Image analysis – Image compression or coding – Including details of decompression
Patent
1999-10-12
2000-09-12
Au, Amelia
Image analysis
Image compression or coding
Including details of decompression
341 55, 382244, 7098247, G06K 936, G06K 946
Patent
active
061188999
ABSTRACT:
A lossless bandwidth compression method for use in a distributed processor system for communicating graphical text data from a remote application server to a user workstation over a low bandwidth transport mechanism enables the workstation display to support the illusion that the application program is running locally rather than at the remote application server. At the application server, the graphical text data is represented by a string of glyphs, each glyph being a bit mask representing the foreground/background state of the graphical text data pixels. Each unique glyph is encoded by assigning a unique identification code (IDC). Each IDC is compared with the previous IDCs in the string and, if a match is found, the IDC is transmitted to the workstation. If a match with a prior IDC is not found, the IDC and the corresponding glyph pattern are transmitted to the workstation. At the workstation, the IDCs are queued in the order received while the glyph patterns are cached using the corresponding IDCs as addresses. The string of glyphs is reconstructed by using the queued IDCs in their natural order for accessing the cached glyph patterns as required to reproduce the original string of glyphs.
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Bloomfield Marc Alan
Krantz Jeffrey Isaac
Au Amelia
Citrix Systems, Inc.
Johnson Timothy M.
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