Distortion correction circuit

Details Distortion correction circuit Distortion correction circuit

1997-07-23

1999-12-14

Peng, John K.

Television

Video display

Cathode-ray tube

348807, 348746, 31536818, H04N 322, H04N 326

Patent

active

060024542

ABSTRACT:
After analog-to-digital conversion, a luminance signal 103 and a chrominance signal 109 are stored in a line memory circuit 128. Such stored signals are read out of said line memory circuit, using a read clock 124 obtained by parabolically modulating a read frequency with both the horizontal period and the vertical period. The read-out digital signal is again converted into an analog luminance signal 132 and analog color difference signals 135, 136 by digital-to-analog conversion. By this procedure, inner pincushion distortion or inner barrel distortion is corrected. Since such distortion is corrected by modulating an image signal itself by digital processing, no circuit drift due to the conventional analog correction occurs and no analog circuit design such as troublesome setting of parts constants is required.

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patent: 5784120 (1998-07-01), Cummins et al.
patent: 5793447 (1998-08-01), Fujiwara et al.

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