Color-reproduction-driven CMOS image sensor design

Qun Sun; Hui Tian; Jim Li

doi:10.1117/12.597330

23 February 2005 Color-reproduction-driven CMOS image sensor design

Qun Sun, Hui Tian, Jim Li

Proceedings Volume 5678, Digital Photography; (2005) https://doi.org/10.1117/12.597330
Event: Electronic Imaging 2005, 2005, San Jose, California, United States

Abstract

Reducing crosstalk in small pixels has become one of the major efforts in CMOS image sensor design. In this paper, instead of focusing on lowering crosstalk, we explore the problem at color imaging system level. First we study the components that affect the spectral response of CMOS image sensor, including micro-lens, color filter, sensor quantum efficiency (QE), and spectral response shifts caused by crosstalk inside the sensor. This is performed using a commercial tool. Based on the results, a super-linear cross-talk function is constructed. A novel model for color reproduction of image sensor system under crosstalk is then proposed. Hypothetical spectral sensitivity method using smooth cubic spline function model with controllable peak positions and widths is applied to simulate the spectral sensitivity of color filters. The peaks and widths are optimized based on the μ-factor of spectral responses of image sensor system under different crosstalk level. It is found that, with crosstalk, the imaging system can still provide color production as good as, if not better than, the situation without crosstalk. The spectral sensitivity of color filters has to be slightly modified to compensate the effect of crosstalk. The overlaps of spectral responses of color filters should be slightly extended, which means in certain circumstances higher overlap of spectral sensitivities of color filters may be desirable to compensate the effect of crosstalk. Keywords: CMOS image sensor, QE, crosstalk, color reproduction, color filter, color filter array, μ-factor, spectral sensitivity

Citation Download Citation

Qun Sun, Hui Tian, and Jim Li "Color-reproduction-driven CMOS image sensor design", Proc. SPIE 5678, Digital Photography, (23 February 2005); https://doi.org/10.1117/12.597330

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KEYWORDS

Optical filters

Image sensors

CMOS sensors

Color reproduction

Monte Carlo methods

Imaging systems

Sensors

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