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10 January 1997 Image compression algorithm using local edge information
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Proceedings Volume 3024, Visual Communications and Image Processing '97; (1997)
Event: Electronic Imaging '97, 1997, San Jose, CA, United States
An algorithm for image compression, based on local histogram analysis, is presented. A given image is compressed by dividing the image into nonoverlapping square blocks and coding the edge information in each block. The edge information is extracted by first differentiating the original image, quantizing the differential image, then investigated the local histogram of small blocks of the differential image. Depending on the behavior of the local histograms in the differential image, the corresponding blocks in the original image are classified into visually active and visually continuous blocks. The visually continuous blocks are coded using the mean value only. A visually active block is coded using the location and orientation of the edge within the block. As a result, the compression ratio of the proposed algorithm depends on the behavior of the local histogram, which in turn depends heavily on the quantization process of the differential image. In this paper, the effect of the quantization of the differential image on the compression ratio and the image quality is discussed.
© (1997) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ahmed El-Mabrouk and Amar Aggoun "Image compression algorithm using local edge information", Proc. SPIE 3024, Visual Communications and Image Processing '97, (10 January 1997);

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