Contour correction signal generating circuit

Details Contour correction signal generating circuit Contour correction signal generating circuit

1995-01-18

1996-10-01

Metjahic, Safet

Television

Image signal processing circuitry specific to television

Transition or edge sharpeners

348630, 348666, H04N 5208, H04N 521

Patent

active

055614736

ABSTRACT:
A vertical contour correcting circuit that provides contour correction of a luminance signal at a horizontal color transition area of an image, thereby minimizing dot interference at the color transition area of a reproduced image. The vertical contour correcting circuit includes a vertical band-pass filter which outputs a level difference signal. The level difference signal is delayed to produce a first delay signal. The first delay signal is delayed to produce a second delay signal. An intermediate value signal is determined from the level difference signal, the first delay signal, and the second delay signal. The intermediate value signal and the first delay signal are added together so that their carrier color signal band components are canceled out.

REFERENCES:
patent: 4041531 (1977-08-01), Bingham
patent: 4489346 (1984-12-01), Tawaka et al.
patent: 4661842 (1987-04-01), Ishige et al.
patent: 4677461 (1987-06-01), Mizutani et al.
patent: 5144399 (1992-09-01), Nakayama et al.

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