Adjusting method of flash intensity
AssigneeAltek Corporation
InventorsChan Min Chou, Chung Pin Lu
Life of this patent
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Abstract
An adjusting method of flash intensity is applied in an image capture apparatus with a flash lamp, where two pre-flash images corresponding the object are retrieved under two different pre-flash lights, respectively, and then a flash intensity of main-flash light is calculated according to one of the retrieved pre-flash images, so as to retrieve a main-flash image corresponding the object under the main-flash light with the calculated main-flash light.
Claims17
An adjusting method of flash intensity, applied in an image capture apparatus with a flash lamp, the adjusting method comprising:
- emitting a first pre-flash light by the flash lamp when the image capture apparatus photographs an object;
- retrieving a first pre-flash image corresponding the object under the first pre-flash light;
- emitting a second pre-flash light by the flash lamp when the image capture apparatus shoots the object, wherein flash intensity of the second pre-flash light is different from flash intensity of the first pre-flash light;
- retrieving a second pre-flash image corresponding the object under the second pre-flash light;
- selecting one of the first pre-flash image and the second pre-flash image to be a determined pre-flash image according to luminance of the first pre-flash image and luminance of the second pre-flash image;
- calculating flash intensity of a main-flash light by utilizing the determined pre-flash image;
- emitting the main-flash light with the calculated flash intensity by the flash lamp;
- retrieving a main-flash image corresponding the object under the main-flash light;
- and
- outputting the retrieved main-flash image.
An adjusting method of flash intensity, applied in an image capture apparatus with a flash lamp, the adjusting method comprising:
- performing an automatic focusing before the image capture apparatus shoots an object;
- retrieving a focused image corresponding to the object after the automatic focusing is accomplished;
- emitting a first pre-flash light by the flash lamp;
- retrieving a first pre-flash image corresponding to the object under the first pre-flash light;
- emitting a second pre-flash light by the flash lamp, wherein a flash intensity of the second pre-flash light is different from a flash intensity of the first pre-flash light;
- retrieving a second pre-flash image corresponding to the object under the second pre-flash light;
- calculating a first luminance value of the first pre-flash image;
- calculating a second luminance value of the second pre-flash image;
- calculating a third luminance value of the focused image;
- comparing the first luminance value with the third luminance value to get a first difference value;
- comparing the second luminance value with the third luminance value to get a second difference value;
- comparing the first difference value with the second difference value to get a comparison result;
- selecting one of the first pre-flash image and the second pre-flash image to be a determined pre-flash image according to the comparison result;
- calculating a flash intensity by utilizing the determined pre-flash image;
- emitting a main-flash light with the calculated flash intensity by the flash lamp;
- retrieving a main-flash image corresponding to the object under the main-flash light;
- and
- outputting the retrieved main-flash image.
Dependencies are inferred from the claim text.