JPS5919483A - Dark current compensating method of solid-state image pickup element - Google Patents
Dark current compensating method of solid-state image pickup elementInfo
- Publication number
- JPS5919483A JPS5919483A JP57129443A JP12944382A JPS5919483A JP S5919483 A JPS5919483 A JP S5919483A JP 57129443 A JP57129443 A JP 57129443A JP 12944382 A JP12944382 A JP 12944382A JP S5919483 A JPS5919483 A JP S5919483A
- Authority
- JP
- Japan
- Prior art keywords
- dark current
- solid
- image pickup
- temperature
- state image
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims description 10
- 238000003384 imaging method Methods 0.000 claims description 11
- 230000006870 function Effects 0.000 description 4
- 239000000523 sample Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 241000277269 Oncorhynchus masou Species 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
- H04N25/60—Noise processing, e.g. detecting, correcting, reducing or removing noise
- H04N25/63—Noise processing, e.g. detecting, correcting, reducing or removing noise applied to dark current
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Picture Signal Circuits (AREA)
- Transforming Light Signals Into Electric Signals (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、固体撮像素子の暗電流補償方法に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dark current compensation method for a solid-state image sensor.
固体撮像素子から出力される出力信号には、撮影１言号
として有効に寄与する―−号酸成分、撮影画成として有
効に寄与しない１１１電流分とが含まれている。The output signal outputted from the solid-state image sensor includes an acid component that effectively contributes to forming a photographic image, and a 111 current component that does not effectively contribute to forming a photographic image.
従来から、この固体撮像索子に生ずる暗電流弁を取り除
いて撮影するための工夫がなされており、たとえば、Ｃ
ＣＤ等の固体撮像索子を使用した電子カメラ等において
は、固体撮像素子に生ずる暗電流が温度と露光時間とに
依存することから、撮影を行なう前に固体撮像素子にあ
らかじめたまっている暗電流弁としての電荷をアース等
の手段によって放電除去し、シャッターが閉じられた状
態で、このシャッターの開閉測度によって決定される露
光時間のうちＫ、この固体撮像素子に暗電流弁としての
電荷がとのぐらいたまるかということをあらかじめ知っ
て、その後にシャッターを実際に開閉させて撮影を行な
うようにしている。この固体撮像素子の暗′ｔ！Ｌ＃、
補償方法によれば、撮影開始から撮影終了までの間に固
体撮像索子にたまる暗電流弁としての電荷を補償し、正
確な撮影信号を得ることができるが、シャッタースピー
ドに相当する露光時間だけ撮影が遅れることとなり、暗
ければ暗い程撮影６１１１定が遅れるという欠点を有し
ており、撮影測定操作も２度手間となる。Conventionally, efforts have been made to remove the dark current valve that occurs in the solid-state imaging probe.
In electronic cameras that use a solid-state imaging device such as a CD, the dark current generated in the solid-state imaging device depends on the temperature and exposure time, so the dark current that has accumulated in the solid-state imaging device before shooting is The electric charge acting as a valve is discharged and removed by means such as grounding, and when the shutter is closed, the electric charge acting as a dark current valve is removed from the solid-state image sensor for K out of the exposure time determined by the opening/closing rate of the shutter. I try to know in advance how much of the image will accumulate, and then actually open and close the shutter to take the picture. The darkness of this solid-state image sensor! L#,
According to the compensation method, it is possible to compensate for the electric charge accumulated in the solid-state imaging probe as a dark current valve between the start of shooting and the end of shooting, and obtain accurate shooting signals, but only for the exposure time corresponding to the shutter speed. This results in a delay in photographing, and has the drawback that the darker it is, the longer the photographing 6111 determination is delayed, and the photographing and measurement operation also requires two steps.
本発明は、上記従来技術の有する欠点に鑑みてなされた
もので１本発明の目的は、撮影時間を延ばすことなく暗
電流分を除去できるようにした固体虚像素子の暗電流・
４償方法を提供することにある。The present invention has been made in view of the above-mentioned drawbacks of the prior art.An object of the present invention is to eliminate the dark current component of a solid-state virtual image element by making it possible to remove the dark current component without prolonging the imaging time.
The purpose is to provide four methods of compensation.
