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 » ... 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