22 August 1995 Study of edge-based lossy image compression algorithms
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The visual pattern image coding (VPIC) technique appears to be a powerful competitor to VQ approaches for image coding since no codebook is needed. In VPIC, edge patterns within 4 by 4 blocks are detected and preserved. We report on the results of an alternative edge-preserving lossy compression algorithm that employs an edge-detection operator for identifying edge pixels for special treatment. A combination of the zero-tree approach of subband coding and the deterministic prediction approach of JBIG identified blocks without edge pixels. Predictive coding is heavily employed in compressing the block mean values. A smoothing algorithm is applied to the means of the 4 by 4 blocks that serves the dual purpose of predicting whether an edge pixel value is above or below the mean.
© (1995) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
James M. Spring, James M. Spring, Glen G. Langdon, Glen G. Langdon, } "Study of edge-based lossy image compression algorithms", Proc. SPIE 2564, Applications of Digital Image Processing XVIII, (22 August 1995); doi: 10.1117/12.217388; https://doi.org/10.1117/12.217388

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