform shaping unit 12b shapes the waveform of invisible light output from the second light source unit 12a into slit-shaped light (slit diffused light). For example, a cylindrical lens or a hologram diffractive optical element can be used for the waveform shaping unit 12b. In addition, this waveform shaping part 12b shall diffuse a slit diffused light in a horizontal (horizontal) direction. The probe light P diffused in a slit shape by the waveform shaping unit 12 b is output to the light combining projection unit 13.
[0046]
The light combining and projecting unit 13 projects the beam light (position indicating light) B output from the first light projecting unit 11 and the probe light P output from the waveform shaping unit 12b in the same direction around the beam light B. To do. For example, the light combining and projecting means 13 is composed of a dichroic mirror 13a, reflects only the light output from the first light projecting means 11 by changing the direction by 90 °, and the light output from the second light projecting means 12 is left as it is. By passing the light, the probe light P and the beam light B can be output in the same direction.
[0047]
Note that the dichroic mirror 13a reflects only light in a specific wavelength region, and here, only light in the visible wavelength region output from the first light projection unit 11 is reflected.
[0048]
By providing the respec device 2 with the position specifying device 10 configured as described above, the operator can visually recognize the position indicated by the beam light B on the screen, and can directly specify the position desired by the operator. Can do. The position specifying device 10 is preferably configured to transmit or stop the beam light B and the probe light P by a projection button (not shown) of the recommon device 2.
[0049]
Further, the position designating device 10 projects the probe light P simultaneously with the beam light B, so that the position detection device 20 can detect the position on the screen indicated by the beam light B from the probe light P. become. A method of detecting the position on the screen indicated by the beam light B from the probe light P will be described later.
[0050]
In the re-common device 2, when a screen operation is performed with a decision button or the like, infrared pulse signal string data is transmitted as in the conventional remote control device. Alternatively, infrared light having a wavelength different from that of the probe light P may be transmitted, and the infrared light may be received as an operation control signal on the image display device 3 side.
[0051]
(Configuration of the position detection device 20)
Next, the configuration of the position detection device 20 in the image display device 3 in the image display system 1 according to the first embodiment will be described with reference to FIG. 3 (refer to FIG. 1 as appropriate). FIG. 3 is a block diagram illustrating a configuration of the position detection device 20. As shown in FIG. 3, the position detection device 20 includes a photodetector array 21 in which photodetectors 22 are arranged, and an optical signal detection processing unit 23 including an irradiation position detection unit 24 and an indicated position calculation unit 25. Configured.
[0052]
The photodetector array 21 has a plurality of photodetectors 22 arranged in a row, and detects the probe light (slit diffused light) P emitted from the position specifying device 10. Here, one photodetector array 21 in which the photodetectors 22 are arranged in a row is illustrated, but actually, it is provided outside the left and right display areas of the display device 30. Although not shown, it is desirable to arrange an optical filter that transmits only light in the wavelength region of the probe light P on the front surface (light receiving side) of the photodetector array 21. Thereby, the influence of outside light other than the probe light P can be suppressed.
[0053]
  The photodetector (light detection means) 22 detects the probe light P and converts it into an electrical signal. For example, a light receiving element such as a photo detector can be used. Moreover, when using light with a wavelength of 500 nm to 900 nm as the probe light P, a GaAs photodiode is used. When using light with a wavelength (near infrared) of 900 nm to 1500 nm, an InGaAs photodiode is used. When using light of more than 1500 nm, photoelectric elements such as PbS, PbSe, InSb can be used. Here, the signal converted into the electric signal is the irradiation position of the optical signal detection processing means 23.detectionIs output to the unit 24.
[0054]
The optical signal detection processing unit 23 includes an irradiation position detection unit 24 and an indication position calculation unit 25, and the intensity (light) of the signal obtained by converting the probe light P input from the photodetector 22 of the photodetector array 21 into an electrical signal. The designated position T on the screen indicated by the light beam B of the remote controller 2 is calculated based on the intensity.
[0055]
The irradiation position detection unit (irradiation position detection unit) 24 includes a light intensity measurement unit (light intensity measurement unit) 24a, and which light detector 22 (22₁~ 22_N) Detects whether the probe light P is irradiated based on the light intensity. The light intensity measurement unit 24 a measures the intensity (light intensity) of the light emitted by each photodetector 22 based on the electrical signal input from the photodetector 22.
[0056]
The irradiation position detector 24 detects the irradiation position of the photodetector 22 having the highest light intensity for each photodetector array 21. The irradiation position and light intensity of the photodetector 22 are output to the indicated position calculation unit 25.
In the irradiation position detection unit 24, each light detector is used when the irradiated light straddles the adjacent photodetectors 22 and the light intensities detected by the adjacent photodetectors 22 are substantially equal. It is also possible to obtain the irradiation position based on the weighting and output it to the indicated position calculation unit 25 by weighting the 22 positions in advance according to the light intensity.
[0057]
The designated position calculation unit (designated position calculation means) 25 calculates a designated position T on the screen based on the irradiation position and light intensity of the photodetector 22 output from the irradiation position detection unit 24.
In the case where the irradiated light straddles the adjacent photodetectors 22 and the light intensities detected by the adjacent photodetectors 22 are substantially equal, the plurality of photodetectors 22 before and after the irradiation position are used. It is also possible to use the sum of the detected light intensities as the light intensity at the irradiation position.
[0058]
Here, with reference to FIG. 4 (refer to FIG. 3 as appropriate), a method in which the designated position calculation unit 25 calculates the designated position T based on the irradiation position and the light intensity of the photodetector 22 will be described. As shown in FIG. 4, it is assumed that the position specifying device 10 projects the beam light B and the probe light P onto the display device 30.
[0059]
Here, the photodetector having the highest light intensity in the individual photodetector arrays 21 arranged on the left and right of the display device 30 with the horizontal direction as the x-axis and the vertical direction as the y-axis with respect to the screen of the display device 30. The irradiation positions 22 are L (first irradiation position) and R (second irradiation position), and the coordinates of the first irradiation position L are (x₁, Y₁), The light intensity is I₁, The coordinates of the second irradiation position R are (x₂, Y₂), The light intensity is I₂Suppose that
At this time, the coordinates (x, y) of the designated position T pointed to by the light beam B exist on the straight line represented by the equation (1).
[0060]
y = {(y₂-Y₁) / (X₂-X₁)} X + y₁  ... (1)
[0061]
On the other hand, when the light intensity distribution is linearly different between the center and the periphery of the probe light P spread like a slit, α and β (α, β> 0) are known constants, and l is the center of the probe light P. The light intensity I is expressed by the equation (2).
[0062]
I = −αl + β (2)
[0063]
That is, the light intensity I at the first irradiation position L₁And the light intensity I at the second irradiation position R₂Are the equations (3) and (4), respectively.
[0064]
I₁= -Αl₁+ Β (3)
I₂= -Αl₂+ Β (4)
[0065]
In the indicated position calculation unit 25, the coordinates (x, y) of the designated position T are expressed as in the expressions (5) and (6) based on the above expressions (1), (3), and (4). Can be calculated.
[0066]
[Expression 1]

