Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1979-08-20
1980-12-16
Griffin, Robert L.
Facsimile and static presentation processing
Static presentation processing
Attribute control
H04N 9535
Patent
active
042401054
ABSTRACT:
An improved method and system for separating chrominance and luminance information in a quadrature modulated color television signal and similar periodic signals is disclosed. A comb filter selectively separates chrominance and luminance components from the video signal and provides a combed chrominance output and an adaptively combed luminance output. A low frequency luminance vertical transition detector is connected to an input and detects vertical amplitude transitions occurring at adjacent horizontal scanning lines and produces a first switching signal independent of the direction of a particular transition. A second transition detector detects the simultaneous occurrence of transitions in chrominance and high frequency luminance in either direction above predetermined minimum threshold values to provide a second switching signal. A subcarrier frequency-band reject filter in the luminance path, connected to be responsive to one or both of the first and second switching signals, selects subcarrier frequency band rejected luminance in lieu of combed luminance during an internal corresponding to one or both of the switching signals. The system may further or alternatively include a switch connected to switch to chrominance bandpass filtered video in lieu of combed chrominance during the interval of one or both of the first or second switching signals.
REFERENCES:
patent: 3542945 (1970-11-01), Parker
patent: 3674920 (1972-07-01), Faroudja
patent: 4050084 (1977-09-01), Rossi
patent: 4072984 (1978-02-01), Kaiser
patent: 4179705 (1979-12-01), Faroudja
"Comb Filter Improvement with Spurious Chroma Deletion", Kaiser, SMPTE Journal, vol. 86, No. 1, pp. 1-5, Jan. 1977.
Faroudja Yves C.
Griffin Robert L.
Masinick Michael Allen
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