A CMOS Optical Sensor which Counts the Number of Objects (特集 集積化・知能化センサとその要素技術)

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概要

• 論文の詳細を見る

• A CMOS optical sensor which measures the number and the size of objects has been designed and successfully tested. The sensor contains an array of 24×14 pixels in a chip area of 6.8mm×4.6mm. The sensor first performs image digitization by comparing a photogenerated current with a given threshold. A Winner-Take-All (WTA) operation is carried out next in each object region which is defined as a collection of illuminated pixels mutually connected in either a horizontal or a vertical direction. Realization of the WTA circuit with sharp selectivity makes it possible to select only one winner from each object by utilizing inherent mismatch in transistor characteristics. The output current of the winning pixel represents the object size; the number of winning pixels represents the number of objects. The use of an analog WTA circuit contributed to simple implementation. The sensor operated successfully for images in which the sizes of objects were equal to or smaller than 4×4 pixels.

• 社団法人 電気学会の論文
• 2000-05-01

著者

• Spiegel Jan

  University Of Pennsylvania

• Nishimura M

  Yazaki Corp.

• Nishimura Masatoshi

  Sankyo Co. Ltd

関連論文

• An Optical Feature Detection Sensor Based on Orientation Decomposition (特集 集積化・知能化センサとその要素技術)
• A CMOS Optical Sensor which Counts the Number of Objects (特集 集積化・知能化センサとその要素技術)
• A smart optical sensor : On-chip feature detection

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