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Image forming apparatus
| Details |
Inventors: Eki, Koji; Nishi, Akihiro;
Assignee: Sharp Kabushiki Kaisha (Osaka, JP)
Primary Examiner: Reinhart; Mark J.
Assistant Examiner:
Attorney, Agent or Firm: Conlin; David G., Michaelis; Brian L.
An image forming apparatus including a bit map data generating section for generating binary dot data for each color from image data, an image memory for storing the dot data, an edge dot discriminating section for discriminating edge dots positioned in an edge section, such as a curved-line section, a slanted-line section of characters, graphics, photo images, etc. in dot data for black stored in the image memory, and a dot modulating circuit for modulating the dot data so that the edge dots and printing dots other than black ones become smaller than black printing dots other than the edge dots. With this arrangement, since linear tone can be obtained even in a section with a deep color, excellent tone can be obtained in multi-color printing such as full-color printing. Therefore, reproducibility of tone of binarized image data can be improved, and jaggedness in an edge section can be improved so as to have a smooth line. |
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DETAILED DESCRIPTION An object of the present invention is attained from a viewpoint that while characters, etc.
are mostly represented by only black component (namely, black and white), graphics, photo images, etc.
are mostly represented by half tone other than black.
Namely, the present invention is invented in view of the above conventional problem, and it is an object of the present invention to provide an image forming apparatus which is capable of removing jaggedness in an outline section of characters, graphics, etc.
(dejagging) even if discrimination is not made as to whether image data are image data of characters, etc.
or image data of graphics, photo images, etc.
, so as to have a smooth line and also of obtaining excellent tone in multi-color printing such as full-color printing at a low price.
In other words, it is an object of the present invention to provide an image forming apparatus which is capable of improving reproducibility of tone of binarized image data even if a complicated discriminating circuit and a controlling method, etc.
are not used, and also of removing jaggedness in an outline section of characters, graphics, etc.
so as to have a smooth line at a low price.
In order to achieve these objects, an image forming apparatus for printing an image to be printed by forming the image by a plurality of printing dots with a plurality of colors including black is characterized by including: dot data generating means for generating binary dot data for each color from image data; storing means for storing the dot data; edge dot discriminating means for discriminating edge dots positioned in an outline section of an image to be printed in black dot data stored in the storing means; and modulating means for modulating the dot data so that the edge dots and the printing dots other than black ones become smaller than the black printing dots other than the edge dots.
With the above arrangement, the dot data generating means generates binary dot data for each colour from image data
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Television 
