Image processing apparatus, image processing method, and storage medium
First Claim
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1. An image processing apparatus comprising:
- an image acquisition unit configured to acquire image data;
a brightness acquisition unit configured to acquire brightness information relating to ambient brightness of a display area of an image based on the image data;
a control unit configured to control contrast of the image data acquired by the image acquisition unit, by using the brightness information acquired by the brightness acquisition unit, such that contrast corresponding to a first range of gradation values is higher in a first case where brightness information indicating a brightness lower than a predetermined brightness is acquired by the brightness acquisition unit in comparison with a second case where brightness information indicating a brightness higher than the predetermined brightness is acquired by the brightness acquisition unit, and such that contrast corresponding to a second range of gradation values is lower in the first case in comparison with the second case, wherein gradation values of the first range is less than the gradation values of the second range; and
a display control unit configured to display an image based on the image data whose contrast has been controlled by the control unit.
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Abstract
An image processing apparatus can correct the influence of contrast caused by a difference between a photopic vision and a scotopic vision to provide an image excellent in image quality. An averaged within-visual-field luminance calculation unit calculates a luminance value in the visual field based on at least one of environmental luminance in the visual field and luminance in a screen on which image data can be displayed. A reverse gamma conversion processing unit corrects the contrast of the image data based on the obtained luminance value in the visual field.
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Citations
19 Claims
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1. An image processing apparatus comprising:
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an image acquisition unit configured to acquire image data; a brightness acquisition unit configured to acquire brightness information relating to ambient brightness of a display area of an image based on the image data; a control unit configured to control contrast of the image data acquired by the image acquisition unit, by using the brightness information acquired by the brightness acquisition unit, such that contrast corresponding to a first range of gradation values is higher in a first case where brightness information indicating a brightness lower than a predetermined brightness is acquired by the brightness acquisition unit in comparison with a second case where brightness information indicating a brightness higher than the predetermined brightness is acquired by the brightness acquisition unit, and such that contrast corresponding to a second range of gradation values is lower in the first case in comparison with the second case, wherein gradation values of the first range is less than the gradation values of the second range; and a display control unit configured to display an image based on the image data whose contrast has been controlled by the control unit. - View Dependent Claims (2, 3, 4, 5, 18)
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6. A method for causing an image processing apparatus to perform image processing, the method comprising:
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acquiring image data; acquiring brightness information relating to ambient brightness of a display area of an image based on the image data; controlling contrast of the acquired image data by using the acquired brightness information, such that contrast corresponding to a first range of gradation values is higher in a first case where brightness information indicating a brightness lower than a predetermined brightness is acquired as the brightness information in comparison with a second case where brightness information indicating a brightness higher than the predetermined brightness is acquired as the brightness information, and such that contrast corresponding to a second range of gradation values is lower in the first case in comparison with the second case, wherein gradation values of the first range is less than the gradation values of the second range; and displaying an image based on the image data whose contrast has been controlled in the controlling. - View Dependent Claims (7)
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8. A non-transitory storage medium storing a computer-readable program that causes a computer to perform a method comprising:
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acquiring image data; acquiring brightness information relating to ambient brightness of a display area of an image based on the image data; controlling contrast of the acquired image data by using the acquired brightness information, such that contrast corresponding to a first range of gradation values is higher in a first case where brightness information indicating a brightness lower than a predetermined brightness is acquired as the brightness information in comparison with a second case where brightness information indicating a brightness higher than the predetermined brightness is acquired as the brightness information, and such that contrast corresponding to a second range of gradation values is lower in the first case in comparison with the second case, wherein gradation values of the first range is less than the gradation values of the second range; and displaying an image based on the image data whose contrast has been controlled in the controlling. - View Dependent Claims (9, 16, 17)
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10. An image processing apparatus comprising:
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an image acquisition unit configured to acquire image data; a brightness acquisition unit configured to acquire brightness information relating to both ambient brightness of a display area of an image based on the image data and brightness of the image data; a control unit configured to control contrast of the image data acquired by the image acquisition unit, by using the brightness information acquired by the brightness acquisition unit, such that the contrast corresponding to the image data is higher in a case where brightness information indicating a brightness lower than a predetermined brightness is acquired by the brightness acquisition unit in comparison with a case where brightness information indicating a brightness higher than the predetermined brightness is acquired by the brightness acquisition unit; and a display control unit configured to display an image based on the image data whose contrast has been controlled by the control unit. - View Dependent Claims (11, 12, 19)
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13. An image processing method comprising:
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acquiring image data; acquiring brightness information relating to both ambient brightness of a display area of an image based on the image data and brightness of the image data; controlling contrast of the acquired image data, by using the acquired brightness information relating to both the ambient brightness of the display area and the brightness of the image data such that the contrast corresponding to the image data is higher in a case where brightness information indicating a brightness lower than a predetermined brightness is acquired in the acquiring in comparison with a case where brightness information indicating a brightness higher than the predetermined brightness is acquired in the acquiring; and displaying an image based on the image data whose contrast has been controlled in the controlling. - View Dependent Claims (14, 15)
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Specification