Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1989-01-26
1989-08-22
Shepperd, John W.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 27, 358 37, H04N 974
Patent
active
048600911
ABSTRACT:
A composite video signal is supplied to chrominance and luminance signal separators. A chrominance signal is compared by a phase comparator with an average phase signal, and a difference between them is supplied to a control terminal of a phase modulator. The chrominance signal is input to the phase modulator. The phase averaging circuit, phase comparator, and phase modulator together constitute a hue emphasizing circuit. An output from the hue emphasizing circuit (output from phase modulator) is supplied to a mixer via a gain control amplifier (GCA). The chrominance signal is input to a level detector, where it is envelope-detected. An output from the level detector is supplied to a gain control terminal of the GCA. An output from the GCA emphasizing circuit (output from GCA) is a hue- and saturation-emphasized chrominance signal, and is supplied to the first input terminal of the mixer. A luminance signal is put to a phase shifter via a mixer. A hue-emphasized chrominance signal which is output from the phase comparator is subjected to quadratic differentiation by a differential circuit, and is input as a gain control input to a mixer. The last-mentioned mixer, differential circuit, and phase shifter together constitute an aperture compensator. The shift amount is set in the phase shifter, so as to compensate for a difference between the chrominance and luminance signals generated from the hue emphasizing circuit and the aperture compensator, respectively.
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DIGITAL PROCESSING OF ENDOSCOPIC COLOR IMAGES; Ohyama et al.; in: Optics Communications, Sep. 15, 1985; vol. 55, No. 4, pp. 242-247.
Kimura Kenji
Tsuji Kiyoshi
Olympus Optical Co,. Ltd.
Shepperd John W.
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