Television – Image signal processing circuitry specific to television – Hue control
Patent
1995-03-31
1996-11-12
Metjahic, Safet
Television
Image signal processing circuitry specific to television
Hue control
348630, 348641, 348653, 348645, H04N 964
Patent
active
055745130
ABSTRACT:
A video signal processor controls aperture correction of the video signal by detecting the occurrence of particular colors in the image produced by the video signal. The particular color, for example, fleshtone, is detected as a ratio of the amplitude of an in-phase color signal and the magnitude of its corresponding quadrature phase color signal. This defines a range of color phases which are classified as the particular color, regardless of their saturation. The detected color is converted into a control signal which changes the amplitude of the aperture correction signal. In one embodiment the control signal has a value of zero if the detected color is within the range of color phases and a value of one otherwise. This control signal is used as a multiplier for the aperture correction signal. In another embodiment, a second range of colors is defined around the defined range. If the detected color is within this second range, the aperture correction signal is reduced in proportion to the difference between the detected color and the particular color.
REFERENCES:
patent: 4876599 (1989-10-01), Kihara
patent: 5291288 (1994-03-01), Masuda
patent: 5294974 (1994-03-01), Naimpally et al.
patent: 5384601 (1995-01-01), Yamashita et al.
Transcripts from "Morning Edition" (Monday, Dec. 5, 1994), Segment #3, High-Tech TV Cameras Akin to Fountain of Youth, pp. 5-8.
Hsia Sherrie
Metjahic Safet
Panasonic Technologies Inc.
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