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

Yusuke OIKE  Makoto IKEDA  Kunihiro ASADA  

IEICE TRANSACTIONS on Electronics   Vol.E87-C    No.12    pp.2164-2171
Publication Date: 2004/12/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Electronic Circuits
image sensor,  pixel-level color imaging,  modulated RGB flashlight,  object extraction,  time-of-flight range finding,  image recognition,  

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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 6464 pixels using a 0.35 µm CMOS process. Color image reconstruction and time-of-flight range finding have been performed for the feasibility test.