IEEE Trans Image Process - A bit allocation method for sparse source coding.

Tópicos

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Resumo

In this paper, we develop an efficient bit allocation strategy for subband-based image coding systems. More specifically, our objective is to design a new optimization algorithm based on a rate-distortion optimality criterion. To this end, we consider the uniform scalar quantization of a class of mixed distributed sources following a Bernoulli-generalized Gaussian distribution. This model appears to be particularly well-adapted for image data, which have a sparse representation in a wavelet basis. In this paper, we propose new approximations of the entropy and the distortion functions using piecewise affine and exponential forms, respectively. Because of these approximations, bit allocation is reformulated as a convex optimization problem. Solving the resulting problem allows us to derive the optimal quantization step for each subband. Experimental results show the benefits that can be drawn from the proposed bit allocation method in a typical transform-based coding application.

Resumo Limpo

paper develop effici bit alloc strategi subbandbas imag code system specif object design new optim algorithm base ratedistort optim criterion end consid uniform scalar quantiz class mix distribut sourc follow bernoulligener gaussian distribut model appear particular welladapt imag data spars represent wavelet basi paper propos new approxim entropi distort function use piecewis affin exponenti form respect approxim bit alloc reformul convex optim problem solv result problem allow us deriv optim quantiz step subband experiment result show benefit can drawn propos bit alloc method typic transformbas code applic

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