Picture-quality correction circuit

Details Picture-quality correction circuit Picture-quality correction circuit

1986-09-18

1989-03-07

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358162, H04N 514

Patent

active

048111007

ABSTRACT:
A contour correction circuit applies a preshoot and overshoot to the rising and falling edges of an original signal waveform and supplies a contour-corrected signal with an emphasized contour, as a first signal, to maximum level circuits. The original signal which is time-advanced ahead of the first signal is supplied as a second signal to the maximum level circuit. The original signal, time-delayed by a delay element behind the first signal, is supplied as a third signal to the maximum level signal. The first and third signals are supplied to a maximum level circuit. The output of the maximum level circuits is supplied to a minimum level circuit. The minimum level circuit produces an output signal with the preshoot and overshoot of the first signal eliminated and with the rising and falling edges sharply defined with respect to the original signal.

REFERENCES:
patent: 4541014 (1985-09-01), Yagi
patent: 4647960 (1987-03-01), Miura
patent: 4654709 (1987-03-01), Umezawa
patent: 4654711 (1987-03-01), Mikado
patent: 4658295 (1987-04-01), Umezawa
patent: 4665432 (1987-03-01), Shima

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