WO2013042199A1 - 画像表示方法および画像表示システム - Google Patents
画像表示方法および画像表示システム Download PDFInfo
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- WO2013042199A1 WO2013042199A1 PCT/JP2011/071373 JP2011071373W WO2013042199A1 WO 2013042199 A1 WO2013042199 A1 WO 2013042199A1 JP 2011071373 W JP2011071373 W JP 2011071373W WO 2013042199 A1 WO2013042199 A1 WO 2013042199A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3179—Video signal processing therefor
- H04N9/3185—Geometric adjustment, e.g. keystone or convergence
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/3147—Multi-projection systems
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
- G06F3/1423—Digital output to display device ; Cooperation and interconnection of the display device with other functional units controlling a plurality of local displays, e.g. CRT and flat panel display
- G06F3/1446—Digital output to display device ; Cooperation and interconnection of the display device with other functional units controlling a plurality of local displays, e.g. CRT and flat panel display display composed of modules, e.g. video walls
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2340/00—Aspects of display data processing
- G09G2340/10—Mixing of images, i.e. displayed pixel being the result of an operation, e.g. adding, on the corresponding input pixels
Definitions
- the present invention relates to an image display method and an image display system.
- a stacking projection method in which projected images from the respective projectors are superimposed on a screen. According to this method, it is possible to obtain a high-luminance video display using an inexpensive projector.
- the projection images from the two projectors are captured by the camera, the captured images are subjected to image processing by the PC, and the correction amount for correcting the distortion of the projection image is calculated.
- the corrected image calculated based on the correction amount from the projector it is possible to accurately superimpose the projected images from the two projectors on the screen.
- the calculation of the corrected image requires a complicated test pattern to be displayed and photographed, and the correction amount needs to be calculated based on the display, so the processing becomes very complicated.
- an object of the present invention is to provide an image display method and an image display system that can superimpose projected images from a projector on a screen in a relatively simple and easy manner.
- an image display method of the present invention includes a projection unit that projects an image, an image generation unit that generates an image based on an image signal, and a control that controls the projection unit and the image generation unit.
- An image display method performed by a first projector and a second projector, each of which includes an image capturing unit installed in the vicinity of the projection unit and an optical axis parallel to the projection optical axis of the projection unit.
- the screen on which the image by the projection unit is projected is arranged so that the projection plane is perpendicular to the horizontal plane, and the first and second projectors are arranged so that the projection optical axis by the projection unit is parallel to the horizontal plane and on the screen.
- a correction image for angle evaluation is calculated by image correction using as a parameter, a step of obtaining an angle at which the correction image for angle evaluation coincides with the inverted image, and a control unit of the second projector determines the angle of each projector from the obtained angle.
- the step of calculating the tilt angle of the optical axis with respect to the normal of the screen, respectively, and the image generation unit of each projector based on the tilt angle information calculated by the control unit of the second projector, using the angle as a parameter A step of generating a corrected image by image correction, and a step of projecting each corrected image on a screen by a projection unit of each projector, Image correction using the angle as a parameter performed by the control unit of the projector and the image generation unit of each projector is projected from the projector when the projector is at a position inclined by a predetermined angle with respect to the normal line of the screen.
- An observed image of the projected image viewed from the normal direction of the screen is a corrected image of the projected image viewed from the optical axis direction of the projector.
- the image display system of the present invention includes a projection unit that projects an image, an image generation unit that generates an image based on an image signal, a control unit that controls the projection unit and the image generation unit, and an optical axis that projects.
- An image display system including first and second projectors each having an image photographing unit installed in the vicinity of the projection unit and parallel to the projection optical axis of the projection unit, wherein the projection unit of the first projector includes: The predetermined projection image is projected onto the screen, the image photographing unit of the second projector photographs the predetermined projection image on the screen, and the control unit of the second projector captures the observation image photographed by the image photographing unit.
- an angle evaluation correction image is calculated by image correction using the angle as a parameter, and an angle at which the angle evaluation correction image matches the inverted image is obtained.
- An inclination angle of the optical axis of each projector with respect to the normal of the screen is calculated from the obtained angle, and the image generation unit of each projector is based on the information of the inclination angle calculated by the control unit of the second projector.
