Methods and apparatus of processing an undecoded document image in a digital computer to modify the document image so as to emphasize semantically significant portions without first converting the document image to character codes. The document image is segmented into image units, and morphological image...http://www.google.co.uk/patents/US5384863?utm_source=gb-gplus-sharePatent US5384863 - Methods and apparatus for automatic modification of semantically significant portions of a document without document image decoding
