Image data correcting device for correcting image data to remove back projection without eliminating halftone image
First Claim
1. An image data correcting device comprising:
- detecting means for detecting an intensity difference between first image data corresponding to a part of a predetermined small area and second image data corresponding to the remaining parts of the predetermined small area;
determining means for determining whether the first image data corresponds to a halftone image; and
intensity changing means for changing an intensity of the first image data to a predetermined low intensity, when the intensity difference is equal to or smaller than a first predetermined value and the first image data does not correspond to the halftone image and the intensity of the first image data is equal to or smaller than a second predetermined value.
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Accused Products
Abstract
An image data correcting device eliminates a back projection image without eliminating an image corresponding to a low-intensity halftone image. An intensity difference detection part detects an intensity difference between first image data corresponding to a part of a predetermined small area and second image data corresponding to the remaining parts of the predetermined small area. A halftone detection part determining whether the first image data corresponds to a halftone image. An intensity change part changes an intensity of the first image data to a predetermined low intensity, when the intensity difference is equal to or smaller than a first predetermined value and the first image data does not correspond to the halftone image and the intensity of the first image data is equal to or smaller than a second predetermined value.
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Citations
11 Claims
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1. An image data correcting device comprising:
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detecting means for detecting an intensity difference between first image data corresponding to a part of a predetermined small area and second image data corresponding to the remaining parts of the predetermined small area;
determining means for determining whether the first image data corresponds to a halftone image; and
intensity changing means for changing an intensity of the first image data to a predetermined low intensity, when the intensity difference is equal to or smaller than a first predetermined value and the first image data does not correspond to the halftone image and the intensity of the first image data is equal to or smaller than a second predetermined value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An image reading device comprising:
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scanning means for scanning an original document to obtain image data and converting the image data into digital form; and
an image data correcting device correcting the image data supplied by the canning means, wherein the image data correcting device comprising;
detecting means for detecting an intensity difference between first image data corresponding to a part of a predetermined small area and second image data corresponding to the remaining parts of the predetermined small area;
determining means for determining whether the first image data corresponds to a halftone image; and
intensity changing means for changing an intensity of the first image data to a predetermined low intensity, when the intensity difference is equal to or smaller than a first predetermined value and the first image data does not correspond to the halftone image and the intensity of the first image data is equal to or smaller than a second predetermined value.
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11. An image forming apparatus comprising:
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an image reading device generating image data by scanning an original document, said image reading device including an image data correcting device correcting the image data supplied by the image reading device; and
an image forming device forming a visible image based on the corrected image data supplied by the image data correcting device, wherein the image data correcting device comprising;
detecting means for detecting an intensity difference between first image data corresponding to a part of a predetermined small area and second image data corresponding to the remaining parts of the predetermined small area;
determining means for determining whether the first image data corresponds to a halftone image; and
intensity changing means for changing an intensity of the first image data to a predetermined low intensity, when the intensity difference is equal to or smaller than a first predetermined value and the first image data does not correspond to the halftone image and the intensity of the first image data is equal to or smaller than a second predetermined value.
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Specification