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For image display can be composed of two data sets, the definition of the first second groups of standard data sets and image regions to be avoided, the rest of dodge region and the image through a series of edge. The occurrence of any particular pixel in the original is determined by the first bit or control plane of the image data, whose state indicates that the appearance of the pixel is determined by one of the first or second data sets
Image processing method for dodging with softened edge transitionsUS5270806.pdf