Computer graphics processing and selective visual display system – Computer graphics processing – Three-dimension
Patent
1995-10-27
1999-11-23
Jankus, Almis R.
Computer graphics processing and selective visual display system
Computer graphics processing
Three-dimension
G06T 900
Patent
active
059908998
ABSTRACT:
A Windows.RTM. metafile is compressed by first processing individual records. In some types of records, record type indicators are mapped to values having fewer significant bits than the original record type indicators. In addition, record length indicators are removed in some record types because they are constant values. In record types where the length varies, the record length indicator is divided to reduce its number of significant bits. There are also record types having one or more arguments that rarely change. For records of these types, the arguments are removed. There are other types of records whose arguments are often repeated from previous records of the same type. When this is the case, the arguments are removed. Many metafile arguments specify graphics coordinates in terms of absolute values. These absolute values are converted to relative values. In most cases, this reduces the number of significant bits required by the values. To further reduce the number of leading significant bits, negative values are negated and their original sign bits are stored separately. Once the records have been processed in this manner, individual data fields of the metafile are processed. Each data field has its leading zero bits removed. The remaining bits are packed into a variable number of bytes, often a smaller number than the original number of bytes used. Subsequent pattern matching compression is used to provide further compression gains.
REFERENCES:
patent: 5073926 (1991-12-01), Suzuki et al.
Jankus Almis R.
Microsoft Corporation
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