A simple and efficient error-diffusion algorithm
Proceedings of the 28th annual conference on Computer graphics and interactive techniques
IEEE Transactions on Consumer Electronics
Blocking effect reduction of JPEG images by signal adaptive filtering
IEEE Transactions on Image Processing
A postprocessing method for reducing quantization effects in low bit-rate moving picture coding
IEEE Transactions on Circuits and Systems for Video Technology
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A method is proposed for reducing the visibility of "contour artifacts," i.e., false contours resulting from color quantization in digital images. The method performs a multiscale analysis on the neighborhood of each pixel, determines the presence and scale of contour artifacts, and probabilistically dithers (perturbs) the color of the pixel. The overall effect is to "break down" the false contours, making them less visible. The proposed method may be used to reduce contour artifacts at the same bit depth as the input image or at higher bit depths. The contour artifact detection mechanism ensures that artifact-free regions remain unaffected during the process.