- a corrected image is generated by image correction using the angle as a parameter, and the projection unit of each projector projects each corrected image onto the screen, and the angle performed by the control unit of the second projector and the image generation unit of each projector
- the image correction using as a parameter is the observation image viewed from the normal direction of the screen of the projected image projected from the projector when the projector is at a position inclined by a predetermined angle with respect to the normal line of the screen.
- the projected image is corrected when viewed from the optical axis direction of the projector.
- FIG. 1 is a schematic plan view showing an embodiment of the image display system of the present invention, as viewed from the vertical direction.
- the image display system 1 is composed of two projectors 10 and 20.
- the two projectors 10 and 20 are arranged so that the optical axes A and B are parallel to the horizontal plane and intersect on the screen 2 with respect to the screen 2 arranged so that the projection plane is perpendicular to the horizontal plane.
- the projectors 10 and 20 control the projection units 11 and 21 that project images, the image generation units 12 and 22 that generate images based on image signals, and the projection units 11 and 21 and the image generation units 12 and 22, respectively. And control units 13 and 23 to perform.
- Each projector 10, 20 includes a built-in camera (image capturing unit) that captures an image projected on the screen.
- the built-in cameras 14 and 24 have their optical axes parallel to the optical axes A and B of the projection units 11 and 21 of the projectors 10 and 20, respectively, and are built in positions near the projection units 11 and 21, respectively.
- the control units 13 and 23 of the projectors 10 and 20 are communicably connected by the communication means 3 and can exchange signals and the like with each other. In the illustrated embodiment, the wired communication means 3 is used, but wireless communication is also possible.
- a half mirror or prism can be used so that the optical axis of the projection unit and the optical axis of the built-in camera are completely matched.
- FIGS. 2A to 5 show projected images projected from the projectors shown in FIG. 1 and observed images thereof.
- the broken line shown in each figure represents the projected image of the projector when viewed from the optical axis direction of the projector, in other words, the image projected on a virtual screen perpendicular to the optical axis of the projector.
- the solid line shown in each figure represents an observation image obtained by observing a projection image projected on a screen from a projector at a position inclined with respect to the screen from a predetermined position.
- the optical axis of the projection unit and the optical axis of the built-in camera are not exactly the same, but if the distance between the projection unit and the built-in camera is sufficiently small relative to the projection distance, the optical axes of the two will match. The image correction is not a problem even if it is treated as being.
- the distance between the projection unit and the built-in camera is known, and if necessary, correction data can be prepared in advance.
- FIG. 2A shows an observed image 10b of the projected image 10a of the all-white screen that is projected from the first projector 10 onto the screen 2 and is not image-corrected, as viewed from the front direction (normal direction) of the screen 2.
- the observed image 10b can be said to be an image obtained by rotating the projection image 10a by the rotation angle ⁇ of the first projector 10 with respect to the front direction of the screen 2.
- FIG. 2B shows an observation image 10c obtained by projecting the projected image 10a of the all-white screen projected from the first projector 10 onto the screen 2 with the built-in camera 24 of the second projector 20.
- the observed image 10c can be said to be an image obtained by rotating the projection image 10a by the rotation angle 2 ⁇ of the first projector 10 with respect to the optical axis direction of the second projector 20.
- FIG. 3A shows an observation image 20 b that is projected from the second projector 20 onto the screen 2 and viewed from the front direction of the screen 2 of a projected image 20 a of an all-white screen that is not subjected to image correction. That is, the observed image 20b can be said to be an image obtained by rotating the projection image 20a by the rotation angle ⁇ of the second projector 20 with respect to the front direction of the screen 2.
- FIG. 3B shows an observed image 20c obtained by projecting the projected image 20a of the whole white screen projected from the second projector 20 onto the screen 2 with the built-in camera 14 of the first projector 10 without image correction. ing. That is, it can be said that the observed image 20c is an image obtained by rotating the projection image 20a by the rotation angle ⁇ 2 ⁇ of the second projector 20 with respect to the optical axis direction of the first projector 10.
- the first projector 10 projects the corrected image, which is corrected so that the projected image 10a shown in FIG. 2A is rotated in the reverse direction to the observed image 10b, that is, by ⁇ , onto the screen 2.
- the corrected image at this time is shown in FIG. 4A.
