Apparatus for correcting for shading defects in video signals induced by variations in the speed of scanning spots in a TV camera
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United States of America Patent
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Apr 18, 1989
Grant Date -
N/A
app pub date -
Sep 3, 1985
filing date -
Sep 7, 1984
priority date (Note) -
Expired
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Abstract
A device for correcting shading in video signals which has conventionally occurred due to variations in speeds of the scanning spots. Speeds of the scanning spot are detected, and variations in these speeds are also detected. In addition, conventional-type digital correction values for correcting geometry and convergence errors are produced. Variations in speed are detected, and are digital-to-analog converted. A shading output correction signal indicative of a sweep speed variation is produced. This signal is added to the digital correction values to form a corrected correction value.
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