Image processor, host unit for image processing, image processing method, and computer products
First Claim
1. An image processor comprising:
- an image determination unit that determines, based on a property of an image input, whether the image is a backlight image; and
a brightness correction unit that subjects at least a subject portion of the image to brightness correction that indicates correction of a dark part in the image, when the image determination unit determines that the image is the backlight image.
1 Assignment
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Accused Products
Abstract
In an image processor, an image property determination unit extracts a portion having extremely high luminance in image data as a high luminance pixel area, from the whole image, to determine the property of the input image data. An edge pixel extraction unit extracts pixels in the portion where the brightness level largely changes, for each of the respective pixels. A subject portion determination unit regards the position of the edge pixel as a boundary between the high luminance pixel area and the subject portion, based on the information for the extracted high luminance pixel area and the edge pixels. The subject portion determination unit then determines an area as the subject portion, the area being opposite to the high luminance pixel area with respect to the boundary. A brightness correction unit corrects the brightness of the subject portion and the high luminance pixel area.
36 Citations
19 Claims
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1. An image processor comprising:
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an image determination unit that determines, based on a property of an image input, whether the image is a backlight image; and
a brightness correction unit that subjects at least a subject portion of the image to brightness correction that indicates correction of a dark part in the image, when the image determination unit determines that the image is the backlight image. - View Dependent Claims (2, 3, 4, 5)
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6. A host unit for image processing, comprising:
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a storage unit that stores information for an image input;
an image processing unit including an image determination unit that reads information for the image from the storage unit, and determines, based on a property of the read image, whether the image is a backlight image; and
a brightness correction unit that subjects at least a subject portion included in the image to brightness correction that indicates correction of a dark part in the image, when the image determination unit determines that the image is the backlight image; and
an image data processing unit that prepares print data for operating an image forming apparatus from data for the image after the brightness correction, and outputs the print data to the image forming apparatus. - View Dependent Claims (7)
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8. An image processing method comprising:
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an image determining step of determining, based on a property of an image input, whether the image is a backlight image; and
a brightness correcting step of subjecting at least a subject portion of the image to brightness correction that indicates correction of a dark part of the image, when the image is determined as the backlight image. - View Dependent Claims (9, 10, 11, 12)
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13. An image processing program that allows a computer to execute:
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an image processing procedure including an image determining procedure for determining, based on a property of an image input, whether the image is a backlight image; and
a brightness correcting procedure for subjecting at least a subject portion of the image to brightness correction that indicates correction of a dark part in the image, when the image is determined as the backlight image; and
an image data processing procedure for preparing print data for operating an image forming apparatus from data for the image after the brightness correction, and outputting the print data to the image forming apparatus. - View Dependent Claims (14, 15, 16, 17)
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18. A computer-readable storage medium that stores an image processing program to allow a computer to execute:
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an image processing procedure including an image determining procedure for determining, based on a property of an image input, whether the image is a backlight image; and
a brightness correcting procedure for subjecting at least a subject portion included in the image to brightness correction that indicates correction of a dark part in the image, when the image is determined as the backlight image; and
an image data processing procedure for preparing print data for operating an image forming apparatus from data for the image after the brightness correction, and outputting the print data to the image forming apparatus. - View Dependent Claims (19)
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Specification