- the corrected image 10d is equivalent to the observed image 20b shown in FIG. 3A. Therefore, when the first projector is at a position inclined by ⁇ with respect to the normal line of the screen, the first projector moves from the screen to the screen. This is equivalent to the observed image of the projected white screen without image correction, viewed from the normal direction of the screen.
- the projected image 20 a shown in FIG. 3A is reversely rotated from the observed image 20 b, that is, a corrected image corrected so as to be rotated by ⁇ is projected onto the screen 2, so that the screen 2
- the projected image 20a can be seen from the front direction.
- the corrected image 20d at this time is shown in FIG. 4B.
- the corrected image 20d is equivalent to the observed image 10b shown in FIG. 2A. Therefore, when the second projector is at a position inclined by ⁇ with respect to the normal line of the screen, the second image is projected onto the screen. This is equivalent to an observed image of an all-white screen that is not image corrected, viewed from the normal direction of the screen.
- FIG. 6 is a flowchart of the image display method of the present embodiment.
- a corrected image 10f indicated by a broken line in FIG. Become.
- This corrected image 10f is a left-right symmetric image of the observed image 10c shown in FIG.
- the observation image 10c is obtained by rotating the projection image 10a of the first projector 10 by the rotation angle 2 ⁇ of the first projector 10 with the optical axis direction of the second projector 20 as a reference. It can be said that it is an image. Therefore, the inclination angle ⁇ of the projectors 10 and 20 can be obtained by the following procedure.
- the screen 2 and the first and second projectors 10 and 20 are arranged so as to be in the positions shown in FIG. 1 (step S1). Then, the projection unit 11 of the first projector 10 projects an all-white screen without image correction on the screen 2 (step S2), and the built-in camera 24 of the second projector 20 captures the projected image on the screen 2. (Step S3).
- the control unit 23 of the second projector 20 calculates an inverted image obtained by inverting the captured observation image with respect to the perpendicular (step S4), and then performs image correction using the angle as a parameter as described above. An angle calculation corrected image is calculated.
- step S5 when the angle at which the angle calculation correction image matches the above-described inverted image is obtained (step S5), the angle at this time becomes 2 ⁇ .
- the inclination angle (inclination angle of each optical axis 10a, 10b with respect to the normal X of the screen 2) ⁇ is calculated by the control unit 23 of the second projector 20 (step S6).
- the information of the obtained inclination angle ⁇ is sent to the image generation units 12 and 22 of the projectors 10 and 20 together with the respective image signals. Based on the information, the image generation units 12 and 22 are shown in FIGS. 4A and 4B.
