DocumentCode :
3547795
Title :
A new switched capacitor circuit for parallel-pixel image processing [vision sensor integrated signal processing]
Author :
Massari, N. ; Viarani, N. ; Gottardi, M.
Author_Institution :
ITC-irst, Trento, Italy
fYear :
2005
fDate :
23-26 May 2005
Firstpage :
5902
Abstract :
A new switched capacitor (SC) circuit for image processing is presented. Optimized area occupancy and power consumption allow the integration of the proposed circuit into each pixel, in order to implement high speed pixel-parallel processing. The operation performed by the circuit consists of the accumulation of the absolute value of the difference between two voltage inputs, which is the base of a large set of image processing algorithms. Two circuit configurations have been developed and compared in this paper: a basic implementation and a second improved solution with higher sensitivity and linearity over the full output range. The improved pixel consists of 10 transistors and 3 capacitances and provides an output voltage range of 1.8 V with 3.3 V power supply. A test chip was fabricated in a 0.35 μm double-poly triple-metal CMOS process. The resulting 35 μm square pixel has a power consumption of 3 μW @ 3.3 V. The single absolute difference and accumulation is executed in 2 μs, which turns into a computing figure of 1.2 GOPS/mm2 and 1.3 TOPS/W.
Keywords :
CMOS image sensors; analogue processing circuits; image processing; parallel processing; switched current circuits; 0.35 micron; 1.8 V; 2 mus; 3 muW; 3.3 V; 35 micron; CMOS image sensors; analog processing block; parallel-pixel image processing; pixel-parallel processing; programmable image filtering; square pixel; switched capacitor circuit; vision sensor integrated signal processing; voltage inputs difference absolute value accumulation; Capacitive sensors; Energy consumption; Image processing; Image sensors; Linearity; Signal processing; Signal processing algorithms; Switched capacitor circuits; Switching circuits; Voltage;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Circuits and Systems, 2005. ISCAS 2005. IEEE International Symposium on
Print_ISBN :
0-7803-8834-8
Type :
conf
DOI :
10.1109/ISCAS.2005.1465982
Filename :
1465982
Link To Document :
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