Time division multiplexed orthogonal stripes pattern projection for single frame surface inspection system

We have proposed surface inspection system for detecting small defects on painted surface. The system used frequency multiplexed orthogonal stripes, so that we can detect anisotropic defects. But there is a little cross talk that affects detection rate of tiny defects. In this paper, we propose time division multiplexed orthogonal stripes pattern projection under single exposure. It is enabled by correlation image sensor.