本発明の構成は、固体撮像素子に生ずる暗電流の値を、
ｍ度及び露光時間の関数としてあらかじめ記憶し、撮影
時に固体撮像素子に生ずる出力信号から、温度及び露光
時間の関数としてあらかじめ記憶された暗電流値のうち
、その撮影時における温度及び露光時間に対応する暗電
流値を減算して、撮影時に固体撮像素子に生ずる暗電流
分をその減算分だけ除去するようにした固体撮像素子の
暗電流補償方法である。The configuration of the present invention allows the value of dark current generated in the solid-state image sensor to be
The dark current value is stored in advance as a function of temperature and exposure time, and is determined from the output signal generated in the solid-state image sensor at the time of photographing, which corresponds to the temperature and exposure time at the time of photographing. This is a dark current compensation method for a solid-state image sensor in which the dark current value generated in the solid-state image sensor during imaging is removed by the subtracted amount by subtracting the dark current value.
け下、本発明に係る固体撮像索子の暗電流補償方法を、
南面を４照しつつ説明する９図は、本発明に係る固体撮
像素子の暗電流補償方法をｉ５２明するだめの模式図を
示すもので、この図において、ｌは被写体、２はシャッ
ター。Below, the dark current compensation method for a solid-state imaging probe according to the present invention,
Figure 9, which will be explained while looking at the south side, is a schematic diagram for explaining the dark current compensation method for a solid-state image pickup device according to the present invention. In this figure, l is the subject and 2 is the shutter.
３は光学レンズ、４け固体虚像素子、５は感温センナ−
であって、この感温センナ−５ｒ、ｒ 固体虚像素子４
の温度を極力正確に測定するために。3 is an optical lens, 4 solid virtual image elements, 5 is a temperature sensor
The temperature-sensitive sensor 5r, r solid-state virtual image element 4
In order to measure the temperature as accurately as possible.
固体撮像素子４の近傍に設けられる構成となっているっ
６はリードオンリーメモリ、プログラマブルメモリ等
の記憶素子であり、この記憶素子６に、固体撮像索子４
に生ずる暗電流の値が、温度及び露光時間の関数として
あらかじめ記憶されるものである。この固体撮像索子４
に生ずる暗電流の値は、実験によって知ることができ、
この実験値から実験式を求めて、これを記憶素子６に情
報として記憶メ１でおくことができるし、また、温度と
露光時間とそのときの暗電流の値とを、−組の数値とし
てこれを記憶素子６Ｋｓ己１意はキでおくこともできる
。6 is a memory element such as a read-only memory or a programmable memory, and the solid-state image sensor 4 is installed in the vicinity of the solid-state image sensor 4.
The value of the dark current produced in the image is stored in advance as a function of temperature and exposure time. This solid-state imaging probe 4
The value of the dark current that occurs can be determined by experiment.
An empirical formula can be obtained from this experimental value and stored as information in the memory element 6, and the temperature, exposure time, and dark current value at that time can be stored as a - set of numerical values. It is also possible to set this to the memory element 6Ks.
７は、割り出し回路であり、この害０り出し回路７は、
シャッター２のシャッタースピードと。7 is an indexing circuit, and this harm 0 detection circuit 7 is
Shutter speed of shutter 2.
感温セン＋ｔ′−５の温度情渚とから、温度及び露光時
「ｌ」の関数としてあらかじめ記憶ばれた暗電流値のう
ら、その撮影時における温度及び露光時１１Ｊ１に対応
する暗′岨流値を割り出してこれを暗蛋流分として出力
するようにされており、この暗電流分は、尭分回路８に
入力されている。この差分回路８には、固体虚像素子４
に生ずる撮影は号が入力されており、このＪ４影百号か
ら割り出し回路７によって生成された暗電ｍ「分が減算
され、出カブれるようになっている。なお、ここでは、
温度と露光時間とのみから暗電流値を関数としてイ４る
ようにしたが、これに限られるもので７よなく、たとえ
ば、固体虚像素子の生産ロットによる変動をも記憶素子
に記憶さぜるようにすることもできる。。Based on the temperature characteristics of the thermosensor +t'-5, the dark current value corresponding to the temperature at the time of photographing and the time of exposure 11J1 is calculated on the other side of the dark current value stored in advance as a function of temperature and "l" at the time of exposure. A value is calculated and outputted as a dark current component, and this dark current component is inputted to the dark current component 8. This differential circuit 8 includes a solid-state virtual image element 4
The number of the image taken is inputted, and from this J4 image 100 number, the dark electric current m' minute generated by the indexing circuit 7 is subtracted so that it can be output.
Although the dark current value is calculated as a function from only the temperature and the exposure time, it is not limited to this. For example, variations due to production lots of solid-state virtual image elements can also be stored in the memory element. You can also do it like this. .
本発明の方法によれば、撮影中に暗電流分を除去するよ
うにしたので撮影時間を延はすことなく、正確な撮影は
号をうろことができる。According to the method of the present invention, since the dark current component is removed during photographing, accurate photographing can be achieved without prolonging the photographing time.
