JPH0485958U

JPH0485958U -

Info

Publication number: JPH0485958U
Application number: JP12885790U
Authority: JP
Priority date: 1990-11-30
Filing date: 1990-11-30
Publication date: 1992-07-27

Description

[Brief explanation of the drawing]

第１図は本考案の画像入力装置のブロツク構成
図、第２図Ａ，Ｂは暗電流出力の交流（ノイズ）
成分の夫々瞬時データ及びアベレーシングデータ
を示す波形図、第３図はカラー映像信号のレベル
のヒストグラム、第４図は第３図の部分拡大図（
ランダムノイズを含む）である。１……画像入力装置、Ｓ……シヤツタ、２……
ＣＣＤライン（イメージ）センサ、３……Ａ／Ｄ
コンバータ、４……デイジタルクランプ回路、５
……暗電流補正回路、６……感度斑補正回路、７
……階調変換回路、８……マトリツクス回路、９
……制御回路、Ｍ_１，Ｍ_２……補正用メモリ、Ｍ
_３……プリスキヤンメモリ。 Figure 1 is a block diagram of the image input device of the present invention, Figure 2 A and B are dark current output alternating current (noise)
A waveform diagram showing instantaneous data and averaging data of each component, Figure 3 is a histogram of the level of the color video signal, and Figure 4 is a partially enlarged view of Figure 3 (
(including random noise). 1... Image input device, S... Shutter, 2...
CCD line (image) sensor, 3...A/D
Converter, 4...Digital clamp circuit, 5
... Dark current correction circuit, 6 ... Sensitivity unevenness correction circuit, 7
... Gradation conversion circuit, 8 ... Matrix circuit, 9
...Control circuit, _M1 , _M2 ...Correction memory, M
₃ ...Priscan memory.

Claims

[Claims for Utility Model Registration] A solid-state image sensor that photoelectrically reads an image on a film, an A/D converter that converts analog R, G, and B signals from the solid-state image sensor into digital signals, and an A/D converter that converts analog R, G, and B signals from the solid-state image sensor into digital signals. A digital clamp circuit that determines the black level in the D converter output every 1H, a dark current correction circuit that corrects dark current components in the output signal of the digital clamp circuit, and sensitivity unevenness in the output signal of the dark current correction circuit. a sensitivity unevenness correction circuit that corrects the component, a gradation characteristic conversion circuit that converts the gradation characteristics of the output signal of the sensitivity unevenness correction circuit, an image memory that stores approximately one screen worth of read data, and the gradation characteristic conversion described above. A matrix circuit that serially converts and outputs each digital R, G, and B signal after performing predetermined color correction on the output signal of the circuit, and a control circuit that controls various operations of the dark current correction circuit or the matrix circuit. The white level and the black level are determined using a histogram calculated using the data in the image memory, and the noise level of the light-shielding part in the solid-state image sensor is determined after the dark current is corrected by the dark current correction circuit. Based on
An image input device characterized in that it is configured to discriminate between the white level and black level.