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Scene boundary detection is the essential step for video analysis such as retrieval, indexing, browsing and so on. There have been quite a lot of scene boundary detection methods for MPEG video streams and they work well. However, the variable size of macroblocks and more type information of macroblocks in H.264/AVC bitstreams make it different from MPEG bitstreams. Consequently, most of the algorithms...
Compressed video bit-streams are extremely sensitive to packet loss over error-prone channels. Error concealment (EC) has been considered as one of error control techniques to improve the reconstructed picture quality against transmission errors. However, EC methods show poor image reconstruction performance due to unavailable scene change information of the video sequence, especially when an abrupt...
Based on analyzing the algorithm of EZW, an improved image coding algorithm is presented. The wavelet coefficients are decomposed into two groups and coded separately. Meanwhile, the subordinate pass is removed and the location information of significant coefficients does not need to be kept in memory, So that the times of scan in the algorithm of the EZW are reduced. Thereby, the coding speed is...
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