An Efficient DCT Filter Using Four Adjacent Shift Blocks.

Blocking effect is the major drawbacks in DCT-based codec at low bit-rate. This kind of degradation probably will affect the judgment of a final user. In this paper, a powerful post-processing filter is proposed in DCT frequency domain. The proposed algorithm uses a shift block within four adjacent DCT blocks to reduce computational complexity. By slightly modifying several DCT coefficients in the shift block, the artifacts that result from quantized and de-quantized process are alleviated. In our simulation results, our scheme can take best quality in both objective and subjective metrics. [ABSTRACT FROM AUTHOR]