[0067]
[Expression 2]

[0068]
In the above equations (2), (3), and (4), α and β have been described as known constants. However, the operator uses the light beam B from the position specifying device 10 before starting the operation. For example, a specific location such as the center position of the screen is indicated, and the light intensity I of the first irradiation position L detected at that time is indicated.₁And the light intensity I at the second irradiation position R₂It is also possible to obtain α and β in advance by substituting into the equations (3) and (4).
[0069]
Β corresponds to the light intensity at the center (designated position T) of the probe light P. Therefore, the spread angle of the probe light P is φ, and the output light intensity of the light source (not shown) of the position specifying device 10 is β.₀If the distance from the position specifying device 10 to the screen of the display device 30 is d, β can be expressed by equation (7).
[0070]
[Equation 3]

[0071]
That is, the output light intensity β of the light source (not shown) of the position specifying device 10₀Is measured in advance, the distance d from the position specifying device 10 to the screen of the display device 30 can be calculated by the equation (8).
[0072]
[Expression 4]

[0073]
Further, the indicated position calculation unit 25 can also calculate the inclination θ of the probe light P, that is, the inclination θ of the position specifying device 10 with respect to the screen of the display device 30 by the equation (9).
[0074]
θ = tan^-1{(Y₂-Y₁) / (X₂-X₁)}… (9)
[0075]
Although the configuration of the image display system 1 has been described based on one embodiment, the present invention is not limited to this. For example, here, the photodetector array 21 in which the photodetectors 22 are arranged in a row is installed outside the left and right display areas of the display device 30, but may be installed outside the upper and lower display areas of the display device 30. . In this case, the waveform shaping unit 12b (FIG. 2) in the position specifying device 10 diffuses the probe light (slit diffused light) P in the vertical (longitudinal) direction.
[0076]
Further, the photodetector array 21 may have a configuration in which the photodetectors 22 are arranged in two rows outside any one display area on the top, bottom, left, and right of the display device 30.
For example, as shown in FIG. 5, two photodetector arrays 21 are arranged outside the display area on the left side of the display device 30 and the photodetectors 22 are arranged in parallel in two rows, and spread in a slit shape. When the probe light P has a light intensity distribution linearly different between the center and the periphery, α and β (α, β> 0) are known constants, and l is the center of the probe light P (designated position T). The light intensity I is expressed by the above equation (2).
[0077]
That is, the light intensity I at the first irradiation position L₁And the light intensity I at the second irradiation position R₂Are expressed in the same manner as the above-described equations (3) and (4).
Thereby, in the designated position calculation unit 25 (FIG. 3), the coordinates (x, y) of the designated position T are expressed by the expressions (10) and (11) based on the expressions (3) and (4). Can be calculated as follows.
[0078]
[Equation 5]

[0079]
[Formula 6]

