Television – Bandwidth reduction system – Data rate reduction
Patent
1992-07-02
1994-09-27
Britton, Howard W.
Television
Bandwidth reduction system
Data rate reduction
348574, H04N 713
Patent
active
053510844
ABSTRACT:
A system and method for increasing the color or luminance gray scale levels from, for example 16 to 32, without increasing the transmission bit rate to produce sharper images with less band width requirement. An error level or pedestal is added to the analog signal of each pixel or every other video unit, such as a line. After decompression, the digital signals of one unit are added to those of the adjacent unit--pixel by corresponding pixel--to yield double the gray scale levels but for a signal twice the proper value. The signal value is then divided by two, yielding a signal of the proper value but at twice the number of possible gray scale levels. In 4-bit video, the result is to convey 5-bit video with the use of two adjacent transmitted 4-bit words and to generate the 5-bit word in the post processor after decompression.
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Britton Howard W.
Dreyfus Edward
Global Telecommunications Industries, Inc.
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