Image processing method and apparatus thereof
First Claim
1. An image processing method for inputting color image data comprised of a plurality of color components and for carrying out color separation on the color image data so as to produce color image data having two color components, said method comprising the steps of:
- detecting a minimum value from among the plurality of color components;
mapping the color image data into a two-dimensional plane on the basis of the minimum value detected in the detecting step; and
generating the two color components on the basis of a hue defined by a point in the two-dimensional plane mapped in the mapping step.
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Abstract
The present invention is intended to provide an image processing apparatus capable of two-color output representation in high accuracy even with a full-colored original.
A color original is entered by an input means for prescan, a density distribution with respect to a hue is obtained for each electric signal of color image information, and a characteristic point of the color original image is obtained from the result of the density distribution. The two-color separation means separates a full-colored original to two colors free from the same color representation according to the information of the characteristic point obtained.
121 Citations
25 Claims
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1. An image processing method for inputting color image data comprised of a plurality of color components and for carrying out color separation on the color image data so as to produce color image data having two color components, said method comprising the steps of:
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detecting a minimum value from among the plurality of color components; mapping the color image data into a two-dimensional plane on the basis of the minimum value detected in the detecting step; and generating the two color components on the basis of a hue defined by a point in the two-dimensional plane mapped in the mapping step.
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2. An image processing method comprising the steps of:
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detecting a color distribution of a color image comprised of color image data; setting a reference axis to be used for carrying out color separation on the basis of the color distribution detected in said detecting step; and converting the color image data of the color image into color image data having two color components on the basis of the reference axis set in said setting step. - View Dependent Claims (3, 4, 5, 6)
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7. An image processing method comprising the steps of:
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converting color image data comprised of a plurality of color components into color image data having two color components on the basis of a reference axis; and outputting the two color components to an image forming unit which forms an image by using recording agents for two colors; wherein the reference axis substantially matches a hue of one of the recording agents used by the image formation unit.
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8. An image processing method comprising the steps of:
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inputting color image data; a first setting step for setting a space area including hue and saturation components; a second setting step for setting a density changing rate which corresponds to the space area set by the first setting step; and separating the color image data into color image data having two color components on the basis of the space area set in said first setting step and the density changing rate set in the second setting step. - View Dependent Claims (9, 10)
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11. An image processing apparatus for inputting color image data comprised of a plurality of color components and for carrying out color separation on the color image data so as to produce color image data having two color components, said apparatus comprising:
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detecting means for detecting a minimum value from among the plurality of color components; mapping means for mapping the color image data into a two-dimensional plane on the basis of the minimum value detected by the detecting means; and generation means for generating the two color components on the basis of a hue defined by a point in the two-dimensional plane mapped by the mapping means. - View Dependent Claims (12, 13, 14, 15)
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16. An image processing apparatus comprising:
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detecting means for detecting a color distribution of a color image comprised of color image data; setting means for setting a reference axis to be used for carrying out color separation on the basis of the color distribution detected by said detecting means; and converting means for converting the color image data of the color image into color image data having two color components on the basis of the reference axis set by said setting means. - View Dependent Claims (17, 18, 19, 20)
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21. An image processing apparatus comprising:
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converting means for converting color image data comprised of a plurality of color components into color image data having two color components on the basis of a reference axis; and outputting means for outputting the two color components to an image forming unit which forms an image by using recording agents for two colors; wherein the reference axis substantially matches a hue of one of the recording agents used by the image formation unit.
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22. An image processing apparatus comprising:
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inputting means for inputting color image data; first setting means for setting a space area including hue and saturation components; second setting means for setting a density changing rate which corresponds to the space area set by the first setting means; and separating means for separating the color image data into color image data having two color components on the basis of the space area set by the first setting means and the density changing rate set by the second setting means. - View Dependent Claims (23, 24)
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25. An image processing apparatus comprising:
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input means for entering color image data; area setting means for setting a space area including a desired hue and saturation; density variation ratio setting means for setting a density variation ratio corresponding to said space area, the density variation ratio defining densities of color components in the space area; and color separation means for separating input image data into color image data having two-color components according to said space area and the density variation ratio; wherein said area setting means and said density variation ratio setting means permit manual setting of the space area and the density variation ratio, respectively.
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Specification