Rate-distortion optimized image compression using wedgelets

M. Wakin, J. Romberg, Hyeokho Choi, R. Baraniuk
Proceedings. International Conference on Image Processing  
Most wavelet-based image coders fail to model the joint coherent behavior of wavelet coefficients near edges. Wedgelets offer a convenient parameterization for the edges in an image, but they have yet to yield a viable compression algorithm. In this paper, we propose an extension of the zerotree-based Space-Frequency Quantization (SFQ) algorithm by adding a wedgelet symbol to its tree-pruning optimization. This incorporates wedgelets into a ratedistortion compression framework and allows
more » ... k and allows simple, coherent descriptions of the wavelet coefficients near edges. The resulting method yields improved visual quality and increased compression efficiency over the standard SFQ technique. ple comparing SFQ and W-SFQ performance. Finally, Section 6 offers conclusions and extensions to our current implementation. WEDGELETS
doi:10.1109/icip.2002.1038949 dblp:conf/icip/RombergWCB02 fatcat:yvanwhr475d2for4oimbecsuki