Title :
A dual pixel-type imager for imaging and motion centroid localization
Author :
Clapp, Matthew ; Etienne-Cummings, Ralph
Author_Institution :
Dept. of Electr. & Comput. Eng., Johns Hopkins Univ., Baltimore, MD, USA
Abstract :
An imager chip has been designed, fabricated, and tested having two unique pixel types interleaved on the same array. The dual-pixel design enables optimization for two separate tasks. One type of pixel is an Active Pixel Sensor (APS), which is used to produce a low-noise image. The other type is a custom-designed pixel optimized for computing the centroid of a moving object in the scene. The APS array is 120 columns×36 rows, with a pixel size of 14.7 μm×14.7 μm. The centroid array has 60 columns and 36 rows, with a larger pixel size of 29.4 μm×29.4 μm. The chip was fabricated using standard scalable rules on a 0.7 μm CMOS process, with one polysilicon layer, 3 metal layers, and a linear capacitor layer. APS images were taken at a frame rate of 30 fps, and centroid data was taken at a rate of 180 (x,y) coordinates per second. The chip consumed 3.2 mW
Keywords :
CMOS image sensors; focal planes; low-power electronics; optical tracking; 0.7 micron; 14.7 micron; 29.4 micron; 3.2 mW; CMOS process; Si; active pixel sensor; centroid data; custom-designed pixel; dual pixel-type imager; frame rate; imager chip; linear capacitor layer; low-noise image; motion centroid localization; pixel size; polysilicon layer; standard scalable rules; CMOS image sensors; CMOS process; CMOS technology; Charge coupled devices; Circuit noise; Image quality; Image sensors; Layout; Pixel; Switches;
Conference_Titel :
Circuits and Systems, 2001. ISCAS 2001. The 2001 IEEE International Symposium on
Conference_Location :
Sydney, NSW
Print_ISBN :
0-7803-6685-9
DOI :
10.1109/ISCAS.2001.921357
