04410916 is referenced by 104 patents and cites 8 patents.

A dual mode facsimile data compression technique which possesses the advantage of symbol recognition and extended run-length coding methods. In operation, a symbol blocking operator isolates digital raster data representing valid alphanumeric characters and document symbols. The first symbol encoungered is placed in a memory or library and as each new symbol is detected, it is compared with each entry of the library. If the comparison is within a predetermined tolerance, a library identification code representing the symbol is generated and transmitted along with the symbol location coordinates. Otherwise, the new symbol is placed in the library and its digital pattern and location is transmitted. A scoring system determines which elements of the library are to be replaced by new prototypes once the library is filled. Non-isolated symbols are coded by a two-dimensional run-length coding method for transmission.

Title
Dual mode facsimile coding system and method
Application Number
69551
Publication Number
4410916
Application Date
July 9, 1981
Publication Date
October 18, 1983
Inventor
Robert H Wallis
Portola Valley
CA, US
Lyle V Rennick
Cupertino
CA, US
Wen Hsiung Chen
Sunnyvale
CA, US
Ronald S Bader
Cupertino
CA, US
William K Pratt
San Jose
CA, US
Agent
Flehr Hohbach Test Albritton & Herbert
Assignee
Compression Labs
CA, US
IPC
H04N 1/40
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