Automatic image quality adjustment device adjusting phase of sampling clock for analog video signal to digital video signal conversion
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United States of America Patent
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Aug 1, 2000
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N/A
app pub date -
Feb 5, 1999
filing date -
Sep 11, 1998
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Abstract
An MPU changes the phase of a sampling clock signal by one step for each frame until the change in the phase reaches 360 degrees. An image quality detector portion sequentially receives a digital image signal to detect a maximum one of data about the absolute value of a difference between adjacent pixels in one frame as an image quality judgement data signal. The MPU detects a maximum one of all image quality judgement data to determine a phase at that time as an optimum phase of the sampling clock signal. The MPU then periodically checks image quality on a screen, and makes a real-time correction to the phase of the sampling clock signal if a temperature drift or the like occurs.
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