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Proceedings Paper

Sensor for optical flow measurement based on differencing in space and time
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Paper Abstract

Two CMOS image sensor concepts, developed for motion extraction, are proposed. The algorithm implemented in each pixel is either: the calculation of the temporal variation of the difference of the logarithm of intensity in two adjacent pixels; or a more general implementation of the spatial and temporal filtering over the local neighborhood. Temporal differencing yields peak in the response of pixels with changing intensity. The spatial differencing provides high-pass filtering and invariance to time-varying external lighting. We also compare two ways to use this sensor module to compute the velocity of edges moving along the sensor. In one implementation, the sensor is used as an input for a correlation algorithm, calculating the optical flow vector. The other possibility is to detect motion locally in each pixel, and measuring the time of switching between adjacent pixels which detect the motion.

Paper Details

Date Published: 25 March 1996
PDF: 11 pages
Proc. SPIE 2654, Solid State Sensor Arrays and CCD Cameras, (25 March 1996); doi: 10.1117/12.236090
Show Author Affiliations
Guy Meynants, Interuniv. Microelectronics Ctr. (Belgium)
Bart Dierickx, Interuniv. Microelectronics Ctr. (Belgium)
Danny Scheffer, Interuniv. Microelectronics Ctr. (Belgium)
Alexander I. Krymsky, Institute of Semiconductor Physics (United States)

Published in SPIE Proceedings Vol. 2654:
Solid State Sensor Arrays and CCD Cameras
Constantine N. Anagnostopoulos; Morley M. Blouke; Michael P. Lesser, Editor(s)

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