%0 Conference Proceedings
%4 sid.inpe.br/banon/2002/12.02.10.24
%2 sid.inpe.br/banon/2002/12.02.10.24.49
%@doi 10.1109/SIBGRAPI.2001.963051
%T Transform image coding with global thresholding: application to baseline JPEG
%D 2001
%A Zaid, Azza Ouled,
%A Olivier, Christian,
%A Olivier, Alata,
%A Marmoiton, François,
%E Borges, Leandro Díbio,
%E Wu, Shin-Ting,
%B Brazilian Symposium on Computer Graphics and Image Processing, 14 (SIBGRAPI)
%C Florianópolis, SC, Brazil
%8 15-18 Oct. 2001
%I IEEE Computer Society
%J Los Alamitos
%P 164-171
%S Proceedings
%1 SBC - Brazilian Computer Society
%K DCT, image coding, thresholding, modeling, quantization.
%X Many image compression schemes perform the discrete cosine transform (DCT) to represent an image in frequency space. An analysis of a suite of images confirms that the luminance AC coefficients can be modeled by a Laplacian distribution. The distribution model can be used to drop the insignificant coefficients. In this paper we develop an image-adaptive JPEG encoding algorithm that incorporate global thresholding and near optimal quantization approach based on Lagrangian multiplier. Simulation results demonstrate that, with our thresholding technique, we can improve the reconstructed image quality compared to the one provided by other DCT image coding schemes without thresholding.
%@language en
%3 164-171.pdf
%O The conference was held in Florianópolis, SC, Brazil, from October 15 to 18.