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13 October 1987 Two-Dimensional Hybrid Image Coding And Transmission
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Proceedings Volume 0845, Visual Communications and Image Processing II; (1987)
Event: Cambridge Symposium on Optics in Medicine and Visual Image Processing, 1987, San Diego, CA, United States
Image data compression is achieved through the use of a two-dimensional (2-D) transform operation on the gray-level pixels within an image subsection followed by 2-D DPCM encoding of common transform coefficients from disjoint image subsections. Earlier results for this 2-D hybrid scheme employing the Discrete Cosine Transform (DCT) indicate an overall improvement in image source coding gain vis-a-vis conventional 2-D transform coding. Hybrid system performance dependence on transform block size is demonstrated along with the rank-ordering of the relative performance obtained when using the Haar, Walsh, Slant and DCT 2-D orthogonal transforms. It is shown that performance gains over conventional block 2-D transform coding are realized for transforms which are less efficient than the DCT. This hybrid system will provide a means of substantially improving existing hardware transform coding systems with a minimal increase in hardware complexity.
© (1987) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
David G. Daut "Two-Dimensional Hybrid Image Coding And Transmission", Proc. SPIE 0845, Visual Communications and Image Processing II, (13 October 1987);

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