Obtenção de tabela de quantização para compressão de imagens utilizando algoritmos genéticos

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

The purpose of this work is to generate a better Quantization Table for a group of natural images and medical images using the Genetic Algorithm method in the process of compression JPEG. The fitness function of the population will be analyzed and the probability of selection the better pairs of chromosomes or matrix, and we will also breach means to improve the results through modifications of the input parameters. In the previous processing of the coded image it is necessary to know very well the Quantization Table to achieve an image with less loss and therefore, better final quality. The method of Genetic Algorithm applied to this program is based on mechanisms of natural selection and reproduction for a set of natural and medical images and furthermore it allowed for the creation of not one but various Tables with SNR higher than those produced by the JPEG Table since it stimulated the principal characteristics of this method in programming such as: codification of defined parameters; the process of search for better matrix starting from a group of matrix and not a simple matrix; information obtained of an objective determined function (fitness function) and the use of the probabilistic rules of transition. Based on the results obtained in this work, we can recommend the use of Genetic Algorithm for natural images and human eye images with a compression rate up to 30:1 and a great reconstructed image quality.

ASSUNTO(S)

relação sinal/ruído engenharia eletrica signal noise relation algoritmo genético função de aptidão genetic algorithm fitness function seleção natural algoritmos genéticos natural selection

ACESSO AO ARTIGO

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