Faculté des sciences

Color Image Compression with a Variable Block-Size Transform Scheme

Bracamonte, Javier ; Ansorge, Michael ; Pellandini, Fausto

In: Proceedings of the International COST 254 Workshop on Intelligent Communication and Multimedia Terminals, 1998, vol. 254, p. 7-10

In a previous paper an adaptive transform-based coding method was introduced and used for the particular application of compressing the monochrome images of video conference sequences [1]. In the present paper the results of applying this adaptive scheme to compress still color images are presented. The basic principle of the algorithm is to encode those larger 2N x 2N -pixel regions featuring... Plus

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    Summary
    In a previous paper an adaptive transform-based coding method was introduced and used for the particular application of compressing the monochrome images of video conference sequences [1]. In the present paper the results of applying this adaptive scheme to compress still color images are presented. The basic principle of the algorithm is to encode those larger 2N x 2N -pixel regions featuring low image activity with a single 2N- point transform, and code high activity 2N x 2N- pixel regions with four N- point transform operations. Regarding the implementation issues, a strategy to reduce the computational complexity of the algorithm is also discussed.