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http://dx.doi.org/10.5392/JKCA.2013.13.10.054

Image Edge Detector Based on Analog Correlator and Neighbor Pixels  

Lee, Sang-Jin (충북대학교 전자정보대학 정보통신공학과)
Oh, Kwang-Seok (충북대학교 전자정보대학 정보통신공학과)
Nam, Min-Ho (충북대학교 전자정보대학 정보통신공학과)
Cho, Kyoungrok (충북대학교 전자정보대학 정보통신공학과)
Publication Information
The Journal of the Korea Contents Association / v.13, no.10, 2013 , pp. 54-61 More about this Journal
Abstract
This paper presents a simplified hardware based edge detection circuit which is based on an analog correlator combining with the neighbor pixels in CMOS image sensor. A pixel element of the edge detector consists of an active pixel sensor and an analog correlator circuit which connects two neighbor pixels. The edge detector shares a comparator on each column that the comparator decides an edge of the target pixel with an adjustable reference voltage. The circuit detects image edge from CIS directly that reduces area and power consumption 4 times and 20%, respectively, compared with the previous works. And also it has advantage to regulate sensitivity of the edge detection because the threshold value is able to control externally. The fabricated chip has 34% of fill factor and 0.9 ${\mu}W$ of power per a pixel under 0.18 ${\mu}m$ CMOS technology.
Keywords
Edge Detection; Analog Correlator; CMOS Image Sensor;
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Times Cited By KSCI : 1  (Citation Analysis)
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