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Adaptive modulation and coding (AMC) is one of the main advantage of the WiMAX system in broadband wireless access (BWA) applications. The system changes modulation and coding to provide high quality of service. This feature is especially attractive for services like on demand video and image transmission. The physical layer of system monitors the channel condition and estimating signal to noise ratio...
In this paper, we propose an image coding approach using wavelet-based adaptive contourlet transform. The approach adopts the wavelet transform to implement subband decomposition to replace Laplace pyramid decomposition in contourlet transform, and thus the redundancy caused by the Laplace pyramid decomposition can be eliminated. Moreover, it chooses the directional filter banks as a key technique,...
Region based coding is an important feature in todaypsilas image coding techniques as it follows different regions of the image will be encoded at different bit rates and hence at different qualities rather than encoding the entire image with a single quality constraints. This paper evaluates the features of using shape adaptive wavelet transform for the region based coding of the brain magnetic resonance...
An improved fine granular adaptive video coding algorithm based on fine granular scalable (FGS) is presented in this paper, which chooses high quality reference in enhancement layer coding, and uses the leaky prediction techniques which can control error propagation by the leaky factor. The simulation and experiments indicate that the proposed scheme can make a better trade-off between the coding...
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