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An Adaptive Colorimetry Analysis Method of Image using a CIS Transfer Characteristic and SGL Functions  

Lee, Sung-Hak (경북대학교 전자전기컴퓨터학부)
Lee, Jong-Hyub (삼성전자 DMC 연구소)
Sohng, Kyu-Ik (경북대학교 전자전기컴퓨터학부)
Publication Information
Journal of Korea Multimedia Society / v.13, no.5, 2010 , pp. 641-650 More about this Journal
Abstract
Color image sensors (CIS) output color images through image sensors and image signal processing. Image sensors that convert light to electrical signal are divided into CMOS image sensor and CCD image sensor according to transferring method of signal charge. In general, a CIS has RGB output signals from tri-stimulus XYZ of the scene through image signal processing. This paper presents an adaptive colorimetric analysis method to obtain chromaticity and luminance using CIS under various environments. An image sensor for the use of colorimeter is characterized based on the CIE standard colorimetric observer. We use the method of least squares to derive a colorimetric characterization matrix between camera RGB output signals and CIE XYZ tristimulus values. We first survey the camera characterization in the standard environment then derive a SGL(shutter-gain-level) function which is relationship between luminance and auto exposure (AE) characteristic of CIS, and read the status of an AWB(auto white balance) function. Then we can apply CIS to measure luminance and chromaticity from camera outputs and AE resister values without any preprocessing. Camera RGB outputs, register values, and camera photoelectric characteristic are used to analyze the colorimetric results for real scenes such as chromaticity and luminance. Experimental results show that the proposed method is valid in the measuring performance. The proposed method can apply to various fields like surveillant systems of the display or security systems.
Keywords
CIS(color image sensor); AE(auto exposer); AWB(auto white balance); Colorimetry;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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1 김은수, 박종선, 장수욱, 한찬호, 송규익, "기준 백색 선택에 따른 비디오 카메라의 전달 특성" 대한전자공학회 논문지, 제41권, SP편, 제2호, pp.23-34, Mar. 2004.   과학기술학회마을
2 김은수, 장수욱, 이성학, 한찬호, 정태영, 송규익, "휴대폰용 CIS 디지털 카메라의 컬러 보정법" 대한전자공학회 논문지, 제43권, SP편, 제4호, pp. 9-18, July. 2006.   과학기술학회마을
3 The ANSI Accredited Standards Committee IT8, "Graphic technology-Color reflection target for input scanner calibration," American National Standards Institute, 1999.
4 J. Park, and K. Park, "Professional colour communicator-the definitive colour selector," Journal of the Society of Dyers and Colourist, Vol.111, pp. 56-57, 1995.
5 H. S. Kim, "Digital signal processor with efficient RGB interpolation and histogram accumulation," IEEE Transactions on Consumer Electronics, Vol.46, pp. 1389-1395, 1998.
6 G. Hong, M. R. Luo, and P. A. Rhodes, "A study of digital camera colorimetric characterization based on polynomial modeling," J. of Color Research and Application, Vol. 26, No.1, pp. 76-84, 2001.   DOI   ScienceOn
7 P. C. Hung, "Colorimetric calibration in electronic imaging devices using a look-up tables model and interpolations," Journal of Electronic Imaging, Vol.2, pp.53-61, 1993.   DOI
8 P. C. Hung, "Colorimetric calibration for scanners and media," Proc. SPIE, Vol.1448, pp.164-174, 1991.
9 H. R. Kang, "Colour scanner calibration," Journal of Imaging Science and Technology, Vol. 36, pp. 162-170, 1992.
10 H. R. Kang and P.G. Anderson, "Neural network application to the colour scanner and printer calibration," Journal of Electronic Imaging, Vol.1, pp. 125-134, 1992.   DOI
11 B. Grob, and C. E. Herndon, Basic Television and Video Systems, 6th Edition, 1999, Mc-Graw Hill, pp.70-71.
12 Y. H. Jung, J. S. Kim, B. S. Hur, and M. G. Kang, "Design of real-time enhancement preprocessor for CMOS image sensor," IEEE Transactions on Consumer Electronics, Vol.46, No.1, pp. 184-185, Feb. 2000.