Patent ID: 8446431
Filing Date: 2013-05-21
Classification: G09G,H04N

Abstract:
1. In a blend zone that uses a blend curve for overlapping at least two projector images, a method of reducing visual artefacts, comprising: determining a maximum intensity variance for each block of pixels within said blend curve, said maximum intensity variance being based on a blend multiplier selected to achieve a net light intensity specific to the location of said block of pixels within said blend curve; for each block of pixels, determining a first adjusted blend multiplier wherein said blend multiplier is increased by at least a portion of said maximum intensity variance; for each block of pixels, determining a second adjusted blend multiplier wherein said blend multiplier is randomly decreased by said at least a portion of said maximum intensity variance; and adjusting the light intensity of each pixel in each said block of pixels using said first and second adjusted blend multipliers specific to each said block of pixels, such that the pixel intensity of each pixel is varied inversely while maintaining a group variance of approximately zero; wherein the average pixel intensity of each said block of pixels after application of said first and second adjusted blend multipliers remains equal to said net light intensity of said block of pixels within said blend curve while reducing patterning artefacts within said block of pixels.