- Such a corrected image is generated (step S7).
- the corrected images are projected on the screen 2 by the projection units 11 and 21 of the projectors 10 and 20 (step S8).
- the projected images (corrected images) from the projectors 10 and 20 can be superimposed on the screen 2.
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Abstract
Description
2 スクリーン
3 通信手段
10 第1のプロジェクタ
20 第2のプロジェクタ
A,B 光軸
11、21 投写部
12,22 画像生成部
13,23 制御部
14,24 内蔵カメラ
10a,20a 投写画像
10b,10c,20b,20c,10e 観測画像
10d,10f,20d 補正画像
Claims (4)
- 画像を投写する投写部と、画像信号に基づいて画像を生成する画像生成部と、前記投写部および画像生成部の制御を行う制御部と、光軸が前記投写部の投写光軸と平行であって、前記投写部の近傍に配置された画像撮影手段とをそれぞれ有する第1および第2のプロジェクタで行われる画像表示方法であって、
前記投写部による画像が投写されるスクリーンを、投写面が水平面に垂直となるように配置し、前記第1および第2のプロジェクタを、前記投写部による前記投写光軸が前記水平面に平行となり、かつ、前記スクリーン上で交差するように、前記スクリーンの法線に対して対称に配置するステップと、
前記第1のプロジェクタの前記投写部が、所定の投写画像を前記スクリーンに投写するステップと、
前記第2のプロジェクタの前記画像撮影手段が、前記スクリーン上の前記所定の投写画像を撮影するステップと、
前記第2のプロジェクタの前記制御部が、前記画像撮影手段で撮影した観測画像を垂線に対して反転させた反転画像を算出した後、角度をパラメータとした画像補正により角度評価用補正画像を算出し、該角度評価用補正画像が前記反転画像に一致する角度を求めるステップと、
前記第2のプロジェクタの前記制御部が、前記求めた角度から、前記各プロジェクタの前記光軸の、前記スクリーンの前記法線に対する傾斜角をそれぞれ計算するステップと、
前記各プロジェクタの前記画像生成部が、前記第2のプロジェクタの前記制御部で計算された前記傾斜角の情報に基づいて、前記角度をパラメータとした画像補正による補正画像を生成するステップと、
前記各プロジェクタの前記投写部が、前記各補正画像を前記スクリーンに投写するステップと、を含み、
前記第2のプロジェクタの前記制御部、および前記各プロジェクタの前記画像生成部で行われる前記角度をパラメータとした画像補正は、前記プロジェクタが前記スクリーンの前記法線に対して所定の角度だけ傾斜した位置にあるとしたときに前記プロジェクタから投写される投写画像の、前記スクリーンの法線方向から見た観測画像を、前記プロジェクタの光軸方向から見たときの、前記投写画像の補正された画像とすることを特徴とする、画像表示方法。 - 前記傾斜角は、前記算出角度の1/2である、請求項1に記載の画像表示方法。
- 前記所定の投写画像は、画像補正しない全白画面である、請求項1または2に記載の画像表示方法。
- 画像を投写する投写部と、画像信号に基づいて画像を生成する画像生成部と、前記投写部および画像生成部の制御を行う制御部と、光軸が前記投写部と平行であって、前記投写部の近傍に配置された画像撮影手段とをそれぞれ有する第1および第2のプロジェクタからなる画像表示システムであって、
前記第1のプロジェクタの前記投写部は、所定の投写画像をスクリーンに投写し、
前記第2のプロジェクタの前記画像撮影手段は、前記スクリーン上の前記所定の投写画像を撮影し、
前記第2のプロジェクタの前記制御部は、前記画像撮影手段で撮影した観測画像を垂線に対して反転させた反転画像を算出した後、角度をパラメータとした画像補正により角度評価用補正画像を算出し、該角度評価用補正画像が前記反転画像に一致する角度を求め、該求めた角度から、前記各プロジェクタの前記光軸の、前記スクリーンの前記法線に対する傾斜角をそれぞれ計算し、
前記各プロジェクタの前記画像生成部は、前記第2のプロジェクタの前記制御部で計算された前記傾斜角の情報に基づいて、前記角度をパラメータとした画像補正による補正画像を生成し、
前記各プロジェクタの前記投写部は、前記各補正画像を前記スクリーンに投写し、
前記第2のプロジェクタの前記制御部、および前記各プロジェクタの前記画像生成部で行われる前記角度をパラメータとした画像補正は、前記プロジェクタが前記スクリーンの前記法線に対して所定の角度だけ傾斜した位置にあるとしたときに前記プロジェクタから投写される投写画像の、前記スクリーンの法線方向から見た観測画像を、前記プロジェクタの光軸方向から見たときの、前記投写画像の補正された画像とすることを特徴とする、画像表示システム。
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JP2004336225A (ja) * | 2003-05-02 | 2004-11-25 | Seiko Epson Corp | 画像処理システム、プロジェクタ、プログラム、情報記憶媒体および画像処理方法 |
JP2005229282A (ja) * | 2004-02-12 | 2005-08-25 | Seiko Epson Corp | プロジェクタおよびマルチプロジェクションディスプレイ |
JP2008061063A (ja) * | 2006-09-01 | 2008-03-13 | Seiko Epson Corp | 情報処理装置、情報処理プログラム、及びその記録媒体 |
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JP2004336225A (ja) * | 2003-05-02 | 2004-11-25 | Seiko Epson Corp | 画像処理システム、プロジェクタ、プログラム、情報記憶媒体および画像処理方法 |
JP2005229282A (ja) * | 2004-02-12 | 2005-08-25 | Seiko Epson Corp | プロジェクタおよびマルチプロジェクションディスプレイ |
JP2008061063A (ja) * | 2006-09-01 | 2008-03-13 | Seiko Epson Corp | 情報処理装置、情報処理プログラム、及びその記録媒体 |
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