Patent US5471806A successfully refreshed from Google Patents.
EP0452770A2
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EP
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Image pickup apparatus
Assignee: Canon Inc
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Filing: 1991-04-08
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Granted: —
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Expires: 2011-04-08
Abstract
Abstract An image pickup apparatus includes a first white balance adjusting circuit for generating a control signal for white balance adjustment by using a signal output from an image pickup element, a second white balance adjusting circuit for generating a control signal for white balance adjustment by using a signal output from a color measure sensor except for the image pickup element, and a synthesizing circuit for setting and outputting a variable synthesis ratio of the control signals from the two white balance adjusting circuits in accordance with information from an optical system.
Inventors
- 👤 Masao C/O Canon Kabushiki Kaisha Suzuki
- 👤 Yasuyuki C/O Canon Kabushiki Kaisha Yamazaki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 10:36
CPC Classifications
H; H04; H04N; H04N23/00; H04N23/80; H04N23/84; H04N23/88
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
91 words
An image pickup apparatus, comprising first white balance adjusting means for generating a control signal for white balance adjustment by using a signal output from an image pickup element, second white balance adjusting means for generating a control signal for white balance adjustment by using a signal output from a color measure sensor except for said image pickup element, and synthesizing means for setting and outputting a variable synthesis ratio of the control signals from said first and second white balance adjusting means in accordance with information from an optical system.
Claim 2
Dependent Claim
31 words
An apparatus according to claim 1, wherein the information from said optical system is information from distance measure means for measuring a distance between said image pickup apparatus and an object.
Claim 3
Dependent Claim
25 words
An apparatus according to claim 1, wherein the information from said optical system is information of a focal distance from said image pickup optical system.
Claim 4
Dependent Claim
43 words
An apparatus according to claim 1, wherein the information from said optical system is information from distance measure means for measuring a distance between said image pickup apparatus and an object, and information of a focal distance from said image pickup optical system.
Claim 5
Dependent Claim
106 words
An image pickup apparatus, comprising first white balance adjusting means for generating a control signal for white balance adjustment by using a signal output from an image pickup element, second white balance adjusting means for generating a control signal for white balance adjustment by using a signal output from a color measure sensor except for said image pickup element, and synthesizing means for comparing a color measure information ratio from said image pickup element with a color measure information ratio from said color measure sensor and setting and outputting a variable synthesis ratio of the control signals from said first and second white balance adjusting means.
Claim 6
Dependent Claim
17 words
An apparatus according to claim 5, further comprising a warning device for generating a photographic warning signal.
Claim 7
Dependent Claim
39 words
An apparatus according to claim 5, further comprising memory means for storing the white balance control voltages from said first and second white balance adjusting means, thereby performing white balance adjustment by using the stored white balance control voltages.
Claim 8
Dependent Claim
94 words
An image pickup apparatus comprising first white balance adjusting means for generating a control signal for white balance adjustment by using a signal output from an image pickup element, second white balance adjusting means for generating a control signal for white balance adjustment by using a signal output from a color measure sensor, and synthesizing means for variably setting a synthesis ratio of the control signals in accordance with a difference between the signal output from said image pickup element or a signal equivalent thereto and the signal output from said color measure sensor.
Claim 9
Dependent Claim
101 words
An image pickup apparatus comprising first white balance adjusting means for generating a control signal for white balance adjustment by using a signal output from an image pickup element, second white balance adjusting means for generating a control signal for white balance adjustment by using a signal output from a color measure sensor having a frame angle different from an image pickup angle of an image pickup optical system, and synthesizing means for comparing an output from photometric means different from said color measure sensor with the output from said color measure sensor and for variably outputting the two control signals.
Claim 10
Dependent Claim
28 words
An apparatus according to claim 9, wherein said photometric means has a photometric image angle almost equal to an image pickup angle of said image pickup optical system.
Claim 11
Dependent Claim
27 words
An apparatus according to claim 9, wherein said photometric means has a photometric image angle smaller than an image pickup angle of said image pickup optical system.
Claim 12
Dependent Claim
15 words
An apparatus according to claim 9, wherein said photometric means uses an image pickup element.
Claim 13
Dependent Claim
54 words
An image pickup apparatus for performing white balance adjustment using image pickup outputs from an image pickup element, comprising control means for comparing the image pickup outputs at predetermined positions on a frame upon sampling of the outputs form said image pickup elements, and performing white balance adjustment in accordance with a comparison result.
Claim 14
Dependent Claim
113 words
An image pickup apparatus comprising first white balance adjusting means for generating a white balance control signal for white balance adjustment by using a signal output from an image pickup element, second white balance adjusting means for generating a white balance control signal for white balance adjustment by using a signal output from a color measure sensor except for said image pickup element, and synthesizing means for comparing signals of predetermined positions on a frame upon sampling of signals output from at least said image pickup element and mixing the white balance control signals from said first and second white balance adjusting means at a predetermined ratio in accordance with a comparison result.
Claim 15
Dependent Claim
17 words
An apparatus according to claim 14, further comprising a warning device for generating a photographic warning signal.
Claim 16
Dependent Claim
39 words
An apparatus according to claim 14, further comprising memory means for storing the white balance control voltages from said first and second white balance adjusting means, thereby performing white balance adjustment by using the stored white balance control voltages.
Claim 17
Dependent Claim
104 words
An image pickup apparatus comprising: (a) image pickup means for photoelectrically converting image pickup light from an object into a video signal; (b) first means for generating a first white balance signal on the basis of the image pickup light; (c) second means for generating a second white balance control signal on the basis of image pickup light obtained in a state different from the image pickup light used in said first means; and (d) control signal generating means for synthesizing the first and second white balance control signals in accordance with an image pickup condition and generating a third white balance control signal.
Claim 18
Dependent Claim
28 words
An apparatus according to claim 17, wherein said first means generates the first white balance control signal on the basis of an output from said image pickup means.
Claim 19
Dependent Claim
28 words
An apparatus according to claim 17, wherein said second means generates the second white balance control signal on the basis of an output from an external photometric sensor.
Claim 20
Dependent Claim
32 words
An apparatus according to claim 17, wherein said second means generates a white balance control signal on the basis of an image pickup light range wider than the of said first means.
Claim 21
Dependent Claim
20 words
An apparatus according to claim 17, wherein the image pickup condition includes a color deviation of the image pickup light.
References Cited (Backward Citations)
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