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

Guy Meynants; Bart Dierickx; Danny Scheffer; Alexander I. Krymsky

doi:10.1117/12.236090

25 March 1996 Sensor for optical flow measurement based on differencing in space and time

Guy Meynants, Bart Dierickx, Danny Scheffer, Alexander I. Krymsky

Proceedings Volume 2654, Solid State Sensor Arrays and CCD Cameras; (1996) https://doi.org/10.1117/12.236090
Event: Electronic Imaging: Science and Technology, 1996, San Jose, CA, United States

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.

Citation Download Citation

Guy Meynants, Bart Dierickx, Danny Scheffer, and Alexander I. Krymsky "Sensor for optical flow measurement based on differencing in space and time", Proc. SPIE 2654, Solid State Sensor Arrays and CCD Cameras, (25 March 1996); https://doi.org/10.1117/12.236090

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KEYWORDS

Sensors

Optical flow

Photodiodes

Motion measurement

Image filtering

Motion detection

Capacitors

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