Title :
Histogram-equalization-based adaptive image sensor for real-time vision
Author :
Ni, Yang ; Devos, Francis ; Boujrad, Mohammed ; Guan, Jian Hong
Author_Institution :
Inst. Nat. des Telecommun., Evry, France
fDate :
7/1/1997 12:00:00 AM
Abstract :
Image sensing and coding are essential to vision machines. This paper presents an adaptive image sensor by using in situ histogram equalization. With this histogram-equalization-based adaptation, this image sensor can adapt automatically to different lighting conditions without frame delay and provides a constant image signal excursion range. A CMOS prototype chip of 64×64-pixel is presented where each pixel contains ten transistors and occupies 50×50 μm2 in a classic 1-μm double-metal single-poly process. The experimental results confirm an adaptation over illumination variation of 1:5000
Keywords :
CMOS integrated circuits; computer vision; image sensors; real-time systems; 1 micron; 64 pixel; CMOS chip; adaptive image sensor; double-metal single-poly process; histogram equalization; real-time vision; CMOS image sensors; CMOS process; Charge coupled devices; Charge-coupled image sensors; Dynamic range; Image converters; Image sensors; Lighting; Noise level; Photodiodes;
Journal_Title :
Solid-State Circuits, IEEE Journal of
