Image color discriminating apparatus, image color discriminating method and program
AssigneeMurata Machinery, Ltd.
InventorKenji Dokuni
Life of this patent
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Abstract
A method for discriminating a color of an object image. Whether unit data showing a color of a part of the object image corresponds to any position on a two-dimensional color plane is discriminated. A distribution value showing a width of a distribution range of the unit data in the color plane is acquired based on the discrimination result. Whether the object image corresponds to a full color image having mixed color expression, a specific color image not having mixed color expression or an achromatic color image is discriminated based on the distribution value.
Claims22
An image color discriminating apparatus that discriminates a color of an object image, comprising:
- a processor comprising:
- a unit discriminating section that discriminates whether unit data showing a color of a part of the object image corresponds to any position on a two-dimensional color plane;
- a distribution value acquiring section that acquires a distribution value showing a width of a distribution range of the unit data in the color plane, based on a discrimination result obtained by the unit discriminating section;
- an image discriminating section that discriminates based on the distribution value whether the object image corresponds to a full color image having mixed color expression, a specific color image not having mixed color expression or an achromatic color image of achromatic color;
- a lightness histogram generator that generates a histogram of a parameter of brightness, based on a color shown by the unit data;
- and
- a discriminating section that discriminates whether the object image corresponds to a gray-scale image having tone expression or a monochromatic image not having tone expression, based on the histogram of the parameter of brightness, when the object image is discriminated to be the achromatic color image.
An image color discriminating method for discriminating a color of an object image, comprising executing with a processor the steps of:
- (a) discriminating whether unit data showing a color of a part of the object image corresponds to any position on a two-dimensional color plane;
- (b) acquiring a distribution value showing a width of a distribution range of the unit data in the color plane, based on a discrimination result obtained in step (a);
- (c) discriminating based on the distribution value whether the object image corresponds to a full color image having mixed color expression, a specific color image not having mixed color expression or an achromatic color image;
- (d) generating a histogram of a parameter of brightness, based on a color shown by the unit data;
- and
- (e) discriminating whether the object image corresponds to a gray-scale image having tone expression or a monochromatic image not having tone expression, based on the histogram of the parameter of brightness, when the object image is discriminated to be the achromatic color image.
A program embodied in a non-transitory computer-readable medium for discriminating a color of an object image, to cause a computer to execute the steps of:
- (a) discriminating whether unit data showing a color of a part of the object image corresponds to any position in a two-dimensional color plane;
- (b) acquiring a distribution value showing a width of a distribution range of the unit data in the color plane, based on a discrimination result of the step (a);
- (c) discriminating based on the distribution value whether the object image corresponds to a full color image having mixed color expression, a specific color image not having mixed color expression or an achromatic color image;
- (d) generating a histogram of a parameter of brightness, based on a color shown by the unit data;
- and
- (e) discriminating whether the object image corresponds to a gray-scale image having tone expression or a monochromatic image not having tone expression, based on the histogram of the parameter of brightness, when the object image is discriminated to be the achromatic color image.
Dependencies are inferred from the claim text.