The picture quality of video frames encoded at very low-bit ratesoften suffers from both blocking and ringing artifacts. We present twopost-processing methods to mitigate the visual quality degradationcaused by these artifacts. To reduce the blocking artifact of decodedimages, we substitute IDCT for the lapped orthogonal transform embeddedinverse discrete cosine transform (le-IDCT). On the other hand, wepost-process the decoded video frames using a nonlinear robust filter toreduce the ringing artifact. Extensive simulation results indicatedsignificant improvement in both objective and subjective visualqualities. The computation overhead incurred due to these qualityenhancement operations is quite moderate, and can be easily optimized toachieve real-time operation
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