In most current block-based image/video coding systems, the compression stage and the deblocking stage operate separately and hence they cannot make use of each other to optimise the overall coding performance. In this research, we suggest modifying the basic structure of the encoding systems such that the deblocking to be performed can be taken into account in the compression and the two processes can be jointly optimised. An example is also provided to show how this idea works successfully in a MPEG-4 codec to boost the ratedistortion performance when the suggested deblocking filter is exploited in the postprocessing stage. The modification does not change the bit stream format of the codec and hence is fully compatible with the original standard.This paper is a postprint of a paper submitted to and accepted for publication in IEE Proceedings-Vision, Image and Signal Processing and is subject to Institution of Engineering and Technology
Though post-processing is generally performed in JPEG /MPEG decoders to eliminate the blocking effect appeared in decoded images, few encoders will take care of it during compression. In this paper, we propose to take the post-processing stage into account when encoding an image and make use of it to improve the quality of the reconstructed images both subjectively and objectively. An example is also provided to show how this idea works successfully when classical low-pass filtering is exploited in the post-processing stage.
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