Image processing apparatus and image processing method
AssigneeCanon Kabushiki Kaisha
InventorsNobukazu Takahashi, Yasunori Fujimoto
Life of this patent
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Abstract
If a non-edge part of an image is thinned at a constant thinning ratio regardless of an image size (a character size or a line image width), a reduction in image density in the non-edge part becomes more conspicuous with increasing image size, which can lead to a reduction in image quality. In view of the above, the thinning ratio at which to thin data in the non-edge part of the image is determined depending on the image size. The thinning ratio is set to be smaller for images with sizes greater than or equal to a predetermined value than for images with sizes smaller than the predetermined value such that a high-quality image with sufficiently high density in its non-edge part is obtained regardless of the image size.
Claims10
An image processing apparatus comprising:
- an acquisition unit configured to acquire information associated with a size of an image;
- a determination unit configured to determine a thinning ratio at which data of a non-edge part of the image is to be thinned according to the information acquired by the acquisition unit;
- and
- a thinning unit configured to thin the data of the non-edge part according to the thinning ratio determined by the determination unit,
- wherein the thinning unit determines the thinning ratio such that the thinning ratio applied when the image has a first size is smaller than the thinning ratio applied when the image has a second size smaller than the first size.
An image processing apparatus comprising:
- an identification unit configured to identify an attribute of an image;
- an acquisition unit configured to, in a case where the identification unit identifies the attribute of the image as a character or a line image, acquire information associated with a size of the image identified as the character or the line image;
- a determination unit configured to determine a thinning ratio at which data of a non-edge part of the image is to be thinned according to the information acquired by the acquisition unit;
- and
- a thinning unit configured to thin the data of the non-edge part according to the thinning ratio determined by the determination unit,
- wherein the thinning ratio is determined such that when the size of the image is greater than or equal to a predetermined particular size, the thinning ratio is set to be smaller than when the size of the image is smaller than the predetermined particular size.
An image processing apparatus comprising:
- an acquisition unit configured to acquire information associated with a size of an image;
- a determination unit configured to determine a reduction ratio at which the amount of a recording material used to form a non-edge part of the image is to be reduced according to the information acquired by the acquisition unit;
- and
- a reduction processing unit configured to reduce the amount of the recording material used to form the non-edge part of the image according to the reduction ratio determined by the determination unit,
- wherein the reduction ratio is determined such that when the size of the image is greater than or equal to a predetermined particular size, the reduction ratio is set to be smaller than when the size of the image is smaller than the predetermined particular size.
An image processing method comprising:
- acquiring information associated with a size of an image;
- determining a thinning ratio at which data of a non-edge part of the image is to be thinned according to the acquired information;
- and
- thinning the data of the non-edge part according to the determined thinning ratio,
- wherein the thinning ratio is determined such that the thinning ratio applied when the image has a first size is smaller than the thinning ratio applied when the image has a second size smaller than the first size.
An image processing method comprising:
- identifying an attribute of an image;
- in a case where the attribute of the image is identified as a character or a line image, acquiring information associated with a size of the image identified as the character or the line image;
- determining a thinning ratio at which data of a non-edge part of the image is to be thinned according to the acquired information;
- and
- thinning the data of the non-edge part according to the determined thinning ratio,
- wherein the thinning ratio is determined such that the thin ratio applied when the image has a first size is smaller than the thinning ratio applied when the image has a second size smaller than the first size.
An image processing method comprising:
- acquiring information associated with a size of an image;
- determining a reduction ratio at which the amount of a recording material used to form a non-edge part of the image is to be reduced according to the acquired information;
- and
- reducing the amount of the recording material used to form the non-edge part of the image according to the determined reduction ratio,
- wherein the reduction ratio is determined such that when the size of the image is greater than or equal to a predetermined particular size, the reduction ratio is set to be smaller than when the size of the image is smaller than the predetermined particular size.
Dependencies are inferred from the claim text.