Image processing device, method, and storage medium for gamma correction based on illuminance
AssigneeCanon Kabushiki Kaisha
InventorShunsuke Chino
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Abstract
An illuminance calculation unit detects an illuminance of an image when the image is captured. Based on the detected illuminance, a gamma correction amount calculation unit corrects at least one of a minimum output luminance value and a maximum output luminance value in a gamma characteristic for correcting a gradation characteristic of a luminance of the image. A gamma setting unit corrects the gradation characteristic of the luminance of the image with the gamma characteristic corrected based on the illuminance.
Claims16
An image processing device comprising:
- at least one memory storing at least one program of instructions;
- and
- at least one processor that executes the at least one program of instructions to implement:
- an illuminance acquisition unit configured to acquire illuminance information indicating an illuminance of an image when the image is captured;
- and
- a setting unit configured to set a gradation characteristic of a luminance of the image,
- wherein the setting unit sets the gradation characteristic that has a first output luminance range in a case where the illuminance information acquired by the illuminance acquisition unit indicates a first illuminance, and sets the gradation characteristic that has a second output luminance range that is narrower than the first output luminance range in a case where the illuminance information acquired by the illuminance acquisition unit indicates a second illuminance that is lower than a first illuminance.
An image processing method comprising:
- acquiring illuminance information indicating an illuminance of an image when the image is captured;
- and
- setting a gradation characteristic of a luminance of the image,
- wherein the setting sets the gradation characteristic that has a first output luminance range in a case where the illuminance information acquired by the acquiring indicates a first illuminance, and sets the gradation characteristic that has a second output luminance range that is narrower than the first output luminance range in a case where the illuminance information acquired by the acquiring indicates a second illuminance that is lower than a first illuminance.
A non-transitory computer storage medium storing therein a program that when executed by a computer causes the computer to:
- acquire illuminance information indicating an illuminance of an image when the image is captured;
- and
- set a gradation characteristic of a luminance of the image,
- wherein the computer sets the gradation characteristic that has a first output luminance range in a case where the illuminance information acquired by the acquiring indicates a first illuminance, and sets the gradation characteristic that has a second output luminance range that is narrower than the first output luminance range in a case where the illuminance information acquired by the acquiring indicates a second illuminance that is lower than a first illuminance.
Dependencies are inferred from the claim text.