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Patent Searching and Data


Title:
CHROMINANCE SIGNAL CONTROLLING CIRCUIT
Document Type and Number:
Japanese Patent JPS5813094
Kind Code:
A
Abstract:

PURPOSE: To obtain a uniform color for the skin of human beings during the inter-program and the inter-channel periods by driving in parallel an automatic chrominance signal controlling circuit and a skin color controlling circuit and, at the same time, by stopping the operation of the skin color controlling circuit during the vertical blanking period.

CONSTITUTION: A composite chrominance signal 5 extracted from a composite video signal by a band-pass filter is inputted into a signal processing circuit 1 and each signal of R-Y, G-Y, and B-Y are outputted. The two signals of R-Y and B-Y are added to a VIR automatic chrominance signal controlling circuit 2 and a skin color controlling circuit 3, and color saturation control signals 7 and 9 and hue control signals 8 and 10 are outputted, and then, the color saturation and the hue of the chrominance signal are controlled in the chrominance signal processing circuit 1. The skin color controlling circuit 3 is configurated in such a way that, when the chrominance signal is controlled in the processing circuit 1, the controlling circuit 3 is stopped its operation only for the vertical blanking period by a signal from a switching circuit 4 which is controlled by a blanking signal 6.


Inventors:
TAKEGAMI SHIGERU
Application Number:
JP11085281A
Publication Date:
January 25, 1983
Filing Date:
July 17, 1981
Export Citation:
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Assignee:
HITACHI LTD
International Classes:
H04N9/45; H04N9/64; H04N9/68; (IPC1-7): H04N9/46; H04N9/535
Attorney, Agent or Firm:
Michito Hiraki