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本文提出一种采用WRGB彩色滤光片阵列（每个2x2块包含两个白色像素）的CMOS图像传感器，结合宽动态范围技术，解决了传统白色像素在低光下饱和导致动态范围不足的问题，同时提高了信噪比。
mobile phone cameras. But, when very small pixel sizes are used, the sensor SNR is limited by photon shot noise. In order to improve the sensor SNR Honda [1] and Luo [2] proposed the use of a sensor with a white (W) pixel in the color filter area. The white pixel, however, saturates at low light levels and sufficient dynamic range cannot be obtained as a result. In order to overcome the dynamic range problem, we propose a CIS with a WRGB color filter array (two white pixels per 2×2 block) incorporating the wide dynamic-range (WDR) technology presented in [3-5]. Our proposed implementation makes possible further improvements in SNR over previous work and increases the dynamic range for both high and low illumination. Our sensor architecture does not require additional elements in the pixels
Yoshitaka Egawa, Nagataka Tanaka, Nobuhiro Kawai, Hiromichi Seki,
Akira Nakao, Hiroto Honda, Yoshinori Iida, Makoto Monoi Toshiba, Kanagawa, Japan Continued reductions in pixel size in CMOS image sensors (CIS) is important for