[0080]
Note that α and β in the expressions (10) and (11) indicate a specific place such as the center position of the screen by the light beam B from the position specifying device 10 before the operator starts the operation, The light intensity I of the first irradiation position L detected at that time₁And the light intensity I at the second irradiation position R₂It is good also as calculating | requiring previously by substituting (3) and (4) in Formula.
[0081]
Further, the output light intensity of the light source (not shown) of the position specifying device 10 is expressed by β₀If the spread angle of the probe light P is φ, the distance d from the position specifying device 10 to the screen of the display device 30 can be calculated by the above equation (8). Furthermore, the inclination θ of the probe light P, that is, the inclination θ of the position specifying device 10 with respect to the screen of the display device 30 can be calculated by the above equation (9).
[0082]
(Operation of image display system 1)
Next, the operation of the image display system 1 will be described with reference to FIG. 1, FIG. 3, and FIG. FIG. 6 is a flowchart showing the operation of the image display system 1.
[0083]
<Light projection step>
First, the operator points the remote control device 2 toward the display device 30 and presses a projection button (not shown), whereby beam light (position indication light) B and probe light (slit diffusion light) are transmitted from the position designation device 10. P is projected onto the screen of the display device 30 (step S1). The beam light B is visible light that visually points to the designated position T on the screen desired by the operator, and the probe light P is a center used by the position detection device 20 to calculate the designated position T. It is slit-like invisible light having different light intensity distribution from the surroundings.
[0084]
<Light detection step>
Then, the photodetector 22 of the position detecting device 20 receives (detects) the probe light P projected from the position specifying device 10 (step S2). Here, it is assumed that the photodetectors 22 are arranged in a line as the photodetector array 21 outside the left and right display areas of the display device 30.
[0085]
<Irradiation position detection step>
Then, the light intensity measurement unit 24a of the position detection device 20 measures the light intensity (light intensity) of each probe 22 of the probe light P received in step S2 (step S3). By measuring the light intensity in the light detector 22, the irradiation position detector 24 detects the position of the light detector 22 having the highest light intensity for each light detector array 21 arranged on the left and right of the display device 30. (First irradiation position L and second irradiation position R) are specified as irradiation positions irradiated with probe light P (step S4).
[0086]
<Indicated position calculation step>
Based on the light intensity measured in step S3 and the irradiation position (first irradiation position L and second irradiation position R) of the photodetector 22 specified in step S4, the indication position calculation unit 25 displays the display device 30. The designated position T on the screen is calculated (step S5). The calculation of the designated position T is performed based on the above-described equations (5) and (6).
[0087]
<Image display step>
Based on the designated position T calculated in step S5, the image display control device 40 controls the display of the screen (step S6). For example, when the instructed position is a button on the menu screen, the operation is performed assuming that the button is selected.
[0088]
By projecting the visible light beam B projected from the position specifying device 10 directly on the screen through the above steps, the operator can directly indicate the position to be designated on the screen. The pointing device T pointed to by the operator can be detected by the detection device 20.
[0089]
In the indicated position calculation step (step S5), the distance from the position designation device 10 to the screen of the display device 30 and the inclination of the position designation device 10 with respect to the screen of the display device 30 are calculated, whereby the image display step (step In S6), various operations such as enlarging / reducing the image based on the distance of the position specifying device 10 and rotating the image based on the inclination of the position specifying device 10 can be performed.
[0090]
[Second Embodiment]
  Next, referring to FIG.Reference exampleAn image display system 1B including a position designation device 10B and a position detection device 20B according to the second embodiment will be described. FIG. 7 is a schematic diagram showing the configuration of the image display system 1B. As shown in FIG. 7, the image display system 1B includes a remote control device 2B having a position specifying device 10B, a photodetector array 21 in which a plurality of photodetectors 22 are arranged, and an optical signal detection processing means 23B. The apparatus 20B, the display apparatus 30, and the image display control apparatus 40 are comprised. The image display device 3B includes a position detection device 20B, a display device 30, and an image display control device 40.
[0091]
In the image display system 1B, the position detection device 20B irradiates the designated position T on the screen of the display device 30 indicated by the visible light beam B emitted from the remote control device 2B simultaneously with the beam B. It is calculated from the probe light (slit diffused light) P1 and P2, and the image display is controlled based on the designated position T.
[0092]
The remote control device 2B includes a position specifying device 10B. The remote control device 2B indicates an arbitrary position on the screen of the display device 30 and the operator instructs the image display device 3 to perform an operation. This position designation device 10 projects visible light beam B and probe lights P1 and P2 which are two slit-shaped diffused lights that intersect (cross) the beam light B as a center.
[0093]
As shown in FIG. 8, the position specifying device 10 </ b> B uses the waveform shaping unit 12 b of the position specifying device 10 (FIG. 2) as a waveform shaping unit 12 </ b> Bb whose function is changed so as to generate slit diffused light that crosses the cross. Can be realized. For example, the waveform shaping unit 12Bb optically distributes the light output from the second light source unit 12a and passes each light through two cylindrical lenses having different condensing directions, so that the slit-shaped diffused light is transmitted. And the two diffused light beams (slit diffused light) can be generated by projecting the optical axes of these two diffused light beams. Alternatively, it is possible to generate slit diffusion light crossed in a cross using a hologram diffractive optical element that shapes the input light as a cross interference fringe.
[0094]
The image display device 3B includes a position detection device 20B, a display device 30, and an image display control device 40, and the operator uses the beam light B of the remote control device 2B based on the probe lights P1 and P2 emitted from the remote control device 2B. While detecting the pointed position, an image desired by the operator is displayed. The display device 30 and the image display control device 40 are the same as those shown in FIG.
[0095]
The position detection device 20B includes a photodetector array 21 in which a plurality of photodetectors 22 are arranged outside the upper, lower, left, and right display areas of the display device 30 and an optical signal detection processing unit 23B, and a probe emitted from the remote control device 2B. Based on the lights P1 and P2, the operator detects a designated position T on the screen indicated by the beam light B of the remote controller 2B.
[0096]
The optical signal detection processing unit 23B will be described with reference to FIGS.
As shown in FIG. 3, the optical signal detection processing unit 23B is different from the irradiation position detection unit 24 and the designated position calculation unit 25 in the configuration of the optical signal detection processing unit 23. It is realizable by setting it as the calculation part 25B.
[0097]
The irradiation position detection unit 24 </ b> B detects the irradiation position of the photodetector 22 having the highest light intensity for each of the four photodetector arrays 21 installed outside the upper, lower, left, and right display areas of the display device 30. The irradiation position and light intensity of the photodetector 22 are output to the indicated position calculation unit 25B.
[0098]
The designated position calculation unit 25B calculates a designated position T on the screen based on the irradiation position of the photodetector 22 output from the irradiation position detection unit 24B. The indicated position calculation unit 25B is also for calculating the distance from the position designation device 10B to the screen of the display device 30 based on the light intensity of the photodetector 22 output from the irradiation position detection unit 24B.
[0099]
Here, with reference to FIG. 9 (refer to FIG. 3 as appropriate), a method of calculating the designated position T based on the position of the photodetector 22 where the designated position calculation unit 25B has received the probe lights P1 and P2 will be described. . As shown in FIG. 9, it is assumed that the position specifying device 10 </ b> B projects the beam light B and the probe lights P <b> 1 and P <b> 2 to the display device 30.
[0100]
Here, with respect to the screen of the display device 30, the horizontal direction is the x axis and the vertical direction is the y axis, and the light having the highest light intensity for each of the individual photodetector arrays 21 arranged above, below, left, and right of the display device 30. The irradiation position of the detector 22 is L (first irradiation position), R (second irradiation position), U (third irradiation position), and D (fourth irradiation position), and the coordinates of the first irradiation position L are (x₁, Y₁), The coordinates of the second irradiation position R are (x₂, Y₂), The coordinates of the third irradiation position U are (x_Three, Y_Three), The coordinates of the fourth irradiation position D are (x_Four, Y_Four).
[0101]
At this time, the coordinates (x, y) of the designated position T pointed to by the light beam B are the straight line connecting the first irradiation position L and the second irradiation position R shown in the equation (12), and (13 ) Is an intersection of a straight line connecting the third irradiation position U and the fourth irradiation position D shown by the equation.
[0102]
y = {(y₂-Y₁) / (X₂-X₁)} X + y₁− {(Y₂-Y₁) / (X₂-X₁)} X₁  (12)
y = {(y_Four-Y_Three) / (X_Four-X_Three)} X + y_Three− {(Y_Four-Y_Three) / (X_Four-X_Three)} X_Three  ... (13)
[0103]
That is, the coordinates (x, y) of the designated position T can be obtained by the equations (14) and (15).
[0104]
[Expression 7]

