Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1978-03-13
1979-12-18
Griffin, Robert L.
Facsimile and static presentation processing
Static presentation processing
Attribute control
H04N 9535
Patent
active
041797051
ABSTRACT:
Chrominance and luminance components of a quadrature modulated color television signal are separated by a comb filtering system which includes a chroma separation circuit connected to an input and an adaptive luminance separation circuit also connected directly to the input. The chroma separation circuit includes a one line delay line and a high pass filter connected in parallel therewith. The delay line and the high pass filter are connected to a first subtractor which combines the inputs to provide a comb filtered chroma output. The adaptive luminance separation circuit includes a threshold circuit connected to an output of the chroma separation circuit. The threshold circuit puts out only those portions of separated chroma which exceed a predetermined threshold amplitude. A limiting amplifier connected to the threshold circuit puts out amplitude limited signals of the same phase and polarity as the portions put out by the threshold circuit only when they exceed the predetermined threshold level. An adder circuit is connected to combine the outputs of the threshold circuit of the limiting amplifier. A second subtractor is connected to the output of the adder circuit and is connected to the system input through a delay matching network having a delay equal to the delay of the signal at the output of the adder circuit. The second subtractor subtracts the output of the adder circuit from the output of the delay matching circuit, the difference therefrom being adaptively separated and filtered luminance. Optional circuit elements provide further improvements in chrominance filtering and adaptive luminance filtering.
REFERENCES:
patent: 4050084 (1977-09-01), Rossi
patent: 4072984 (1978-02-01), Kaiser
Griffin Robert L.
Harrison David B.
Psitos Aristotelis M.
LandOfFree
Method and apparatus for separation of chrominance and luminance does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for separation of chrominance and luminance, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for separation of chrominance and luminance will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-455823