Judgement circuit and adaptive filter incorporating the same

Details Judgement circuit and adaptive filter incorporating the same Judgement circuit and adaptive filter incorporating the same

1986-12-02

1988-12-06

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 37, H04N 978

Patent

active

047898909

ABSTRACT:
In a judgement circuit for an adaptive filter for use in a color television system, sample values of a composite video signal are obtained by sampling the composite video signal at a predetermined sampling frequency in synchronism with a horizontal scanning frequency in such a manner that the corresponding sample points are arranged in a grating on the screen. A horizontal filter receives the sample values corresponding to a first sample point and a second and a third sample points positioned at the left of and at the right of the first sample point. A vertical filter receives the sample values corresponding to the first sample point and a fourth and a fifth sample points positioned over and under the first sample point. The variation of the signal in the vertical direction and the variation of the signal in the vertical direction are detected, and are compared. One of the output of the horizontal filter and the output of the vertical filter is selected in accordance with the result of the comparison.

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Takashi Okada et al., "New Filter Technology in Picture Processing", Sony Corp., New Filter Technology in Picture Processng, pp. 157-167 (6/82).
J. P. Rossi, "Sub-Nyquist-Encoded PCM NTSC Color Television", SMPTE Journal, vol. 85, No. 1, pp. 1-6 (1976).
Nakagawa et al., Shinichi, "Adaptive YC Separation Digital Filter", 1984 National Convention Record of Institute of Electronics and Communication Engineers of Japan.
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Rossi, "Digital TV Comb Filter with Adaptive Feature", IEEE Conf. Proc. pp. 267-282 (1976).
Rossi, J. SMPTE, 84:545-551 (1975), "Digital Television Image Enhancement".

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