[0105]
[Equation 8]

[0106]
As described above, the position detection device 20B does not need to consider the light intensity distributions of the probe lights P1 and P2 in calculating the designated position T. Therefore, the position detection apparatus 20B is less susceptible to the influence of the disturbance, and increases the number of photodetectors 22. The accuracy of position detection can be increased.
[0107]
In addition, since the indicated position calculation unit 25B obtains the coordinates (x, y) of the designated position T by the above-described equations (14) and (15), the first irradiation position L and the designated position T are further determined. Distance l_LAnd the distance l between the second irradiation position R and the designated position T_RCan also be obtained by the equations (16) and (17).
[0108]
[Equation 9]

[0109]
[Expression 10]

[0110]
When the probe light P spread in a slit shape has light intensity distributions linearly different between the center and the periphery, α and β (α, β> 0) are known constants, and l is the center of the probe light P. Assuming that the distance from the (designated position T), the light intensity I is expressed by the above equation (2), and therefore the light intensity I at the first irradiation position L._LAnd the light intensity I at the second irradiation position R_RAre the equations (18) and (19), respectively. Note that β becomes the equation (20) from the equations (18) and (19).
[0111]
I_L= -Αl_L+ Β (18)
I_R= -Αl_R+ Β (19)
[0112]
[Expression 11]

[0113]
Here, the spread angle of the probe light P is φ, and the output light intensity of the light source (not shown) of the position specifying device 10B is β.₀When the distance from the position specifying device 10B to the screen of the display device 30 is d, β is expressed by the above equation (7), so the output light intensity β₀Is measured in advance, the distance d from the position specifying device 10B to the screen of the display device 30 can be calculated by the equation (21).
[0114]
[Expression 12]

