Adjusting a white balance in a camera using a flash
First Claim
1. A white balance adjusting device provided in a still-video camera having an electronic flash, said white balance adjusting device comprising:
- means for determining an exposure condition of said still-video camera when said electronic flash is to be used;
a first memory for storing first image data obtained by a first photographing operation for said exposure condition, said first photographing operation being performed without using said electronic flash, said first image data including pixel luminance data;
a second memory for storing second image data obtained by a second photographing operation for said exposure condition, said second photographing operation being performed by using said electronic flash, said second image data including pixel luminance data; and
means for performing a white balance adjustment for said second image data read from said second memory, in accordance with a difference between luminance data of corresponding pixels, obtained from said first and second image data stored in said first and second memories.
3 Assignments
0 Petitions
Accused Products
Abstract
An exposure condition when an electronic flash is to be used, i.e., an aperture value and a shutter speed, is determined based on a photometry value. Under the exposure condition, a photographing operation is carried out without use of the electronic flash, and image data obtained by this photographing operation are stored in a first image memory. Further, another photographing operation is carried out with use of the electronic flash, and image data obtained by this photographing operation are stored in a second image memory. The image data stored in the first and second image memories are read out and the luminance signals of corresponding pixels are compared. When the difference between the luminance signals is large, the white balance adjustment is performed based on electronic flash light. When the difference between the luminance signals is small, the white balance adjustment is performed based on the ambient daylight.
127 Citations
10 Claims
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1. A white balance adjusting device provided in a still-video camera having an electronic flash, said white balance adjusting device comprising:
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means for determining an exposure condition of said still-video camera when said electronic flash is to be used; a first memory for storing first image data obtained by a first photographing operation for said exposure condition, said first photographing operation being performed without using said electronic flash, said first image data including pixel luminance data; a second memory for storing second image data obtained by a second photographing operation for said exposure condition, said second photographing operation being performed by using said electronic flash, said second image data including pixel luminance data; and means for performing a white balance adjustment for said second image data read from said second memory, in accordance with a difference between luminance data of corresponding pixels, obtained from said first and second image data stored in said first and second memories. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A white balance adjusting device provided in a still-video camera having an electronic flash, said white balance adjusting device comprising:
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means for determining an exposure condition of said still-video camera in a state in which said electronic flash is to be used; means for obtaining image data to be stored in a memory, said image data comprising first image data, for said exposure condition by using said electronic flash, and second image data, for said exposure condition without using said electronic flash; and means for performing a white balance adjustment to said second image data, in accordance with a difference between obtained luminances of corresponding pixels, said luminances being obtained from said first and second image data.
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10. A white balance adjusting device for a camera having an electronic flash, comprising:
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first means for storing pixel luminance data obtained by a photographing operation performed without a use of the electronic flash; second means for storing pixel luminance data obtained by a photographing operation performed with the use of the electronic flash; and means for adjusting a white balance in accordance with a difference between pixel luminance data of corresponding pixels stored in said first and second storing means.
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Specification