We describe the implementation of a non-contact motion encoder based on the Near-Sensor Image Processing (NSIP) concept. Rather than computing image displacements between frames we search for "LEP stability" as used successfully in a previously published Time-to-Impact detector. A LEP is a single pixel feature that is tracked during its motion. It is found that this results in a non-complex and fast implementation. As with other NSIP-based solutions, high dynamic range is obtained as the sensor adapts itself to the lighting conditions.
Åström Anders, Forchheimer Robert, "Fast, Low-Complex, Non-Contact Motion Encoder based on the NSIP Concept" in Proc. IS&T Int’l. Symp. on Electronic Imaging: Image Sensors and Imaging Systems, 2017, pp 91 - 95, https://doi.org/10.2352/ISSN.2470-1173.2017.11.IMSE-194