Magnitude independent hanging dot detector

Details Magnitude independent hanging dot detector Magnitude independent hanging dot detector

1985-10-24

1987-07-21

Chin, Tommy P.

Facsimile and static presentation processing

Static presentation processing

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358 39, H04N 964

Patent

active

046822135

ABSTRACT:
A hanging dot detector for a video signal processor including a comb filter is disclosed. The respective phases of the signals in the band of frequencies normally containing color representative information of both the comb filtered chrominance and luminance signals are detected. The magnitude of the changes of the respective comb filtered luminance and chrominance phase angle signals over a given time period are compared. A control signal is generated in response to the comparison of the changes over the period of time of the respective phases. A signal coupling unit couples the comb filtered luminance signal to the luminance processing channel. In response to the control signal, the signal coupling means alters the frequency composition of the comb filtered luminance signal so as to eliminate the color representative information. A further embodiment is disclosed to process a complementary-color vertical transition condition.

REFERENCES:
patent: 4149181 (1979-04-01), Burdick et al.
patent: 4179705 (1979-12-01), Faroudja
patent: 4241363 (1980-12-01), Maeyama et al.
patent: 4415918 (1983-11-01), Lewis, Jr.
patent: 4523221 (1985-06-01), Chin et al.
patent: 4544944 (1985-10-01), Chin
Research Disclosure, by William K. Hickok, #17356, pp. 56-57, Sep. 78.
"Vectors", by Barnett and Fujii, John Wiley & Sons, Inc., New York, 1963, pp. 5 and 33.

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