Error concealment for 3-D DWT based video codec using iterative thresholding
Belyaev, Evgeny; Forchhammer, Søren; Codreanu, Marian (2017-04-24)
E. Belyaev, S. Forchhammer and M. Codreanu, "Error Concealment for 3-D DWT Based Video Codec Using Iterative Thresholding," in IEEE Communications Letters, vol. 21, no. 8, pp. 1731-1734, Aug. 2017. doi: 10.1109/LCOMM.2017.2697428
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Error concealment for video coding based on a 3-D discrete wavelet transform (DWT) is considered. We assume that the video sequence has a sparse representation in a known basis different from the DWT, e.g., in a 2-D discrete cosine transform basis. Then, we formulate the concealment problem as l 1 -norm minimization and solve it utilizing an iterative thresholding algorithm. Comparing different thresholding operators, we show that video block-matching and 3-D filtering provide the best reconstruction by utilizing spatial similarity within a frame and temporal similarity between neighbor frames. Experimental results show that the proposed error concealment provides up to 6-dB improvement in the peak signal-to-noise ratio in comparison with existing recovery methods.
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