Pre and post-filtering for low bit-rate video coding
ICIP '97 Proceedings of the 1997 International Conference on Image Processing (ICIP '97) 3-Volume Set-Volume 1 - Volume 1
De-noising by soft-thresholding
IEEE Transactions on Information Theory
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When compressing video sequences, noise is fatal to compression performance. Imaging is inherently a noisy process since the number of photons hitting a detector is a statistical process. When scene illumination is high, the statistical nature of the number of photons hitting each detector is of no importance, since other effects such as quantization dominate. For other applications, military for example, where the imaging has to be done with whatever illumination is naturally available, the noise can be both annoying for the observer and make transmission of the imagery consume excessive amounts of bandwidth. We show results of using content based spatial prefiltering combined with motion vector certainty controlled temporal prefiltering to reduce the noise and thus improve both visual impression and transmission properties.