Patent EP0454175A2 successfully refreshed from Google Patents.
EP0454175A2
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EP
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White balance adjusting apparatus automatically adjusting white balance on the basis of color information signal obtained from image-sensing device
Assignee: Sanyo Electric Co Ltd
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Filing: 1991-04-29
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Granted: —
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Expires: 2011-04-29
Abstract
Abstract 64 regions are set on an image sensing picture of a video camera, wherein evaluating values r ij , b ij and y ij are obtained by averaging color difference signals R-Y, B-Y and a luminance signal Y obtained from a video signal, respectively, over one field period for each region. When producing a gain control signal for each color difference signal, fuzzy inference is made on the basis of these evaluating values and a weighting amount for each color evaluating value for each region is determined. As a result of the weighting, the contribution degree of a color difference signal in a region not including a light source color temperature axis on a color plane is reduced to achieve good white balance adjustment.
Inventors
- 👤 Toshinobu Haruki
- 👤 Kenichi Kikuchi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 18:22
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/64; H04N9/73; H04N23/00; H04N23/80; H04N23/84; H04N23/88; Y; Y10; Y10S; Y10S706/00; Y10S706/90
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
112 words
A white balance adjusting apparatus for automatically adjusting white balance on the basis of a video signal obtained from image-sensing means (1, 2), comprising: amplifying means (4, 5) for amplifying a plurality of color information signals in said video signal with respective variable gains; representative value determining means (21 - 28) for determining representative values indicating color information for the entirety of an image-sensed picture on the basis of said color information signals; and gain control means (29, 30) for controlling said variable gains of said amplifying means on the basis of said representative values; wherein the determination of representative values by said representative value determining means is made using fuzzy inference.
Claim 2
Dependent Claim
220 words
A white balance adjusting apparatus for automatically adjusting white balance on the basis of video signal obtained from image-sensing means (1, 2), comprising: amplifying means (4, 5) for amplifying a plurality of color information signals in said video signal with respective variable gains; means (24, 25) for dividing an image-sensed picture so as to set a plurality of regions on said image-sensed picture; means (21, 22, 23, 26) for converting respective levels of said plurality of image information signals for each of said plurality of regions into color evaluating values; representative value determining means (28) for determining representative values indicating color information for the entirety of the image-sensed picture on the basis of said color evaluating values in each of said plurality of regions; weighting means (27) for weighting each color evaluating value in each of said plurality of regions when determining representative values by said representative value determining means; and gain control means (29, 30) for controlling said variable gains of said amplifying means on the basis of said representative values; wherein the determination of a weighting amount by said weighing means is made by making fuzzy inference with a value based on at least each color evaluating value in each of said plurality of regions as an input variable and with the weighting amount as a conclusion portion.
Claim 3
Dependent Claim
48 words
The white balance adjusting apparatus according to claim 2, wherein the fuzzy inference for determining said weighting amount by said weighting means uses at least a sum and a difference of color evaluating values of red and blue in each of said plurality of regions as input variables.
Claim 4
Dependent Claim
39 words
The white balance adjusting apparatus according to claim 2, wherein the fuzzy inference for the weighting amount determination by said weighting means further employs a luminance signal level in each of said plurality of regions as an input variable.
Claim 5
Dependent Claim
117 words
A white balance adjusting apparatus for automatically adjusting white balance on the basis of a video signal obtained from image-sensing means (1, 2), comprising: amplifying means (4, 5) for amplifying a plurality of color information signals in said video signal with respective variable gains; representative value determining means (37, 38) for determining representative values indicating color information for the entirety of an image-sensed picture on the basis of said color information signals; and gain control means (39, 40, 41, 43, 44) for controlling said variable gains of said amplifying means on the basis of said representative values; wherein the control of gains of said color information signals by said gain control means is made using fuzzy inference.
Claim 6
Dependent Claim
57 words
The white balance adjusting apparatus according to claim 5, wherein the fuzzy inference for gain control by said gain control means uses phase difference between a predetermined light source color temperature axis and said color information signals as an input variable and a time constant of gain control by said gain control means as a conclusion portion.
Claim 7
Dependent Claim
55 words
The white balance adjusting apparatus according to claim 5, wherein the fuzzy inference for gain control by said gain control means uses a high frequency component level of a luminance signal in said video signal as an input variable and a time constant of gain control by said gain control means as a conclusion portion.
Claim 8
Dependent Claim
113 words
A white balance adjusting apparatus for automatically adjusting white balance on the basis of a video signal obtained from image-sensing means (1, 2), comprising: amplifying means (4, 5) for amplifying plurality of color information signals in said video signal with respective variable gain; gain control means (37, 38, 43, 44) for controlling said variable gains of said amplifying means on the basis of said color information signals; phase difference detecting means (40) for detecting phase difference between a predetermined light source color temperature axis and said color information signals; and means (41) for determining a time constant of the gain control by said gain control means in response to said detected phase difference.
Claim 9
Dependent Claim
120 words
A white balance adjusting apparatus for automatically adjusting white balance on the basis of a video signal obtained from image-sensing means (1, 2), comprising: amplifying means (4, 5) for amplifying a plurality of color information signals in said video signal with respective variable gains; gain control means (37, 38, 43, 44) for controlling said variable gains of said amplifying means on the basis of said color information signals; contrast evaluating value detecting means (8, 39) for detecting a high frequency component level in the luminance signal in said video signal as a contrast evaluating value; and means (41) for determining a time constant of the gain control by said gain control means in response to said detected contrast evaluating value.
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