Method and system for automatically adjusting color balance of a TV camera
AssigneeHitachi Denshi Kabushiki Kaisha
InventorKazuhiro Tanabe
Life of this patent
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Abstract
In an automatic color-balance setup system for a color TV camera, a chart board having a white pattern, a black pattern and a gray pattern is imaged by the color TV camera for the purpose of color balance adjustment. The image signal data appearing at the output of the TV camera are analyzed to compute and determine the white level, the black level and the gray level, and the locations of the image signal data corresponding to the individual levels, measurement regions for the white level, the black level and the gray level are automatically determined color balance automatic setup.
Claims10
A method of automatically adjusting color balance of a TV camera, comprising the steps of:
- picking up by a TV camera, an image of a chart board having an image region of a white level, an image region of a black level and an image region of a gray level to generate an image signal;
- dividing the image signal into a plurality of blocks;
- selecting adequate blocks corresponding to a white level, a black level and a gray level based on signal levels of the individual blocks;
- and
- determining the white level, the black level and the gray level based on the signal levels of the selected adequate blocks and measurement regions for the white level, the black level and the gray level, respectively, and automatically adjusting the color balance, each of said measurement regions including at least one adequate block.
A system for automatically adjusting color balance of a TV camera, comprising:
- TV camera means for imaging a chart board having an image region of a white level, an image region of a black level and an image region of a gray level to generate an image signal;
- measurement region determining means for dividing the image signal into a plurality of blocks, for selecting adequate blocks corresponding to the white level, the black level and the gray level based on signal levels of the individual blocks and for determining measurement regions for the white level, the black level and the gray level based on the selected adequate blocks for the white level, the black level and the gray level, each of said measurement regions including at least one adequate block;
- and
- adjusting means for adjusting color balance based on the white level, the black level and the gray level of the determined measurement regions.
Dependencies are inferred from the claim text.