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<p><b>Abstract</b>—An integrated circuit with on-chip photoreceptors is described, that computes the bi-directional velocity of a visual stimulus moving along a given axis in the focal plane by measuring the time delay of its detection at two positions. Due to the compactness of the circuit, a dense array of such motion-sensing elements can be monolithically integrated to estimate the velocity field of an image and to extract higher-level image features through local or global interaction.</p>
Motion estimation, velocity sensor, optical flow, analog VLSI, robot vision.

J. Kramer, "Compact Integrated Motion Sensor With Three-Pixel Interaction," in IEEE Transactions on Pattern Analysis & Machine Intelligence, vol. 18, no. , pp. 455-460, 1996.
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