US Patent 9131136 Lens arrays for pattern projection and imaging

A method for imaging includes focusing optical radiation so as to form respective first and second optical images of a scene on different, respective first and second regions of an array of detector elements. The focused optical radiation is filtered with different, respective first and second passbands for the first and second regions. A difference is taken between respective first and second input signals provided by the detector elements in the first and second regions so as to generate an output signal indicative of the difference.