Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1989-01-12
1990-08-21
Chin, Tommy P.
Facsimile and static presentation processing
Static presentation processing
Attribute control
H04N 964
Patent
active
049511270
ABSTRACT:
A digital color-signal-processing circuit generates a phase-angle signal and a magnitude signal as outputs in response to an R-Y color-difference signal and a B-Y color-difference signal. The circuit includes a resolver which convertes cartesian coordinate representations of the color-difference signals into polar coordinate representations of the phase-angle signal and the magnitude signal. The phase-angle signal carries the hue information, which is processed in a hue stage. The magnitude signal carries the saturation information, which is processed in a saturation stage. The processed phase-angle signal and the processed magnitude signal are reconverted to cartesian coordinate representations of the R-Y and B-Y color-difference signals in a reconverting resolver.
REFERENCES:
patent: 4084178 (1978-04-01), Srivastava
patent: 4352123 (1982-09-01), Flamm
patent: 4523221 (1985-06-01), Chin
patent: 4544944 (1985-10-01), Chin
patent: 4710892 (1987-12-01), Fling
patent: 4809059 (1989-02-01), Flamm
Jack E. Volder, "The CORDIC Trigonometric Computing Technique", IRE TRANSACTIONS ON ELECTRONIC COMPUTERS, Sep. 1959, pp. 330-334.
Flamm Peter M.
Mehrgardt Soenke
Chin Tommy P.
Deutsche ITT Industries GmbH
Peterson Thomas L.
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