Analysis and design of a CMOS angular velocity- and direction-selective rotation sensor with a retinal processing circuit

Kuan Hsun Huang*, Li Ju Lin, Chung-Yu Wu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

This paper implements and analyzes a CMOS angular velocity- and direction-selective rotation sensor with a retinal processing circuit. The proposed rotation sensor has a polar structure and is selective of the angular velocity and direction (clockwise and counterclockwise) of the rotation of images. The correlation-based algorithm is adopted and each pixel in the rotation sensor is correlated with the pixel that is 45° apart. The angular velocity selectivity is enhanced by placing more than one pixel between two correlated pixels. The angular velocity selectivity is related to both the number and the positions of the edges in an image. Detailed analysis characterizes angular velocity selectivity for different edges. An experimental chip consisting 104 pixels, which form five concentric circles, is fabricated. The single pixel has an area of 91 × 84 μm2 and a fill factor of 20%, whereas the area of the chip is 1812 × 1825 μm 2. The experimental results concerning the fabricated chip successfully verified the analyzed characteristics of angular velocity and direction selectivity. They showed that the detectable angular velocity and range of illumination of this rotation sensor are from 2.5 × 10 -3 π/s to 40 π/s and from 0.91 lux to 366 lux, respectively.

Original languageEnglish
Pages (from-to)845-856
Number of pages12
JournalIEEE Sensors Journal
Volume4
Issue number6
DOIs
StatePublished - 1 Dec 2004

Keywords

  • Focal-plane motion sensor
  • Motion sensor
  • Retinal processing circuit
  • Rotation sensor
  • Vision chip

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