Image forming apparatus and image processing apparatus
AssigneeCanon Kabushiki Kaisha
InventorGo Araki
Life of this patent
Estimating the term…
Abstract
In a case where another first region exists which faces the edge pixel across a second region on a line in a predetermined direction passing through the edge pixel of the first region, the correcting unit selects a correction amount for correcting the exposure amount applied by the exposing unit for the pixel to be corrected from information describing a plurality of correction amounts in accordance with a first number of pixels being a number of pixels on the line within the second region between the first region and the other first region and corrects the exposure amount for the pixel to be corrected in accordance with the selected correction amount.
Claims14
An image forming apparatus forming an image on basis of image data, the apparatus comprising:
- a photosensitive member;
- an exposing unit configured to expose the photosensitive member to light to form an electrostatic latent image;
- a developing unit configured to develop the electrostatic latent image on the photosensitive member by using a developing agent to form an image;
- a discriminating unit configured to, on basis of the image data, discriminate a first region being a region having a series of pixels with a pixel value equal to or higher than a predetermined value and a second region being a region having a series of pixels with a pixel value lower than the predetermined value;
- an identifying unit configured to identify a pixel to be corrected from the pixels within the first region on basis of identification information describing a relationship between an edge pixel positioned at an edge of the first region and the pixel to be corrected;
- and
- a correcting unit configured to correct an exposure amount applied by the exposing unit for the pixel to be corrected from an exposure amount described in the image data,
- wherein, in a case where another first region exists which faces the edge pixel across a second region on a line in a predetermined direction passing through the edge pixel of the first region, the correcting unit selects a correction amount for correcting the exposure amount applied by the exposing unit for the pixel to be corrected from information describing a plurality of correction amounts in accordance with a first number of pixels being a number of pixels on the line within the second region between the first region and the other first region and corrects the exposure amount for the pixel to be corrected in accordance with the selected correction amount.
An image processing apparatus supplying output image data for forming an image to an image forming apparatus having a photosensitive member, an exposing unit configured to expose the photosensitive member to light to form an electrostatic latent image, and a developing unit configured to develop the electrostatic latent image on the photosensitive member by using a developing agent to form an image, the image processing apparatus comprising:
- a discriminating unit configured to, on basis of input image data, discriminate a first region being a region having a series of pixels with a pixel value equal to or higher than a predetermined value and a second region being a region having a series of pixels with a pixel value lower than the predetermined value;
- an identifying unit configured to identify a pixel to be corrected from the pixels within the first region on basis of identification information describing a relationship between an edge pixel positioned at an edge of the first region and the pixel to be corrected;
- and
- a correcting unit configured to correct an exposure amount applied by the exposing unit for the pixel to be corrected from an exposure amount described in the image data to generate the output image data,
- wherein, in a case where another first region exists which faces the edge pixel across a second region on a line in a predetermined direction passing through the edge pixel of the first region, the correcting unit selects a correction amount for correcting the exposure amount applied by the exposing unit for the pixel to be corrected from information describing a plurality of correction amounts in accordance with a first number of pixels being a number of pixels on the line within the second region between the first region and the other first region and corrects the exposure amount for the pixel to be corrected in accordance with the selected correction amount.
Dependencies are inferred from the claim text.