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US 10,650,504 B2Granted
Image processing apparatus, and image processing method
AssigneeCanon Kabushiki Kaisha
InventorAkihito Shin
Life of this patent
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Abstract
An apparatus includes a first brightness value acquisition unit configured to obtain a first absolute brightness value by converting a representative brightness value of an image obtained using an image pickup unit, into absolute brightness, a first determination unit configured to determine an output value based on an input-output characteristic of an output device, the output value corresponding to the first absolute brightness value obtained by the first brightness value acquisition unit, and a second determination unit configured to determine information about exposure corresponding to the output value.
Claims17
An apparatus comprising circuitry configured to perform
- first brightness obtaining process to obtain a first code corresponding to a first absolute brightness value by converting a representative brightness value of a first image obtained by capturing an object image, into absolute brightness,
- first determining process to determine, based on an input-output characteristic of an output device, a second code indicating an output value corresponding to the first code, and
- second determining process to determine information about an exposure control amount so that a code corresponding to a representative brightness value of a second image that is obtained after the first image by capturing an object image is same as the second code,
- wherein the first determining process includes using a calculation formula indicating the input-output characteristic of the output device corresponding to a graph,
- the apparatus further comprising the circuitry configured to perform second brightness obtaining process to obtain a third code corresponding to a second absolute brightness value by converting into absolute brightness a reference brightness value corresponding to a predetermined reflectance in the image obtained by capturing the object image,
- wherein the first brightness obtaining process obtains the first absolute brightness value based on information about a ratio about a difference between a code corresponding to the representative brightness value of the first image and the third code and information about the second absolute brightness value obtained by the second brightness obtaining.
3 more elements
A control method for an apparatus comprising:
- first brightness obtaining process to obtain a first code corresponding to a first absolute brightness value by converting a representative brightness value of a first image obtained by capturing an object image into absolute brightness;
- first determining process to determine, based on an input-output characteristic of an output device configured to output the image, a second code indicating an output value corresponding to the first code;
- and
- second determining process to determine information about an exposure control amount so that a code corresponding to a representative brightness value of a second image that is obtained after the first image by capturing an object image is same as the second code,
- wherein the first determining process includes using a calculation formula indicating the input-output characteristic of the output device corresponding to a graph,
- the method further comprising second brightness obtaining process to obtain a third code corresponding to a second absolute brightness value by converting into absolute brightness a reference brightness value corresponding to a predetermined reflectance in the image obtained by capturing the object image,
- wherein the first brightness obtaining process obtains the first absolute brightness value based on information about a ratio about a difference between a code corresponding to the representative brightness value of the first image and the third code and information about the second absolute brightness value obtained by the second brightness obtaining.
4 more elements
A non-transitory computer-readable storage medium storing a program for causing a computer to execute a control method for an apparatus, the control method comprising
- first brightness obtaining process to obtain a first code corresponding to a first absolute brightness value by converting a representative brightness value of a first image obtained by capturing an object image into absolute brightness,
- first determining process to determine, based on an input-output characteristic of an output device configured to output the image, a second code indicating an output value corresponding to the first code, and
- second determining process to determine information about an exposure control amount so that a code corresponding to a representative brightness value of a second image that is obtained after the first image by capturing an object image is same as the second code,
- wherein the first determining process includes using a calculation formula indicating the input-output characteristic of the output device corresponding to a graph,
- the non-transitory computer readable storage medium further comprising second brightness obtaining process to obtain a third code corresponding to a second absolute brightness value by converting into absolute brightness a reference brightness value corresponding to a predetermined reflectance in the image obtained by capturing the object image,
- wherein the first brightness obtaining process obtains the first absolute brightness value based on information about a ratio about a difference between a code corresponding to the representative brightness value of the first image and the third code and information about the second absolute brightness value obtained by the second brightness obtaining.
3 more elements
Dependencies are inferred from the claim text.