A Digital Pixel Sensor (DPS) based CMOS camera configured to record frames and comprising an event detection sensor configured to look for an event happening in a determined frame, comprising an array of event detection pixels, a first reference voltage generator, first row and column arbiters, and first row and column address encoders; the DPS based CMOS camera further comprises a change detection sensor configured to look for a change happening in between frames, comprising an array of change detection pixels, a second binary search value generator, second row and column arbiters, and second row and column address encoders.