図は本発明に係る固体撮像索子の暗電流補償方法を説明
するだめの模式図である７、１・・・被写体
２−・・ シャッター
３ ・・・光学レンズ
４ ・・・固体撮像素子
５ ・・・感温センナ−
６・・・記憶素子
７ ・・・割り出し回路
８ ・・・差分回路
特許出、顧へ 株式会社三協精機製作所代理人 升埋十
４ 優 美
（＃１力λ１名）The figure is a schematic diagram for explaining the dark current compensation method for a solid-state imaging device according to the present invention. ... Temperature sensing sensor 6 ... Memory element 7 ... Indexing circuit 8 ... Differential circuit patent issued to customer Sankyo Seiki Seisakusho Co., Ltd. representative Masu Umeju 4 Yumi (#1 force λ1 person) )
Claims (1)
び露光時間の関数としてあらかじめ記憶し、撮影時に固
体撮像索子に生ずる出力信号から、温度及び露光時間の
関数としてあらかじめ記憶された暗電流値のうち、その
撮影時における温度及び露光時間に対応する暗電流値を
減算して、撮影時に固体撮像素子に生ずる暗電流弁を除
去するようにした固体撮像素子の暗電流補償方法。(1) The value of the dark current generated in the solid-state image sensor is stored in advance as a function of temperature and exposure time, and the dark current value stored in advance as a function of temperature and exposure time is determined from the output signal generated in the solid-state image sensor during imaging. A dark current compensation method for a solid-state image sensor, in which a dark current value that corresponds to the temperature and exposure time at the time of image capture is subtracted from among the values to remove a dark current valve that occurs in the solid-state image sensor during image capture.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57129443A JPS5919483A (en) | 1982-07-24 | 1982-07-24 | Dark current compensating method of solid-state image pickup element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57129443A JPS5919483A (en) | 1982-07-24 | 1982-07-24 | Dark current compensating method of solid-state image pickup element |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5919483A true JPS5919483A (en) | 1984-01-31 |
| JPS6359632B2 JPS6359632B2 (en) | 1988-11-21 |
Family
ID=15009589
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57129443A Granted JPS5919483A (en) | 1982-07-24 | 1982-07-24 | Dark current compensating method of solid-state image pickup element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5919483A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61205076A (en) * | 1985-03-08 | 1986-09-11 | Asahi Optical Co Ltd | Electronic still camera |
| US5216511A (en) * | 1990-05-25 | 1993-06-01 | Asahi Kogaku Kogyo Kabushiki Kaisha | Imaging device with elimination of dark current |
| EP0729270A2 (en) * | 1995-02-24 | 1996-08-28 | Eastman Kodak Company | Black pattern correction for a charge transfer sensor |
| JP2004525573A (en) * | 2001-03-29 | 2004-08-19 | ギブン・イメージング・リミテッド | Method for timing control |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0626262Y2 (en) * | 1992-03-23 | 1994-07-20 | パラマウントベッド株式会社 | Assistance tool |
| FR2964818B1 (en) * | 2010-09-14 | 2012-09-28 | Thales Sa | OPTRONIC SYSTEM WITH SUPRA HEMISPHERIC VISION |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5511683A (en) * | 1978-07-12 | 1980-01-26 | Nec Corp | Sensor correction device |
| JPS5772113A (en) * | 1980-10-23 | 1982-05-06 | Canon Inc | Signal processing system |
-
1982
- 1982-07-24 JP JP57129443A patent/JPS5919483A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5511683A (en) * | 1978-07-12 | 1980-01-26 | Nec Corp | Sensor correction device |
| JPS5772113A (en) * | 1980-10-23 | 1982-05-06 | Canon Inc | Signal processing system |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61205076A (en) * | 1985-03-08 | 1986-09-11 | Asahi Optical Co Ltd | Electronic still camera |
| US5216511A (en) * | 1990-05-25 | 1993-06-01 | Asahi Kogaku Kogyo Kabushiki Kaisha | Imaging device with elimination of dark current |
| EP0729270A2 (en) * | 1995-02-24 | 1996-08-28 | Eastman Kodak Company | Black pattern correction for a charge transfer sensor |
| EP0729270A3 (en) * | 1995-02-24 | 1998-03-18 | Eastman Kodak Company | Black pattern correction for a charge transfer sensor |
| JP2004525573A (en) * | 2001-03-29 | 2004-08-19 | ギブン・イメージング・リミテッド | Method for timing control |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6359632B2 (en) | 1988-11-21 |
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