[0115]
Note that the inclination of the position specifying device 10B with respect to the screen of the display device 30 can be calculated in the same manner as the method described in FIG.
[0116]
The configuration of the image display system 1B has been described above based on one embodiment, but the present invention is not limited to this. For example, here, the photodetector array 21 in which the photodetectors 22 are arranged in a row is installed outside the display area on the top, bottom, left, and right of the display device 30. It is good also as a structure which installs what arranged the photodetector 22 in parallel in 2 rows out of the area | region.
[0117]
For example, as shown in FIG. 10, in the configuration in which two photodetector arrays 21 are arranged outside the left and lower display areas of the display device 30 and the photodetectors 22 are arranged in parallel in two rows. As the intersection of the straight line connecting the first irradiation position L and the second irradiation position R and the straight line connecting the third irradiation position U and the fourth irradiation position D, the above-described equations (14) and (15) The indicated position T can be calculated by the equation.
[0118]
Further, the distance l between the first irradiation position L and the specified position T_LAnd the distance l between the second irradiation position R and the designated position T_RCan also be calculated by the above-described equations (16) and (17).
[0119]
Further, when the probe light P spreading in a slit shape has a light intensity distribution linearly different between the center and the periphery, the spread angle of the probe light P is φ, and the output of the light source (not shown) of the position specifying device 10B. The light intensity is β₀When the distance from the position specifying device 10B to the screen of the display device 30 is d, β is expressed by the above equation (7), so the output light intensity β₀Is measured in advance, the distance d from the position specifying device 10B to the screen of the display device 30 can be calculated by the above-described equation (8). Note that the inclination of the position specifying device 10B with respect to the screen of the display device 30 can be calculated in the same manner as the method described in FIG.
[0120]
(Operation of image display system 1B)
Next, the operation of the image display system 1B will be described with reference to FIG. 3, FIG. 7, and FIG. FIG. 11 is a flowchart showing the operation of the image display system 1B.
[0121]
<Light projection step>
First, the operator points the remote control device 2B toward the display device 30 and presses a projection button (not shown), so that the probe light (crossed in a cross with the beam light (position indication light) B from the position designation device 10B) ( (Slit diffused light) P1 and P2 are projected onto the screen of the display device 30 (step S11).
[0122]
<Light detection step>
Then, the photodetector 22 of the position detecting device 20B receives (detects) the probe lights P1 and P2 projected from the position specifying device 10B (step S12). Here, it is assumed that the photodetectors 22 are arranged in a row as the photodetector array 21 outside the display area on the top, bottom, left, and right of the display device 30.
[0123]
<Irradiation position detection step>
Then, the light intensity measuring unit 24a of the position detection device 20B measures the light intensity (light intensity) of the probe light P1 and P2 received in step S12 in each photodetector 22 (step S13). By measuring the light intensity in the light detector 22, the irradiation position detection unit 24 </ b> B has the light intensity of the light detector 22 with the highest light intensity for each light detector array 21 arranged at the top, bottom, left and right of the display device 30. The positions (first irradiation position L, second irradiation position R, third irradiation position U, and fourth irradiation position D) are specified as the irradiation positions irradiated with the probe lights P1 and P2 (step S14).
[0124]
<Indicated position calculation step>
The designated position calculation unit 25B then connects the first irradiation position L and the second irradiation position R, which are the irradiation positions of the photodetector 22 identified in step S14, and the third irradiation position U and the fourth irradiation position. The intersection point with the straight line connecting the irradiation position D is calculated as the designated position T on the screen of the display device 30 (step S15). The calculation of the designated position T is performed based on the above-described equations (14) and (15).
[0125]
<Image display step>
Based on the designated position T calculated in step S15, the image display control device 40 controls the display of the screen (step S16). For example, when the instructed position is a button on the menu screen, the operation is performed assuming that the button is selected.
[0126]
  [Third embodiment]
  Next, referring to FIG.Reference exampleAn image display system 1C including a position designation device 10C and a position detection device 20C according to a third embodiment will be described. FIG. 12 is a schematic diagram showing the configuration of the image display system 1C. As shown in FIG. 12, the image display system 1C includes a remote control device 2C including a position specifying device 10C, a photodetector array 21 in which a plurality of photodetectors 22 are arranged, and an optical signal detection processing unit 23C. The apparatus 20C, the display apparatus 30, and the image display control apparatus 40 are configured. The image display device 3 </ b> C includes a position detection device 20 </ b> C, a display device 30, and an image display control device 40.
[0127]
In the image display system 1C, the position detection device 20C irradiates the designated position T on the screen of the display device 30 indicated by the visible light beam B emitted from the remote controller 2C simultaneously with the beam B. It is calculated from the probe light (slit diffused light) P1 and P2, and the image display is controlled based on the designated position T. The display device 30 and the image display control device 40 are the same as those shown in FIG.
[0128]
(Configuration of position specifying device 10C)
Here, with reference to FIG. 13 (refer to FIG. 12 as appropriate), the configuration of the position specifying device 10C in the remote control device 2C in the image display system 1C according to the third embodiment will be described. FIG. 13 is a block diagram illustrating a configuration of the position specifying device 10C. As shown in FIG. 13, the position specifying device 10 </ b> C includes a first light projection unit 11, a second light projection unit 12 </ b> C, a light combining projection unit 13, and an intensity modulation unit 14. The first light emitting means 11 and the light combining and projecting means 13 are the same as those described in FIG. 2, and the waveform shaping unit 12Bb of the second light emitting means 12C is the same as that described in FIG. Then, explanation is omitted.
[0129]
The second light source unit 12Ca is a light source that outputs invisible light in which the light intensity is changed with time based on an intensity modulation signal output from the intensity modulation unit 14 described later. This 2nd light source part 12Ca shall output invisible light, such as infrared rays, with a laser diode, a light emitting diode, etc., for example. The invisible light output from the second light source unit 12Ca is input to the waveform shaping unit 12Bb.
[0130]
The intensity modulation means 14 generates intensity modulation signals having different strengths with time. For example, an intensity signal corresponding to the phase of the sine wave (intensity modulation signal) is generated by a known sine wave generation circuit or the like. The intensity modulation signal generated here is input to the second light source unit 12Ca.
By configuring the position specifying device 10C in this way, the phases of the probe lights P1 and P2 can be changed.
[0131]
(Configuration of Position Detection Device 20C)
  Next, the configuration of the position detection device 20C in the image display device 3C in the image display system 1C according to the third embodiment will be described with reference to FIG. 14 (see FIG. 12 as appropriate). FIG. 14 is a block diagram illustrating a configuration of the position detection device 20C. As shown in FIG. 14, the position detection device 20C includes a photodetector array 21 in which photodetectors 22 are arranged, and an optical signal detection processing unit 23C including an irradiation position detection unit 24C and an indicated position calculation unit 25C. Configured. Phase detector 24b and indicated position calculationPartSince the configuration other than 25C is the same as that of FIG. 3, the same reference numerals are given and the description thereof is omitted.
[0132]
The phase detection unit (phase detection means) 24b detects the phases of the probe lights P1 and P2 detected by the photodetector 22. In the phase detector 24b, the phase of the signal detected by the photodetector 22 having the highest light intensity is detected for each photodetector array 21 by the light intensity measuring unit 24a. For example, in FIG. 12, the phase of the signal at the first irradiation position L, the second irradiation position R, the third irradiation position U, and the fourth irradiation position D irradiated with the probe lights P1 and P2 is detected. The phase detected here is output to the indicated position calculation unit 25C.
[0133]
Based on the irradiation position of the photodetector 22 output from the irradiation position detection unit 24C and the phase of the irradiation position detected by the phase detection unit 24b, the instruction position calculation unit (instruction position calculation means) 25C is displayed on the screen. The designated position T and the position of the position designation device 10C are calculated.
[0134]
Here, referring to FIG. 15 (refer to FIG. 14 as appropriate), the indicated position calculation unit 25C determines the position (three-dimensional position) of the position specifying device 10C based on the irradiation position of the photodetector 22 and the phase at the irradiation position. A method for calculating the value will be described.
[0135]
Here, the horizontal direction with respect to the screen of the display device 30 is the x axis, the vertical direction is the y axis, and the vertical direction with respect to the xy plane is the d axis. The irradiation position of the photodetector 22 having the highest light intensity for each of the detector arrays 21 is L (first irradiation position), R (second irradiation position), U (third irradiation position), and D (fourth irradiation position). And each coordinate is (x₁, Y₁), (X₂, Y₂), (X_Three, Y_Three) And (x_Four, Y_Four). Furthermore, the detected phase at each irradiation position (L, R, U and D) is θ₁, Θ₂, Θ_ThreeAnd θ_FourSuppose that
[0136]
At this time, distances d1, d2, d3, and d4 from the respective irradiation positions (L, R, U, and D) to the position specifying device 10C are obtained by the following equations (22) to (25). Here, c is the speed of light, and f is the intensity modulation frequency of the probe lights P1 and P2.
[0137]
d₁= Θ₁C / (2πf) (22)
d₂= Θ₂C / (2πf) (23)
d_Three= Θ_ThreeC / (2πf) (24)
d_Four= Θ_FourC / (2πf) (25)
[0138]
Further, the position of the position specifying device 10C is set to O (x₀, Y₀, D₀), The following relationships (26) to (29) are established.
[0139]
(X₀-X₁)²+ (Y₀-Y₁)²+ D₀ ²= D₁ ²  ... (26)
(X₀-X₂)²+ (Y₀-Y₂)²+ D₀ ²= D₂ ²  ... (27)
(X₀-X_Three)²+ (Y₀-Y_Three)²+ D₀ ²= D_Three ²  ... (28)
(X₀-X_Four)²+ (Y₀-Y_Four)²+ D₀ ²= D_Four ²  ... (29)
[0140]
In the indicated position calculation unit 25C, the position O (x) of the position specifying device 10C is based on the above-described equations (26) to (29).₀, Y₀, D₀) Can be calculated by equations (30) to (32).
[0141]
[Formula 13]

