Horizontal contour emphasizing signal processor

Details Horizontal contour emphasizing signal processor Horizontal contour emphasizing signal processor

1995-04-06

1996-08-06

Metjahic, Safet

Television

Image signal processing circuitry specific to television

Transition or edge sharpeners

348629, 348630, H04N 5208, H04N 968

Patent

active

055438598

ABSTRACT:
An improved horizontal contour emphasizing signal processor is provided with a detector to detect a period during which luminance signal changes are produced, a generator to generate a rectangular-wave signal during this period, and a multiplier for multiplying a first horizontal contour emphasizing signal derived from the luminance signal to the rectangular-wave signal to generate a second horizontal contour emphasizing signal, and in this case, a preshoot is added to the input luminance signal waveform at the starting part of a radical waveform change and an overshoot is added at the ending part of the waveform change in order to perform finer horizontal contour emphasizing.

REFERENCES:
patent: 4994915 (1991-02-01), Takahashi

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