Abstract
Abstract Compression results obtained by using the three-dimensional discrete cosine transform are presented. The key aspects of the paper concern the adaptation to the 3D case of transform coding algorithms that are most often used in the 2D case. This work focussed on two particular aspects that are the original contribution of this paper: (i) the adaptation to the 3D case of transform coefficients quantization method; (ii) the application of an octree analysis algorithm before transform. The algorithm was especially designed for tomographic images issued from scintigraphic measures, we finally obtained a compression rate of 100 for a quality measured by a 40 dB PSNR.
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