James R Ziobro

US Patent:

20020063719, May 30, 2002

Filed:

Nov 29, 2000

Appl. No.:

09/725384

Inventors:

James Ziobro - Rochester NY, US

International Classification:

G09G005/00

US Classification:

345/582000

Abstract:

A method for preserving color information in a black and white version of a color image includes the analysis of the color image. The analysis comprises a search for conflicting colors. Conflicting colors are colors that are normally transformed to the same gray level in a black and white version of the image. One embodiment, working in a CIELAB color space includes the use of a three dimensional histogram for detecting predominant colors having the same luminance. Such colors are classified as conflicting colors. Modulations are added to the gray scale versions of conflicting colors in order to make them distinguishable. Modulation is only applied to conflicting colors thereby minimizing any deleterious effect and allowing the method to be applied in a “walk up mode” of an image processor. An image processor operative to perform the method includes an image analyzer operative to find and classify conflicting colors in the color image, and a gray scale modulator operative to add modulations to gray scale versions of only the conflicting colors within a gray scale version of the color image.

US Patent:

20060269133, Nov 30, 2006

Filed:

May 31, 2005

Appl. No.:

11/139595

Inventors:

David Metcalfe - Marion NY, US
James Ziobro - Rochester NY, US

Assignee:

Xerox Corporation - Stamford CT

International Classification:

G06K 9/34
G06K 9/00

US Classification:

382176000, 382168000

Abstract:

A method for processing image data may include: generating a window mask that indicates which pixels are part of a window and generating raw window identifiers to be assigned to detected windows. The method may further include regenerating raw window identifiers from the window mask. For example, in an auto windowing image processsing system, a mask value may be stored in a page buffer, rather than a window identifier, so that less memory is required for the page buffer. In embodiments, the mask value may be a single bit while the window identifier is multiple bits.