Patent ID: 8570405
Filing Date: 2013-10-29
Classification: G02B,H04N

Abstract:
1. A system for operating on a stream of light, the system comprising: a light modulation unit configured to modulate the light stream with a series of spatial patterns in order to produce a modulated light stream, wherein the light modulation unit includes a plurality of light modulating elements configured to modulate corresponding portions of the light stream, wherein each of the spatial patterns specifies an amount of modulation for each of the light modulating elements, wherein the series of spatial patterns includes first patterns and calibration patterns; a light sensing device configured to receive the modulated light stream and to generate a sequence of samples representing intensity of the modulated light stream as a function of time; and a processing unit configured to separate the sequence of samples into a first subsequence of samples that correspond to the first patterns and a second subsequence of samples that correspond to the calibration patterns, wherein the second subsequence of samples represents variation in background light level.