Pulse or digital communications – Bandwidth reduction or expansion – Television or motion video signal
Reexamination Certificate
2008-07-22
2008-07-22
Jaroenchonwanit, Bunjob (Department: 2152)
Pulse or digital communications
Bandwidth reduction or expansion
Television or motion video signal
C375S240260, C709S204000, C709S205000, C709S206000
Reexamination Certificate
active
07403566
ABSTRACT:
A computer system transmits images of its display screen over a low bandwidth line. The computer system operates under a display control system, where screen paint or equivalent messages are used to write messages to portions of a display screen of the computer system. In a particular embodiment, the display control system is a windowing system such as is known in the art. The screen is divided into multiple macroblocks. The screen paint messages are intercepted and decoded to determine altered macroblocks on the display. A changed-blocks table is constructed and marked according to altered macroblocks. An additional thread reads the changed-blocks table and encodes macroblocks as predicted blocks or initial blocks, depending upon the amount of change, and transmits them to a decode and display system. Periodically each macroblock in the screen top is marked as changed and requiring an initial block transmission in the changed-blocks table.
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wxPython, CHANGES.txt, Sep. 17, 2000.
Paul Croft, Subclassing Made Easy, Dec. 20, 2002, Microtek Solutions.
Bowers Richard D.
Hutler Kevin
Hewlett--Packard Development Company, L.P.
Jaroenchonwanit Bunjob
Whipple Brian P
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