1
Gordon W Braudaway, Karen A Magerlein, Frederick C Mintzer: Color correct digital watermarking of images. International Business Machines Corporation, Richard M Ludwin, June 25, 1996: US05530759 (366 worldwide citation)

A system for placing a visible "watermark" on a digital image is disclosed, wherein an image of the watermark is combined with the digital image. The pixels of the watermark image are examined, and for each pixel whose value is not a specified "transparent" value, the corresponding pixel of the orig ...


2
Yi Hsin Chen, Frederick C Mintzer, Keith S Pennington: System for reproducing mixed images. International Business Machines Corporation, Thomas P Dowd, May 26, 1987: US04668995 (116 worldwide citation)

An electronic processing system for reproducing mixed images, i.e., original images having areas of continuous tone and areas of text, in such a manner that both areas are of balanced, good quality in the reproduction. The image to be reproduced is (1) divided into non-overlapping 4.times.4 blocks o ...


3
Gordon W Braudaway, Marco Martens, Frederick C Mintzer, James B Shearer, Charles P Tresser, Chai W Wu: Watermarks for customer identification. International Business Machines Corporation, Stephen C Kaufman, Whitham Curtis & Christofferson P C, October 19, 2004: US06807634 (38 worldwide citation)

A digital watermarking method encodes different pairs of watermarks into each of a plurality of images offered for use by a vendor. The watermarks in each pair are derived from two separate collections of watermarks and sufficiently different so as to prevent false positives. Because each pair of wa ...


4
Frederick C Mintzer, Karen L Anderson: Image reduction method. International Business Machines Corporation, Thomas P Dowd, December 8, 1987: US04712140 (32 worldwide citation)

A binary image is reduced in size by a method including the steps of: storing the image in bit sequence; dividing the image into transposable blocks; transposing by look up table, for each block having any nonzero data, each group of 6 bits along a first axis to a group of 5 bits; transposing by loo ...


5
Karen L Anderson, Frederick C Mintzer, Gerald Goertzel: Method for enlarging a binary image. December 23, 1986: US04631751 (30 worldwide citation)

A method for enlarging a binary image by an arbitrary factor includes the steps of storing the image in bit sequence; rotating the image in a first direction by ninety degrees; inserting one or more rows of expansion bits along the original horizontal axis of the image to convert i rows of bits to j ...


6
Karen L Anderson, Frederick C Mintzer, Gerald Goertzel, Joan L Mitchell: Method for rotating a binary image. International Business Machines Corporation, George E Clark, Thomas P Dowd, December 2, 1986: US04627020 (28 worldwide citation)

A method for rotating an image by 90 degrees includes the steps of: storing the image in a raster format arranged in r rows by c columns, image information in each row being stored in a number of bytes, each byte having b bits, there being c/b bytes in each row of the raster format; moving a block o ...


7
Frederick C Mintzer, Karen L Anderson, Joan L Mitchell: Method for expansion of a digital image. International Business Machines Corporation, George E Clark, Thomas P Dowd, February 4, 1986: US04569081 (28 worldwide citation)

A method for expanding a binary image includes the steps of: storing the image in bit sequence; inserting for each string of 5 bits along a first axis one or more expansion bits, to convert each said string of 5 bits to a string of 6 bits; assigning a value to each expansion bit generated by the abo ...


8
Frederick C Mintzer: Coupled-color error diffusion. International Business Machines Corporation, Thomas P Dowd, May 11, 1993: US05210602 (25 worldwide citation)

A system and method for improving the quality of the output of a full-color image on a reproduction device, such as a display on a monitor or printout from a printer, that only consists of a small number of colors in comparison to the number of colors represented by the input signals. The disclosure ...


9
Karen L Anderson, Frederick C Mintzer: Method for reducing a binary image. International Business Machines Corporation, George E Clark, Thomas P Dowd, April 7, 1987: US04656664 (21 worldwide citation)

The method of the present invention reduces a binary digital image in size by a factor F by a method including the steps of: storing the image in bit sequence; removing one or more rows of bits along the vertical axis of the image to convert i rows of bits to j rows of bits where 0.5i.ltoreq.j


10
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 ...