Please use this identifier to cite or link to this item: http://repositorio.ufpa.br:8080/jspui/handle/2011/9621
Title: Transformada seno discreta com rotação de eixos bidimensional (DSTr -2D): aplicações na codificação e interpolação de imagens para redução de efeito de blocos
metadata.dc.creator: PELAES, Evaldo Gonçalves
Keywords: Processamento de imagens
Interpolação
Issue Date: 29-Oct-1998
Publisher: Universidade Estadual de Campinas
Citation: PELAES, Evaldo Gonçalves. Transformada seno discreta com rotação de eixos bidimensional (DSTr -2D): aplicações na codificação e interpolação de imagens para redução de efeito de blocos. 1998. 143 f. Tese (Doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação, Campinas, 1998. Programa de Pós-Graduação em Engenharia Elétrica. Disponível em: <http://repositorio.ufpa.br/jspui/handle/2011/9621>. Acesso em:.
Abstract: This work presents a new tool for image coding and image interpolation based on the two-dimensional discrete sine transform with axis rotation (DSTr-2D). The main characteristics of this transform are the few blocking effects found in the reconstructed image and its computational simplicity. In this work, the DSTr-2D is applied to image interpolation and its performance is compared with results obtained from DCT. A method of interpolation using DCT without extrapolation is also presented. The DSTr-2D achieves a performance better than the other interpolation methods used for comparison purposes. Indeed the better performance is obtained when the sample rate is increased. The DSTr-2D is also applied to the image coding, and it was verified that its advantage relative to DCT in terms of blocking effects in the reconstructed image. The results obtained in image coding using DSTr-2D are compared with results obtained from DCT and LOT. The images were coded using scalar, gaussian, laplacian and Lloid-Max quantization Finally, the DSTr-2D is applied to performs the image coding and the image interpolation, simultaneously.
URI: http://repositorio.ufpa.br/jspui/handle/2011/9621
Appears in Collections:Teses em Engenharia Elétrica (Doutorado) - PPGEE/UNICAMP

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