Automatic image quality adjustment device adjusting phase of sam

Details Automatic image quality adjustment device adjusting phase of sam Automatic image quality adjustment device adjusting phase of sam

1999-02-05

2000-08-01

Hsia, Sherrie

Television

Image signal processing circuitry specific to television

Noise or undesired signal reduction

348625, 348572, 348537, H04N 521

Patent

active

060974443

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.

REFERENCES:
patent: 5978041 (1999-11-01), Masuda
patent: 5990968 (1999-11-01), Naka

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