ENHANCEMENT OF IMAGES IN THE TRANSFORM DOMAIN / REALCE DE IMAGENS NO DOMÍNIO DA TRANSFORMADA

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

This Dissertation is aimed at the development of new enhancement techniques applied in the transform domain. The study of the bidimensional transforms motivated the development of techniques based on these mathematical tools. The comparative analysis between the enhancement methods in the spatial domain and in the transform domain revealed the advantages of the use of transforms. A new proposal of enhancement in the Discrete Cosine Transform (DCT) domain is analysed. The results showed that this new proposal is less affected by noise and enhances more the image than other techniques reported in the literature. In addition, a strategy to eliminate the darkening effect of enhancement by Alpha-rooting is considered. A new proposal of enhancement in the Discrete Wavelet Transform (DWT) domain is also presented. Simulation results showed that the enhanced images have better visual quality than other ones presented in the literature and is less affected by noise. Moreover, the choice of the enhancement parameter is simplified.

ASSUNTO(S)

imagem image ruido transform domain histograms realce compressao compression histogramas enhancement dominio da transformada noise

ACESSO AO ARTIGO

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