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Recent years have seen a great increase in the everyday use of real-time video communication over the internet through video conferencing applications. Limitations on computational resources and network bandwidth require video encoding algorithms that provide acceptable quality on low bitrates and can support various resolutions inside the same stream. In this work, the authors present a scalable...
Since wavelet-based image coding method suits digital image and video coding, it has been welcomed by video coding field. The BQ mode of MPEG-4's visual texture coding has adopted Predicative Embedded Zero-tree Wavelet Coding Algorithm (PEZW). Although in PEZW there is the germ of the unified scheme for fast EZW coding algorithm, it hasn't completely implemented the unified scheme. Thus, its algorithm...
An analysis-based approach for unequal loss-protected multiple description coding (packetization) of the scalable (prioritized / progressive) source code streams is proposed. For a given number of packets (descriptions) of the known size, unequal loss-protected packetization leads to segment the scalable code stream, such that the source can be reconstructed with the maximum possible fidelity at the...
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...
In this paper, we propose a novel error concealment algorithm for intra frames of h.264/AVC. By using the high correlation of adjacent frames sequence, the proposed algorithm performs quadratic interpolation to the error pixel value of the concealed intra frame from the corresponding pixels of the previously decoded frame and the adjacent blocks received correctly while remaining the least distortion...
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