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Smoothing DCT compression artifacts (1994)
Image compression based on quantizing the image in the discrete cosine transform (DCT) domain can generate blocky artifacts in the output image. It is possible to reduce these artifacts and RMS error by adjusting measures of block edginess and image roughness, while restricting the DCT coefficient values to values that would have been quantized to those of the compressed image. We also introduce a DCT coefficient amplitude adjustment that reduces RMS error.
artifacts, compression, DCT, image, Smoothing
SID Digest, ed. J. Morreale, 25, 708-711
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