Performance of optical flow techniques
International Journal of Computer Vision
Compact Integrated Motion Sensor With Three-Pixel Interaction
IEEE Transactions on Pattern Analysis and Machine Intelligence
Winner-Take-All Networks with Lateral Excitation
Analog Integrated Circuits and Signal Processing
Green Theorems and Qualitative Properties of the Optical Flow
Green Theorems and Qualitative Properties of the Optical Flow
A Current-Mode Hysteretic Winner-take-all Network, with Excitatory and Inhibitory Coupling
Analog Integrated Circuits and Signal Processing
Winner-Take-All Networks with Lateral Excitation
Analog Integrated Circuits and Signal Processing
High Time-Resolution Visual Motion Detection with Time Stamped Pixel Design
Analog Integrated Circuits and Signal Processing
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Compact analog VLSI velocity sensors, with on-board photoreceptor arrays, invariant to absolute illuminance and stimulus contrast, that signal reliably over large ranges of magnitude in speed, have been recently proposed. In this article we make use of such analog velocity sensors at the system level. Specifically, we discuss three chips that integrate and process the measured velocity vectors for locating the "Focus of Expansion," "Motion Discontinuities" and for computing the "Time to Contact". We describe the functionality of their component modules and their principles of operation. Data measurements obtained from the developed VLSI chips demonstrate their correct performance and their limits of operation.