Inverse sparse grid flood non-uniformity correction

摘要

We present a technique for the correction of spatial non-uniformity in an infrared emitter array projection system for flood scenes. The technique is a sparse grid approach, but, instead of turning on a sparse grid of emitters to estimate the radiance of each one, the array is commanded uniformly to a constant level, and a sparse grid of emitters is turned off. The resultant loss of radiance in the neighborhood of each emitter is used to estimate its response. Typically, less than one percent of the emitters are turned off in a grid, so flood scene effects, such as substrate heating, are accounted for without the complexity of coupled outputs of a full flood process.