Data compression apparatus for video signal and method of data compression for video signal
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United States of America Patent
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Feb 1, 1994
Grant Date -
N/A
app pub date -
Oct 7, 1991
filing date -
Oct 8, 1990
priority date (Note) -
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Abstract
A data compression apparatus for video data having: a dividing circuit for dividing the video data into unit blocks, a converter for orthogonally converting the video data at each of unit blocks, a quantizer for quantizing the orthogonally converted video data, and a coder for run-length-coding the quantized video data, comprises: a first detector for detecting powers of the video data in the horizontal and vertical directions within given bandpasses respectively; a second detector for detecting a difference between the powers; and a controller for controlling the amount of coded data produced by the run-length-coding in accordance with a total of the powers and the difference. This apparatus controls the amount of coded data in accordance with power of input video data and difference between powers of video data of the horizontal and vertical directions. A method for compressing input video data is also disclosed.
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