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Notice of retraction
Vol. 34, No. 8(3), S&M3042

Notice of retraction
Vol. 32, No. 8(2), S&M2292

Print: ISSN 0914-4935
Online: ISSN 2435-0869
Sensors and Materials
is an international peer-reviewed open access journal to provide a forum for researchers working in multidisciplinary fields of sensing technology.
Sensors and Materials
is covered by Science Citation Index Expanded (Clarivate Analytics), Scopus (Elsevier), and other databases.

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Sensors and Materials, Volume 17, Number 5 (2005)
Copyright(C) MYU K.K.
pp. 299-306
S&M608 Research Paper of Special Issue
Published: 2005

Analog Integrated Circuit for Edge Detection with Massively Parallel Processing Based on Vertebrate Outer Retina [PDF]

Yuzo Furukawa, Hiroo Yonezu, Shinya Sawa, Kimihiro Nishio, and Jang-Kyoo Shin

(Received December 6, 2004; Accepted January 14, 2005)

Keywords: analog integrated circuit, retina, edge detection, parallel processing, vision chip

An analog circuit for edge detection was proposed based on vertebrate outer retinas. In order to realize a wide dynamic range of light intensity, a simple logarithmic compression photocircuit based on a photoreceptor in the retina was utilized at the first stage of a unit circuit. A function for digitizing an output current was inserted at the last stage to solve the problem of incorrect operation caused by noise and device mismatches. The chip which contains 40×40 unit circuits in a two-dimensional array was fabricated with 0.35 µm complementary metal oxide semiconductor (CMOS) process. The measured results of the chip and the results with the simulation program with integrated circuit emphasis (SPICE) showed that edge positions can be detected correctly with a dynamic range of 6 decades. It was clarified that the fabricated chip can detect edge positions even if regions with extremely different brightness levels were contained in an input image. In addition, an edge pattern of a moving object was detected at 100 frames/s and the capability for massively parallel processing was confirmed.

Corresponding author: Yuzo Furukawa


Cite this article
Yuzo Furukawa, Hiroo Yonezu, Shinya Sawa, Kimihiro Nishio, and Jang-Kyoo Shin, Analog Integrated Circuit for Edge Detection with Massively Parallel Processing Based on Vertebrate Outer Retina, Sens. Mater., Vol. 17, No. 5, 2005, p. 299-306.



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