Image brightness correction method
AssigneeAltek Corporation
InventorsChan-Min Chou, Chung-Pin Lu
Life of this patent
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Abstract
An image brightness correction method is described. First, a pre-flash is fired and a pre-flash image is shot. After a main flash duration is estimated according to the pre-flash image and an automatic exposure time of a camera device, a main flash is fired and a raw image is shot. Then, a brightness gain of the raw image is compensated according to a preset gain threshold, and a digital brightness gain of the image is adjusted to enable the image shot each time to achieve the same brightness gain.
Claims6
An image brightness correction method, suitable for correcting a brightness gain of a shot image to a uniform level after a camera device shoots the image with a flash lamp turned on, the method comprising:
- firing a pre-flash and shooting an image according to the pre-flash;
- capturing an automatic exposure time of the camera device, and estimating a main flash duration according to the image and the automatic exposure time of the camera device;
- firing a main flash according to the main flash duration, and shooting a raw image;
- calculating a brightness gain value of the raw image, and calculating an inadequate brightness gain ratio of the raw image according to a preset gain threshold value;
- and
- according to the inadequate brightness gain ratio of the raw image, recalculating a color gain value of the raw image, and outputting the compensated color gain value as a preset image file.
Dependencies are inferred from the claim text.