Let's Make Robots!

optical flow

Simple 4 pixel camera sensor

In the following I describe a simple 4 pixel camera sensor, which can be versatilely used in robotics.

The sensor consists in general of four pin photo diodes with a relatively large photo sensitive area, arranged in a square, and an according collimator lens. Every photo diode can be thought of a quadrant of a two dimensional graph. We can use the sensor to measure the intensity of light, detect motions, track a light source in two dimensions or do basic 2-D optical flow calculations.