Image processing device and image processing method and storage medium
AssigneeCanon Kabushiki Kaisha
InventorYasuhiro Hino
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Abstract
Color data, originally corresponding to different colors, are converted to the same density when gray-scale conversion is performed, and no boundary is distinguished. When performing the gray-scale conversion, color data of an object adjacent to an object to be processed is referred to. As a result of such reference, even if it is detected that the object to be processed and the object adjacent to the object to be processed have different colors, but are converted to the same density by the gray-scale conversion, the gray-scale conversion is performed in such a manner that the boundary between the objects can be identified.
Claims21
An image processing device, comprising:
- processing means for obtaining color data and gray-scale converted value of a processing object and color data and gray-scale converted value of a processing object adjacent to said processing object;
- first determining means for determining whether the gray-scale converted value of said processing object is similar to the gray-scale converted value of the processing object adjacent to said processing object;
- second determining means for determining whether the color data of said processing object is different from the color data of the processing object adjacent to said processing object;
- and
- control means for, when said first, second determining means determines that the color data are different from each other and gray scales are similar to each other, control is performed to generate a difference in the gray-scale converted values of said processing object and the processing object adjacent to said processing object.
An image processing device, comprising:
- first processing means for obtaining gray-scale converted values of one page including a gray-scale converted value of a processing object;
- second processing means for calculating a density width of the gray-scale converted values of said one page;
- control means for expanding the density width of the gray-scale converted values of one page including the gray-scale converted value of said processing object in accordance with said density width;
- and
- determining means for determining a presence/absence of processing objects different in color and similar in gray-scale converted value in processing objects included in one page, wherein a processing by said control means is performed in accordance with a result of said determination.
An image processing method, comprising the steps of:
- performing processing to obtain color data and gray-scale converted value of a processing object and color data and gray-scale converted value of a processing object adjacent to said processing object;
- first determining whether the gray-scale converted value of said processing object is similar to the gray-scale converted value of the processing object adjacent to said processing object;
- second determining whether the color data of said processing object is different from the color data of the processing object adjacent to said processing object;
- and
- performing a control to, when it is determined by said first, second determining steps that the color data are different from each other and gray scales are similar to each other, generate a difference in the gray-scale converted values of said processing object and the processing object adjacent to said processing object.
The image processing method according to claim. 11, wherein the color data and the gray-scale converted value of said processing object are defined by the commands of said processing object and the color data and the gray-scale converted value of the processing object adjacent to said processing object are defined by the commands of the processing object adjacent to said processing object, and said commands are converted to an intermediate code, so that determination is performed by said determining steps.
An image processing method, comprising the steps of:
- performing a first processing to obtain gray-scale converted values of one page including a gray-scale converted value of a processing object;
- performing a second processing to calculate a density width of the gray-scale converted values of said one page;
- performing a control to expand the density width of the gray-scale converted values of one page including the gray-scale converted value of said processing object in accordance with said density width;
- and
- determining a presence/absence of processing objects different in color and similar in gray-scale converted value in processing objects included in one page, wherein a processing by said control step is performed in accordance with a result of said determining step.
A computer-readable storage medium capable of storing a program to achieve an image processing method, said method comprising:
- performing processing to obtain color data and gray-scale converted value of a processing object and color data and gray-scale converted value of a processing object adjacent to said processing object;
- first determining whether the gray-scale converted value of said processing object is similar to the gray-scale converted value of the processing object adjacent to said processing object;
- second determining whether the color data of said processing object is different from the color data of the processing object adjacent to said processing object;
- and
- performing a control to, when it is determined by said first, second determining steps that the color data are different from each other and gray scales are similar to each other, generate a difference in the gray-scale converted values of said processing object and the processing object adjacent to said processing object.
Dependencies are inferred from the claim text.