[0142]
[Expression 14]

[0143]
[Expression 15]

[0144]
Note that the specified position T and the inclination of the position specifying device 10C with respect to the screen of the display device 30 can be calculated by the method described with reference to FIGS.
[0145]
As described above, the position detection device 20C can determine the position O of the position specifying device 10C without considering the light intensity distributions of the probe lights P1 and P2, which are slit-like diffused light. Thus, since the position detection device 20C does not use a light intensity distribution that is easily changed by external light or the like, the position O of the position designation device 10C can be obtained with high accuracy.
[0146]
Further, since the position detection device 20C can detect the three-dimensional position of the position specification device 10C, the position detection device 20C responds to the back-and-forth, right-and-left or up-and-down movement of the remote control device 2C (FIG. 12) including the position specification device 10C. An application such as switching an image displayed on the screen of the display device 30 can be easily constructed.
[0147]
[Fourth embodiment]
Next, with reference to FIG. 16, the structure of the position detection apparatus 20D according to the fourth embodiment of the present invention will be described. In the first to third embodiments (FIGS. 1, 7, and 12) described above, the photodetector 22 uses a light receiving element such as a photodetector that detects light and converts it into an electrical signal. Although described, a microlens may be used. FIG. 16 is a block diagram showing a configuration of a position detection device 20D using a microlens.
[0148]
  As shown in FIG. 16, the position detection device 20D includes an optical signal detection processing unit 23D including a microlens array 21B in which microlenses 22B are arranged, an irradiation position detection unit 24, an indicated position calculation unit 25, and a photoelectric conversion unit 26. And configured. Irradiation position detection unit 24 and instruction position calculationPart25 is the same as that described in FIG.
[0149]
The microlens array 21B has a plurality of microlenses 22B arranged in a row, and detects probe light (slit diffused light) emitted from the position specifying device 10 (10B, 10C) (FIGS. 1, 7, and 12). Is.
[0150]
The microlens 22B is a minute lens having a size of about several μm to several mm, and plays a role as a light detection means for detecting light. The light received by the micro lens 22B is input to the photoelectric conversion unit 26 via the optical fiber F.
[0151]
The photoelectric conversion unit 26 includes a linear sensor, a two-dimensional sensor, and the like, and converts an optical signal input via the optical fiber F into an electrical signal. For example, a one-dimensional sensor (CCD line sensor) using an existing CCD, a two-dimensional sensor (CCD area sensor), or the like can be used. In particular, when a two-dimensional sensor is used, the irradiation position detection unit 24 and the designated position calculation unit 25 may regard the signal received and converted into an electrical signal as a two-dimensional image, and specify the irradiation position and the designated position. it can.
As described above, the position detection device 20D can be constructed at low cost because an existing one-dimensional sensor or two-dimensional sensor such as a CCD can be used.
[0152]
[Fifth embodiment]
Next, with reference to FIG. 17, the structure of the position detection apparatus 20E which concerns on 5th embodiment in this invention is demonstrated. In the above-described fourth embodiment (FIG. 16), an example in which an existing one-dimensional sensor such as a CCD or a two-dimensional sensor is used as the photoelectric conversion unit 26 has been described. It is also possible to use a sensor (for example, a storage type CCD). In this case, since the exposure time is long in the accumulation type CCD or the like, the phase of the intensity-modulated probe light output from the position specifying device 10C described with reference to FIG. 13 cannot be detected.
[0153]
Therefore, as shown in FIG. 17, the position detection device 20E includes a microlens array 21B in which microlenses 22B are arranged, an irradiation position detection unit 24, an indicated position calculation unit 25, a photoelectric conversion unit 26E, and a signal extraction unit 27. The optical signal detection processing means 23E included is included. Since the configuration other than the photoelectric conversion unit 26E and the signal extraction unit 27 is the same as that in FIG. 3, the same reference numerals are given and description thereof is omitted.
[0154]
The photoelectric conversion unit 26E is configured by a storage type two-dimensional sensor or the like, and converts an optical signal into an electric signal. Since the photoelectric conversion unit 26E can increase the exposure time by using, for example, a storage CCD, the sensitivity can be increased by increasing the amount of received light.
[0155]
The signal extraction unit 27 samples (extracts) an optical signal input via the optical fiber F at specific time intervals. The signal extraction unit 27 can use, for example, an image intensifier with a high-speed gate as a light speed sampling element.
[0156]
Here, with reference to FIG. 18 (refer to FIGS. 13 and 17 as appropriate), a method of calculating the distance from the photodetector (microlens 22B) to the position specifying device 10C by the position detection device 20E will be described. FIG. 18 is a graph showing the relationship between the time of the intensity-modulated probe light irradiated from the position specifying device 10C and the light intensity (light reception intensity). I indicates the maximum received light intensity, and T indicates the period.
[0157]
The distance from the micro lens 22B to the position specifying device 10C is d, and the light receiving intensity of the probe light received by the micro lens 22B is I._d, The received light intensity I at a certain time t_dIs represented by the equation (33). Note that f represents the intensity modulation frequency and c represents the speed of light.
[0158]
I_d= I · sin²{2πf (t + d / c)} (33)
[0159]
Here, the first sampling time of the signal extraction unit 27 is t₁, The second sampling time is t₂= T₁+ T / 2. At this time, the first sampling time t₁And the second sampling time t₂Received light intensity I₁And I₂Can be expressed by equations (34) and (35).
[0160]

