A method and apparatus for compressing images having a binary extractor, a binary compressor and a JPEG compressor. The binary extractor produces a binary image representing an estimate of the binary information in the original image. The binary image is compressed by the binary compressor. The binary...http://www.google.com/patents/US5432870?utm_source=gb-gplus-sharePatent US5432870 - Method and apparatus for compressing and decompressing images of documents
