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Compression of Binary Images by Composite Methods Based on Block Coding

✍ Scribed by Pasi Fränti; Olli Nevalainen

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
516 KB
Volume
6
Category
Article
ISSN
1047-3203

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✦ Synopsis

Composite methods for compressing binary images are studied. Hierarchical block coding is the main component in all of them. An attempt is made to increase the compression by augmenting the block coding by predictive coding and bit row reordering. The purpose is to increase the number of white pixels and all-white blocks. An error image is constructed from the differences between the predicted and original values of the pixels. The error image is then codecl by hierarchical block coding, in which Huffman coling is used to encode the different bil patterns at the lowest level of the hierarchy. In the method, the global level dependencies are thus laundled by block coding and the local pixel-to-pixel dependencies by Huffman coding. 1995 Academic Press, fuc.

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