[0161]
Further, the maximum received light intensity I can be obtained from the equation (36).
[0162]
I = I₁+ I₂  ... (36)
[0163]
Further, the distance d from the micro lens 22B to the position specifying device 10C can be calculated by the equation (37).
[0164]
I₁/ I₂= Tan²{2πf (t₁+ D / c)} (37)
[0165]
As described above, since the position detection device 20E does not use a light intensity distribution that is easily changed by external light or the like, the position of the position specifying device 10C can be obtained with high accuracy. Furthermore, since a storage type CCD can be used as the photoelectric conversion unit 26E, the light receiving sensitivity can be increased.
[0166]
[Usage example of position specifying device and position detecting device]
Next, with reference to FIG. 19 and FIG. 20, a usage example of the position specifying device and the position detecting device according to the present invention will be described.
FIG. 19 is a diagram illustrating an example in which the present invention is applied to a television receiver, a computer display, and the like. FIG. 19A shows an image display device 3 (television receiver, computer display) provided with a position detection device (not shown) by an operator M using a remote control device 2 provided with a position designation device (not shown). And so on). FIG. 19B is a schematic diagram showing a state where the operator M is operating the image display device 3 provided with a position detection device (not shown) with the glasses 4 provided with the position specifying device 10. .
[0167]
As shown in FIG. 19A, the operator M can point a button such as a menu screen displayed on the screen of the image display device 3 with the beam light directly projected from the remote control device 2. In this way, in the past, the desired button position was selected by pressing the up / down / left / right direction key several times and pressing the enter button. It becomes possible to select a desired button position by simply doing so, and operability can be improved.
[0168]
Furthermore, even when the cursor is displayed on the screen and the position is specified, the cursor position can be operated in accordance with the beam light. This makes it possible to directly move the cursor by moving an input means such as a mouse by an appropriate amount by the light beam of the remote control device 2.
[0169]
Further, as shown in FIG. 19B, the operator M wearing the glasses 4 equipped with the position specifying device 10 faces the screen of the image display device 3 and beam light at a desired button position on the menu screen. The button can be selected by irradiating with a certain time. As a result, for example, the operation means of the image display device 3 can be provided to a person who cannot operate the remote control device 2 (FIG. 19A) due to hand obstacles or the like.
[0170]
Furthermore, if the glasses 4 provided with the position specifying device 10 are used on a computer display, it is possible to perform screen operations such as cursor operations without releasing the hand from the keyboard, and operability can be improved.
[0171]
FIG. 20 is a diagram illustrating an example in which the present invention is applied to a virtual scope capable of enlarging a portion to be viewed in detail from a display image. FIG. 20A is a schematic diagram illustrating a configuration of the magnifying glass SC that specifies an enlarged region of a display image used for the virtual scope. FIGS. 20B-1 and 20B-2 are conceptual diagrams illustrating how an image is enlarged based on the position of the magnifying glass SC. The virtual scope is disclosed in “Fukaya, Mitsumine, Inoue,“ Virtual Scope ”, Proceedings of the 7th Image Sensing Symposium, pp. 211-214, 2001” and the like.
[0172]
As shown in FIG. 20A, the magnifying glass SC used for the virtual scope has a position specifying device 10 inside. The beam light B emitted from the position specifying device 10 does not irradiate a single point, but uses laser light that irradiates a rectangular region. In this case, the coordinates of each vertex of the rectangular area on the screen irradiated with the laser light are calculated based on the distance between the magnifying glass SC and the screen and the projection angle of the laser light with respect to the irradiation position at the center of the rectangular area. Can be easily calculated.
[0173]
Further, as shown in FIG. 20 (b-1), the beam G of the magnifying glass SC is irradiated onto the screen G from a position separated by d1 from the screen G. The image of the irradiated rectangular region g1 is enlarged and displayed (enlarged image E1). The enlarged image E1 may be displayed by switching the screen G or may be displayed on another display device.
[0174]
FIG. 20B-2 shows a state where the distance d1 in FIG. 20B-1 is further separated (distance d2: d1 <d2). Thus, by arranging the magnifying glass SC at a position far from d1, the rectangular area g2 irradiated on the screen G becomes larger than the rectangular area g1 in FIG. The enlargement ratio of the enlarged image E2 is smaller than that of the enlarged image E1 shown in FIG.
[0175]
As described above, the position designation device and the position detection device according to the present invention have display screens such as use as a remote control device such as a television receiver, use as an input device such as a mouse in a computer, use as a virtual scope, and the like. It can be applied in various apparatuses.
[0176]
【The invention's effect】
  As described above, the position detection device, position detection method, and position detection program according to the present invention.InHas the following excellent effects.
[0177]
  Claim 1,Claim 4OrClaim 5According to the invention described in (4), the position on the screen instructed by the visible light beam can be detected by the slit-shaped diffused light emitted from the position specifying device. As a result, the operator can directly specify the position on the screen in the image display device and perform an operation, so that a user interface with excellent operability can be provided.
[0179]
  Claim 2OrClaim 3According to the invention described in the above, an image can be obtained with a simple configuration in which light detection means such as a photodetector is arranged outside the display area of a display device such as an existing projection display, CRT monitor, liquid crystal monitor, plasma display, or EL display. Since a display device can be realized, an image display device can be manufactured at low cost.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing a configuration of an image display system including a position designation device and a position detection device according to a first embodiment of the present invention.
FIG. 2 is a block diagram showing a configuration of a position specifying device according to the first embodiment of the present invention.
FIG. 3 is a block diagram showing a configuration of a position detection apparatus according to the first embodiment of the present invention.
FIG. 4 is an explanatory diagram for explaining a method of calculating a designated position when a photodetector is arranged outside the left and right display areas of the screen.
FIG. 5 is an explanatory diagram for explaining a method of calculating a designated position when the photodetectors are arranged in parallel outside the display area on one (left side) of the screen.
FIG. 6 is a flowchart showing an operation of the image display system including the position specifying device and the position detecting device according to the first embodiment of the present invention.
[Fig. 7]Reference exampleIt is the schematic which showed the structure of the image display system containing the position designation | designated apparatus and position detection apparatus which concern on 2nd embodiment.
FIG. 8 is a block diagram showing a configuration of a position specifying device according to a second embodiment of the present invention.
FIG. 9 is an explanatory diagram for explaining a method of calculating a designated position when the photodetector is disposed outside the display area on the top, bottom, left, and right of the screen.
FIG. 10 is an explanatory diagram for explaining a method for calculating a designated position when the photodetectors are arranged in parallel outside the left and lower display areas of the screen.
FIG. 11 is a flowchart showing an operation of an image display system including a position designation device and a position detection device according to a second embodiment of the present invention.
FIG.Reference exampleIt is the schematic which showed the structure of the image display system containing the position designation | designated apparatus and position detection apparatus which concern on 3rd embodiment.
FIG. 13 is a block diagram showing a configuration of a position specifying device according to a third embodiment of the present invention.
FIG. 14 is a block diagram showing a configuration of a position detection apparatus according to a third embodiment of the present invention.
FIG. 15 is an explanatory diagram for explaining a method of calculating a distance from a photodetector to a phase specifying device based on an irradiation position and a phase.
FIG. 16 is a block diagram showing a configuration of a position detection apparatus according to a fourth embodiment of the present invention.
FIG. 17 is a block diagram showing a configuration of a position detection device according to a fifth embodiment of the present invention.
FIG. 18 is an explanatory diagram for explaining a method of calculating a distance from a photodetector to a position specifying device.
FIG. 19A is a diagram showing an example in which the position designation device and the position detection device of the present invention are applied to a television receiver.
(B) It is a figure which shows the example at the time of applying the position designation | designated apparatus of this invention to spectacles.
FIG. 20A is an overall view of a virtual scope to which the position specifying device of the present invention is applied. (B) It is a conceptual diagram which shows the concept of operation | movement of the virtual scope to which the position specification apparatus of this invention is applied.
[Explanation of symbols]
1, 1B, 1C ... Image display system
2, 2B, 2C ... Remote control device
3, 3B, 3C ... Image display device
10, 10B, 10C ... Positioning device
11 …… First light projection means
12, 12C ... Second light projection means
13 …… Photosynthesis projection means
14 …… Intensity modulation means
20, 20B, 20C, 20D, 20E …… Position detection device
21 ...... Photodetector array
22 …… Photodetector (light detection means)
23, 23B, 23C, 23D, 23E ... Optical signal detection processing means
24, 24B, 24C ... Irradiation position detection unit (irradiation position detection means)
24a: Light intensity measuring unit (light intensity measuring means)
24b ... Phase detector (phase detector)
25, 25B, 25C ...... Instructed position calculating unit (instructed position calculating means)
26, 26E ...... Photoelectric conversion unit
27 …… Signal extraction unit
30 ...... Display device
40 ...... Image display control device

