Hui Chun Cheng

US Patent:

6983068, Jan 3, 2006

Filed:

Sep 28, 2001

Appl. No.:

09/965922

Inventors:

Salil Prabhakar - Redwood City CA, US
Hui Cheng - Bridgewater NJ, US
Zhigang Fan - Webster NY, US
John C. Handley - Fairport NY, US
Ying-wei Lin - Penfield NY, US

Assignee:

Xerox Corporation - Stamford CT

International Classification:

G06K 9/00

US Classification:

382162, 382224

Abstract:

A method and system for image processing, in conjunction with classification of images between natural pictures and synthetic graphics, using SGLD texture (e. g. , variance, bias, skewness, and fitness), color discreteness (e. g. , RL, RU, and RV normalized histograms), or edge features (e. g. , pixels per detected edge, horizontal edges, and vertical edges) is provided. In another embodiment, a picture/graphics classifier using combinations of SGLD texture, color discreteness, and edge features is provided. In still another embodiment, a “soft” image classifier using combinations of two (2) or more SGLD texture, color discreteness, and edge features is provided. The “soft” classifier uses image features to classify areas of an input image in picture, graphics, or fuzzy classes.

US Patent:

7119924, Oct 10, 2006

Filed:

Sep 28, 2001

Appl. No.:

09/966030

Inventors:

Salil Prabhakar - Redwood City CA, US
Raja Bala - Webster NY, US
Hui Cheng - Bridgewater NJ, US
John C. Handley - Fairport NY, US
Ying-wei Lin - Penfield NY, US

Assignee:

Xerox Corporation - Stamford CT

International Classification:

G06F 15/00

US Classification:

358 19, 358522, 358518, 382164, 382167, 382168, 382171, 382173, 382281, 345590, 345591

Abstract:

A process for color graphics image processing, related to detection and segmentation of sweeps, is provided. An input graphics image is transformed into a three-dimensional histogram in an appropriate color space (e. g. , CIELUV). Two-dimensional histograms are estimated from the three-dimensional histogram The two-dimensional histograms are processed to detect and segment sweeps Sweep segment information from the processing of the two-dimensional histograms is combined The combined sweep segment information is used to process the input graphics image to identify and segment sweeps Post-processing may be optionally and selectively used to reject false alarms (i. e. , areas falsely identified as sweeps).