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The warped discrete cosine transform (WDCT) has been shown to improve the compression performance compared to standard DCT for image compression at high bit rates. In the proposed approach, the WDCT parameters are embedded into the transform coefficients for low bit rates in the form of a watermark to avoid the WDCT parameter side information overhead, improving the compression performance for low bit rates. Furthermore, optimal postprocess filtering, with filter coefficients being determineddoi:10.1109/tcsvt.2008.918769 fatcat:nndxq3takjg35g5vdc4wwmbqxu