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This article describes an application of differential prediction coding to data compression of digital image with gray levels using bilinear surface patches. The region on which a image is defined is subdevided into nonuniform blocks, and the luminance values in a block are approximated by bilinear surface patch constracted by the luminance values at the four corners of the block. We propose four methods to predict luminance value at the block's corner. Our coding method provides higher quality at low bitrate than JPEG method.