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AbstractDirectionlets are built as basis functions of critically sampled perfect-reconstruction transforms with directional vanishing moments imposed along different directions. We combine the directionlets with the space-frequency quantization (SFQ) image compression method, originally based on the standard two-dimensional wavelet transform. We show that our new compression method outperforms the standard SFQ as well as the state-of-the-art image compression methods, such as SPIHT and JPEG-2000, in terms of the quality of compressed images, especially in a low-rate compression regime. We also show that the order of computational complexity remains the same, as compared to the complexity of the standard SFQ algorithm.
CitationVelisavljevic, V., Beferull-Lozano, B. and Vetterli, M. (2007) 'Efficient image compression using directionlets', 6th International Conference on Information, Communications & Signal Processing, Singapore, 10-13 December. Singapore: IEEE, pp.1-5.
TypeConference papers, meetings and proceedings