Video signal processing circuitry

Details Video signal processing circuitry Video signal processing circuitry

1985-11-18

1987-06-30

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358167, 358 36, 358 37, H04N 521

Patent

active

046774866

ABSTRACT:
A video signal processing circuitry having a comb filter to extract a vertical contour component of an input video signal by feeding back a signal, which is obtained by subtracting a nondelay signal from a one-line delay signal relative to the iput video signal, with a feedback coefficient K to an input signal of a one-line delay circuit or to both of such input signal and the nondelay signal anterior to the subtraction. The output signal of the comb filter is added with an addition coefficient A to the input video signal introduced to the comb filter or to the input signal of the one-line delay circuit, whereby an output video signal is produced while any noise component is effectively suppressed without deteriorating the distinction of the vertical contour portion. The addition coefficient A is so set as to have, with respect to the feedback coefficient K, a linear functional relationship of A=1/2+K/2, A=1/2-K/2 or A=K+1/2.

REFERENCES:
patent: 4571613 (1986-02-01), Fukuda
patent: 4575760 (1986-03-01), Nakagaki et al.
"New Systems for Video Processing ICs": Yamashita et al.; IEEE Transactions of Consumer Electronics, vol. CE-29, #3, pp. 179-194.

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