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Real-time 2D analog motion detector VLSI circuit

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4 Author(s)
Etienne-Cummings, R.R. ; Pennsylvania Univ., Philadelphia, PA, USA ; Fernando, S.A. ; Van der Spiegel, J. ; Mueller, P.

An analog VLSI implementation of real-time motion detection in early vision using a hybrid of the Reichardt and Ullman-Marr models has been fabricated. It has a 5×5 array of photoreceptors, with a receptor fill factor of 0.42. The majority of this circuit operates in strong inversion. The photosensors have squared logarithmic and linear responses for low and high intensity illumination, respectively. A linear passive resistive grid is used to implement the desired difference of Gaussian impulse response transfer function of the edge detection circuit whose dynamic range is 3 V. These outputs are used to determine the velocities of the translating objects. Velocities up to 2 m/s on chip corresponding to 6 m/s in space have been measured in 2D. The array has been fabricated in a 2 μm n-well CMOS process

Published in:

Neural Networks, 1992. IJCNN., International Joint Conference on  (Volume:4 )

Date of Conference:

7-11 Jun 1992