Standard dct-based video coding techniques perform good results in terms of data compaction, making feasible the use of digital video in several application frameworks. The price to pay is the introduction of annoying...
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ISBN:
(纸本)0780374029
Standard dct-based video coding techniques perform good results in terms of data compaction, making feasible the use of digital video in several application frameworks. The price to pay is the introduction of annoying visual distortions/artefacts in the reconstructed video, The lower the encoding bit-rate, the larger the number of artefacts. Post-processing is a practical solution that achieves a visual enhancement of the compressed images after decoding. Some of the artefacts, such as blocking (tiled-effect aspect) and ringing (ghost effect) have already been widely studied. Therefore, this paper focuses on a novel post-processing technique, that reduces a temporal phenomenon known as "mosquito noise" ("flying bunch of mosquitoes" aspect). This temporal "busyness" is discarded by applying in the frequency domain an adaptive temporal filtering that preserves sharpness and naturalness of the reconstructed video signal. The proposed algorithm. is straightforward, painless to implement, and effective: experimental results show that the presented temporal post-filtering process improves significantly the visual quality of video.
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