Aperture correction circuit

Details Aperture correction circuit Aperture correction circuit

1989-05-10

1991-02-19

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358166, H04N 5208

Patent

active

049949152

ABSTRACT:
The aperture correction circuit of the present invention comprises a preshoot signal generator which generates the preshoot signal of the edge part of a video signal, an overshoot signal generator which generates the overshoot signal of the edge part of the video signal, a shoot signal composition circuit which adds the preshoot signal and the overshoot signal at an addition ratio corresponding to a control signal, thereby to deliver the resulting signal as a correcting shoot signal, and an adder which adds the video signal and the correcting shoot signal, thereby to deliver the resulting signal as an output, wherein the shoot signal composition circuit is supplied as the control signal with a signal which changes according to the input video signal, such as the differentiated signal of the input video signal. Thus, the ratio between the preshoot signal and the overshoot signal is dynamically changed according to the input signal, so that an image quality can be adjusted according to the input video signal.

REFERENCES:
patent: 4041531 (1977-08-01), Bingham
McMann, Jr. et al. "Improved Signal Processing Techniques", SMPTE Journal, vol. 77 3/1968, pp. 221-228.

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