Pixel-Level Color Demodulation Image Sensor for Support of Image Recognition

摘要

In this paper, we present a pixel-level color image sensor with efficient ambient light suppression using a modulated RGB flashlight to support a recognition system. The image sensor employs bidirectional photocurrent integrators for pixel-level demodulation and ambient light suppression. It demodulates a projected flashlight with suppression of an ambient light at short intervals during an exposure period. In the imaging system using an RGB modulated flashlight, every pixel provides innate color and depth information of a target object for color-based categorization and depth-key object extraction. We have designed and fabricated a prototype chip with 64 x 64 pixels using a 0.35μm CMOS process. Color image reconstruction and time-of-flight range finding have been performed for the feasibility test.