KR940027470A

KR940027470A - Image input device

Info

Publication number: KR940027470A
Application number: KR1019930009696A
Authority: KR
Inventors: 이성덕
Original assignee: 김광호; 삼성전자 주식회사
Priority date: 1993-05-31
Filing date: 1993-05-31
Publication date: 1994-12-10

Abstract

본 발명은 광원과, 광전변환하는 CCD센서수단과, 이 센서수단의 출력을 증폭하여 디지탈데이타로 변환하는 A/D변환수단을 포함하는 화상입력장치에 있어서, 광영상에 대한 전기신호가 아날로그단에서 최대 다이내믹영역(dynamic range)을 갖도록 하기 위해, 증폭된 아날로그신호중 A/D변환수단의 최대허용값 이상인 신호만이 A/D변환수단으로 제공되게 하는 교정제어수단과, A/D변환수단으로부터 실제로 출력되는 디지탈데이타값의 최대치를 검출하고 이 값과 A/D변환수단의 최대허용값의 차를 구하는 연산수단 및, 이 연산수단에 의해 구해진 차를 노광시간으로 보상하기 위해 차에 해당하는 디지탈데이타값을 노광시간으로 바꾸어주는 데이타변환수단을 포함함으로써, 원래의 화상을 재현함에 있어 정보의 손실을 줄여 충실한 화상을 얻을 수 있도록 한다.The present invention provides an image input apparatus including a light source, CCD sensor means for photoelectric conversion, and A / D conversion means for amplifying the output of the sensor means and converting the output into digital data. In order to have a maximum dynamic range in the A / D conversion means, a calibration control means for providing only the signal of the amplified analog signal more than the maximum allowable value of the A / D conversion means to the A / D conversion means, Calculation means for detecting the maximum value of the digital data value actually output and calculating the difference between this value and the maximum allowable value of the A / D conversion means, and a digital value corresponding to the difference in order to compensate the difference obtained by the calculation means with an exposure time. By including data converting means for converting the data value to the exposure time, it is possible to obtain a faithful image by reducing the loss of information in reproducing the original image.

Description

Image input device

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제1도는 화상처리 시스템의 구성을 간략하게 나타낸 도면, 제2도는 종래의 화상입력장치의 구성을 나타낸 블럭도, 제3도는 본 발명을 포함하는 화상입력장치의 구성을 나타낸 블럭도, 제4도는 제3도에 있어서 클램핑부(108) 및 아날로그 스위치부(109)의 예를 나타낸 회로도, 제5도는 디지탈 데이타값을 노광시간으로 환산하는 표, 제6도는 본 발명의 동작을 설명하기 위한 흐름도, 제7도는 한 라인에 대한 주사시간에 따라 광전변환부에 의해 전기신호로 변환되어 A/D변환기로 제공되는 신호의 파형을 나타낸 도면.1 is a schematic diagram showing the configuration of an image processing system, FIG. 2 is a block diagram showing the configuration of a conventional image input apparatus, FIG. 3 is a block diagram showing the configuration of an image input apparatus including the present invention, and FIG. FIG. 3 is a circuit diagram showing an example of the clamping unit 108 and the analog switch unit 109. FIG. 5 is a table for converting digital data values into exposure time. FIG. 6 is a flowchart for explaining the operation of the present invention. 7 is a view showing a waveform of a signal converted to an electrical signal by a photoelectric conversion unit and provided to an A / D converter according to a scanning time for one line.

Claims

Photoelectric conversion means 101 which is driven by a driving means 107 operated under the control of the control means 201 and converts an optical image signal into an analog electric signal, and amplifies the output of the photoelectric conversion means 101. An amplification means 102, a sample hold time 103 for sampling and holding an analog signal amplified by the amplification means 101, and an output signal of the sample holding means 103 to be converted into a digital signal; In the image input device comprising an A / D conversion means 104, the sample holding means 103 and the A / D conversion means 104 is connected to and controlled by the control means 201 Calibration control means for causing only the signal which is equal to or larger than the maximum allowable value of the A / D conversion means 104 to be provided from the sample holding means 103 to the A / D conversion means 104, and the A / D conversion means ( 103) detects the maximum value of the digital data actually output from A calculation means 110 for obtaining a difference between the maximum allowable values of the A / D conversion means 103, and a digital data value corresponding to the difference to compensate for the difference obtained by the calculation means 110 at an exposure time. And data conversion means (111) for converting the time to the exposure time.

The method of claim 1, wherein the calibration control means is clamped by the clamping means 108 for clamping the output signal of the sample holding means 103, and controlled by the control means 201 of the sample holding means (103) And an analog switch means (109) for selecting any one of an output signal and an output signal of the clamping means (108) and providing the signal to the A / D conversion means (104).

※ Note: This is to be disclosed by the original application.