Method of and apparatus for processing an image with gradation correction of video signal
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United States of America Patent
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-
Feb 6, 1990
Grant Date -
N/A
app pub date -
Aug 26, 1987
filing date -
Sep 2, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The gradation correction of input video signals is conducted in the gradation correctors based on lookup table data. The cumulative histograms of the input video signals are generated in cumulative histogram generators to set highlight points and shadow points. Based on the highlight and shadow points, the standard lookup table data stored in the standard lookup table storage is converted in lookup table data associated with the input video signals and outputted to gradation correctors. According to this method, an appropriate gradation correction can be achieved depending on the input video signals. The standard lookup table storage need only be loaded with the standard lookup table data, namely, a great volume of lookup table data need not be stored.
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