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25 October 1988 Overlapping Block Transform For Image Coding Preserving Equal Number Of Samples And Coefficients
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Proceedings Volume 1001, Visual Communications and Image Processing '88: Third in a Series; (1988) https://doi.org/10.1117/12.969033
Event: Visual Communications and Image Processing III, 1988, Cambridge, MA, United States
Abstract
An approach to transform coding of images is presented, which uses overlapping blocks without increasing the number of coefficients. This is achieved by subsampling in the frequency domain, thus causing spatial domain aliasing in each block. This spatial domain aliasing is however cancelled out by an overlapping addition of the backward transform output of neighboring blocks. Conditions are stated, under which this aliasing cancellation property holds even when a spatial window function is incorporated into the transform. By the design of the window function, block boundary artefacts typical for conventional transform coding can be completely avoided. The application of 2-dimensional overlapping block transform (2D-OBT) to picture coding is examined, the nature and visibility of quantization errors in the case of lossy coding are analyzed. The incorporation of 2D-OBT in a low bitrate hybrid image sequence coding environment is described. Simulation results are presented, showing the achievable picture quality at 64 kBit/s using 2D-OBT as compared to DCT.
© (1988) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
H. Schiller "Overlapping Block Transform For Image Coding Preserving Equal Number Of Samples And Coefficients", Proc. SPIE 1001, Visual Communications and Image Processing '88: Third in a Series, (25 October 1988); https://doi.org/10.1117/12.969033
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