Claims (5)

By irradiating a slit diffused light diffused in a slit shape with the position indicating light as a center from a position specifying device that indicates an arbitrary position on the screen by the position indicating light, A position detection device for detecting the indicated position of
A plurality of light detecting means arranged outside the display area of the screen and detecting the slit diffused light;
A light intensity measuring means for measuring the light intensity of the slit diffused light detected by the light detecting means;
An irradiation position detection means for detecting an irradiation position of the light detection means that detects the slit diffused light;
An indication position calculation means for calculating the indication position based on the irradiation position of the light detection means detected by the irradiation position detection means and the light intensity of the slit diffused light measured by the light intensity measurement means; ,
A position detection device comprising: The position detection device according to claim 1 , wherein the light detection means is arranged in a line on each of the left and right and / or the top and bottom of the screen outside the display area of the image display device. 2. The position detection according to claim 1 , wherein the light detection unit is arranged in parallel at least at one place on a left side, a right side, an upper part, or a lower part of a screen outside the display area of the image display device. apparatus. By irradiating a slit diffused light diffused in a slit shape with the position indicating light as a center from a position specifying device that indicates an arbitrary position on the screen by the position indicating light, A position detection method for detecting the indicated position of
A light projection step of projecting the slit diffused light onto the screen from the position specifying device;
A light detection step of detecting the slit diffused light projected in the light projection step by a plurality of light detection means arranged outside the display area of the screen;
An irradiation position detection step for measuring the light intensity of the slit diffused light detected in this light detection step with a light intensity measuring means, and detecting the irradiation position of the light detection means for detecting the slit diffused light;
An instruction position calculating step for calculating the instruction position based on the irradiation position of the light detection means detected in the irradiation position detection step and the light intensity of the slit diffused light measured by the light intensity measurement means; ,
A position detection method comprising: By irradiating a slit diffused light diffused in a slit shape with the position indicating light as a center from a position specifying device that indicates an arbitrary position on the screen by the position indicating light, To detect the indicated position of the computer,
Irradiation position detection for detecting an irradiation position of the light detecting means that detects the slit diffused light based on the light intensity of the slit diffused light detected by a plurality of light detecting means arranged outside the display area of the screen means,
Instructed position calculating means for calculating the indicated position based on the irradiated position detected by the irradiated position detecting means and the light intensity of the slit diffused light,
A position detection program that functions as a computer program.

Images