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US 5,351,084 AGranted
Compressed video bit rate reduction system
AssigneeGlobal Telecommunications Industries, Inc.
InventorBruce A. Blair
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AssigneeGlobal Telecommunications Industries, Inc.
InventorBruce A. Blair
Estimating the term…
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.
A compressed video bit rate reduction system comprising:
Apparatus for reducing the bit rate of compressed digital video systems having a source of video analog signals that include an original number of gray scale levels and first means for digitizing and compressing said digital signals for transmission through a medium, and receiving means including decompression means for decompressing the received digital video signals and second means for converting digital video signals into video display signals, the apparatus comprising preprocessing means adapted to be coupled to said first means for applying an error level to at least some of the analog video signals before they become digitized by said first means, and further comprising post processing means adapted to be coupled to said second means for processing each signal that includes the error information with a signal that does not include the error information.
A method of reducing the bit rate for transmission of compressed digital video signals, comprising
Dependencies are inferred from the claim text.