1
William B Pennebaker, Karen L Anderson, Joan L V Mitchell: Compression of binary halftones. International Business Machines Corporation, Thomas P Dowd, October 23, 1990: US04965677 (21 worldwide citation)

A system is described for reformatting halftone data for compression, wherein an original bilevel image is reformatted to produce another bilevel image that allows vertical correlations to be recognized by the compression technique, thus improving compressibility dramatically, with particular suitab ...


2
Joan L V Mitchell, Karen L Anderson, Frederick C Mintzer: Image rotation method. International Business Machines Corporation, George E Clark Terry J Ilardi, August 25, 1987: US04689824 (18 worldwide citation)

A method for rotation of a binary image by 180 degrees, includes the steps of: positioning first and second address pointers at the center of at the beginning and end respectively of an image to be rotated; indexing the first pointer in a first direction through said image; indexing the second point ...