Title:
【発明の名称】白バランス調整装置
Document Type and Number:
Japanese Patent JP2614542
Kind Code:
B2
Abstract:
PURPOSE:To enable a stable white balance adjustment without operating a detail condition setting corresponding to various conditions by using a fuzzy inference for the decision of the gain of each color signal. CONSTITUTION:The gain of each color signal is controlled based on the central value of the color information signal of an entire screen, based on the color information signal in a picked up video signal. The fuzzy inference is used for the decision of the gain of each color signal by gain control circuits 43 and 44. To put it concretely, a phase difference between a constant color temperature changing axis and the color information signal, and the high-pass component level of a luminance signal in the video signal are defined as an input variable, and the time constant of a gain control is defined as a conclusion part, in order to operate the fuzzy inference. A phase difference theta and a contrast evaluation value (yh) are inputted to a time constant calculating circuit 21, and the changing ration of the gain at R and B amplifier circuits 4 and 5, that is, the time constant of the gain control is decided by the fuzzy inference.
Inventors:
Kenichi Kikuchi
Haruki Toshinori
Haruki Toshinori
Application Number:
JP2472191A
Publication Date:
May 28, 1997
Filing Date:
February 19, 1991
Export Citation:
Assignee:
Sanyo Electric Co., Ltd.
International Classes:
G05B13/02; H04N9/73; (IPC1-7): H04N9/73; G05B13/02
Domestic Patent References:
| JP62141283U |
Attorney, Agent or Firm:
Koji Yasutomi (1 person outside)