Fast compression artifact reduction technique based on nonlinear filtering

A computationally e cient postprocessing technique to reduce compression artifacts in low-bit-rate video coding is proposed in this paper. Blocking and ringing e ects are two majors artifacts observed in block DCT-based codec, such as H.263, when coding at very low bit rates. Reduction of these artifacts can signi cantly improve the overall visual quality of decoded video. In this work, a new table-lookup method and a nonlinear ltering are proposed to remove the blocking and ringing e ects respectively. We have performed our experiments on TMN8.0 codec and H.263 anchor bitstream. It is shown by the results that the proposed approach can alleviate the compression artifacts e ciently with low computational complexity.