Automatic white-balance controlling apparatus
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorHiroaki Sugiura
Life of this patent
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Abstract
An automatic white-balance controlling is for controlling the white-balance of an imaged screen, by controlling the color signal level in accordance with an up-down counting result in a microcomputer. A limited area is established within a VB-VR plane, and a level adjusting operation of the color signals corresponding to the area is limited so as to render a stable white-balance adjusted operation. Judged from data in a time series, the accuracy of the white-balance controlling operation can be assured executing somewhat redundant processing.
Claims9
An automatic white-balance controlling apparatus, comprising:
- (a) processing means for processing color input image signals to produce processed color difference signals;
- (b) integrating means for integrating two types of the processed color difference signals respectively, and outputting an integrated value for each color difference signal;
- (c) comparing means for comparing each of the integrated values obtained from the integrating means to a reference value representing an achromatic color to produce a compared result for each color difference signal;
- (d) means for repeatedly executing an up-down count for each of said color difference signals based on each compared result, respectively, for establishing a limited area in a two-dimensional space defined to represent two types of up-down count results in two dimensional spacial coordinates, for canceling the newest repeatedly executed counting operation with respect to at least one type of the up-down counting result, and for controlling gain levels of the color input image signals prior to processing, based on the up-down counting result;
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- (e) adjusting means for adjusting the gain levels of the color input image signals in accordance with the gain control from the control means so that a stable white balance controlled color video signal can be produced.
An automatic white-balance controlling apparatus comprising:
- (a) means for processing color input image signals to produce processed color difference signals;
- (b) integrating means for integrating two types of the processed color difference signals, and outputting an integrated value for each color difference signal;
- (c) comparing means for comparing each of the integrated values obtained from the integrating means to a reference value representing an achromatic color to produce a compared result for each color difference signal;
- (d) control means for repeatedly executing an up-down count for each of said color difference signals based on each compared result respectively, for storing compared result data from compared results for several events in a time series, for judging when the stored data are completely accorded with each of the color difference signals, and executing up-down counting only when judged to be in accordance, and for controlling gain levels of the color image signals based on the up-down counting result;
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- (e) adjusting means for adjusting the gain levels of the color input image signals in accordance with the gain control from the control means so that a stable white balance controlled color video signal can be produced.
Dependencies are inferred from the claim text.