Low-complexity error concealment techniques for missing macroblock (MB) recovery in mobile video delivery based on the boundarymatching principle is extensively studied and evaluated in this work. We first examine th...
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ISBN:
(纸本)9780819468444
Low-complexity error concealment techniques for missing macroblock (MB) recovery in mobile video delivery based on the boundarymatching principle is extensively studied and evaluated in this work. We first examine the boundarymatchingalgorithm (BMA) and the outer boundary matching algorithm (OBMA) due to their excellent trade-off in complexity and visual quality. Their good performance is explained, and additional experiments are given to identify their strengths and weaknesses. Then, two more extensions of OBMA are presented. One is obtained by extending the search pattern for performance improvement at the cost of additional complexity. The other is based on the use of multiple overlapped outerboundary layers.
Low-complexity error concealment techniques for mobile applications are studied extensively in this paper. The boundarymatchingalgorithm (BMA) is an attractive choice for mobile video concealment due to its low comp...
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Low-complexity error concealment techniques for mobile applications are studied extensively in this paper. The boundarymatchingalgorithm (BMA) is an attractive choice for mobile video concealment due to its low complexity. Here, we examine a variant of BMA called the outer boundary matching algorithm (OBMA). Although BMA and OBMA are similar in their design principle, it is empirically observed that OBMA outperforms BMA by a significant margin (typically, 0.5dB or higher) while maintaining the same level of complexity. In this work, we attempt to explain the superior performance of OBMA, and conclude that OBMA provides an excellent trade off between the complexity and the quality of concealed video for a wide range of test video sequences and error conditions.
Error concealment is a useful method for improving the damaged video quality in the decoder side. In this paper, a dynamic method with low computational complexity is presented to improve the visual quality of videos ...
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ISBN:
(纸本)9781467361842
Error concealment is a useful method for improving the damaged video quality in the decoder side. In this paper, a dynamic method with low computational complexity is presented to improve the visual quality of videos when up to 50% of the frames are damaged. In the proposed method, temporal replacement and the improved outer boundary matching algorithm are used for dynamical error concealment in interframes of videos. With the use of motion vectors (MVs) which are close to the damaged macroblock (MB) the method can determine whether the motion in specific areas is either regular, irregular, or zero. Then, based on this knowledge, different methods are performed. It adaptively selects a set of candidate MVs and external boundaries for comparison purposes. Furthermore, to increase the accuracy, depending on the correctness of adjacent MVs, a specific weight is given to the boundaries of adjacent MBs. Experimental results show that the proposed method enhances both objective and subjective quality of damaged frames without any considerable increase in complexity. The average PSNR in some frames of test sequences has increased about 1.01 dB more than the outer boundary matching algorithm.
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