06175650 is referenced by 144 patents and cites 29 patents.

Pixel blocks of an input image are type classified based on an analysis of the secord differences between the values of neighboring pixels in the rows and columns of each pixel block. A histogram of these second order differences may be employed to refine this analysis

Title
Adaptive quantization compatible with the JPEG baseline sequential mode
Application Number
9/13480
Publication Number
6175650 (B1)
Application Date
January 26, 1998
Publication Date
January 16, 2001
Inventor
Doron Kletter
San Mateo
CA, US
Asghar Nafarieh
Menlo Park
CA, US
Donald J Curry
Menlo Park
CA, US
Jean Marc Frailong
Portola Valley
CA, US
Pradeep S Sindhu
Mountain View
CA, US
Assignee
Xerox Corporation
CT, US
IPC
G06K 9/00
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