Correction circuit for improving the sharpness of contour of vid

Details Correction circuit for improving the sharpness of contour of vid Correction circuit for improving the sharpness of contour of vid

1980-02-26

1981-07-28

Britton, Howard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 37, H04N 514

Patent

active

042813476

ABSTRACT:
A correction circuit for improving the contour sharpness or quality of video images in devices wherein the video signals are converted into digital form. An even number of series connected multi-stage shift registers is provided, whose inputs are each connected by means of a related multiplier with inputs of an adder. The outputs of the last shift register are connected by means of a further multiplier with further inputs of the adder. Moreover, the multiplication factors of the multipliers form a symmetrical series having an absolute maximum at the center of the series, and the absolute value of the multiplication factor of the intermediate multiplier is greater than the absolute value of all other multiplication factors. The sign of the intermediate multiplier or multiplication factor is opposite to the sign of the algebraic sum of all other multiplication factors.

REFERENCES:
patent: 3030440 (1962-04-01), Schade, Sr.
patent: 3919473 (1975-11-01), Cotter
patent: 3988602 (1976-10-01), Gorsiga, Jr.
patent: 4127873 (1978-11-01), Katagi
patent: 4212072 (1980-07-01), Huelsman
Improved Digital Aperture Corrector, by Deeley et al., Proceedings of the Institution of Electrical Engineers, vol. 121, No. 0, 9/74, pp. 929-934.
Digital and Anolog Enhancement Techniques, by Yves Faroudja, SMPTE Journal, vol. 87, No. 1, 1/78, pp. 24-28.
Enhanced Scintigraphic Information Display Using Computer-Generated Ratio Techniques, by Bell, Journal of Nuclear Medicine, vol. 11, No. 11, 11/70, pp. 655-659.

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