Apparatus and method for performing exposure on photoreceptor drum
AssigneeCanon Kabushiki Kaisha
InventorAtsushi Shoji
Life of this patent
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Abstract
In a case where a determination is made that a density of a pixel of interest is greater than a threshold, or in a case where a pixel having a greater density than the threshold is present in a neighborhood of the pixel of interest at a predetermined distance from the pixel of interest, exposure with intensity corresponding to a density of the pixel of interest to which a predetermined density has not been added is performed on a photoreceptor drum at a position corresponding to the pixel of interest. Otherwise, exposure with intensity corresponding to a density of the pixel of interest to which the predetermined density has been added is performed on the photoreceptor drum at the position corresponding to the pixel of interest.
Claims8
An apparatus comprising:
- a determination unit configured to determine whether a density of each pixel in image data is equal to or less than a threshold;
- and
- an adding unit configured to add a predetermined density to a density of each pixel,
- wherein,
- in a case where a determination is made that a density of a pixel of interest is greater than the threshold, or in a case where a pixel having a greater density than the threshold is present in a neighborhood of the pixel of interest at a predetermined distance from the pixel of interest,
- exposure with intensity corresponding to a density of the pixel of interest to which the predetermined density has not been added is performed on a photoreceptor drum at a position corresponding to the pixel of interest,
- otherwise,
- exposure with intensity corresponding to a density of the pixel of interest to which the predetermined density has been added is performed on the photoreceptor drum at the position corresponding to the pixel of interest.
A method comprising:
- a determination step of determining whether a density of each pixel in image data is equal to or less than a threshold;
- an adding step of adding a predetermined density to the density of each pixel;
- a step of performing exposure with intensity corresponding to to density of a pixel of interest to which the predetermined density has not been added, on a photoreceptor drum at a position corresponding to the pixel of interest, in a case where a determination is made that the density of the pixel of interest is greater than the threshold, or in a case where a pixel having a greater density than the threshold is present in a neighborhood of the pixel of interest at a predetermined distance from the pixel of interest;
- and
- a step of, otherwise, performing exposure with intensity corresponding to a density of the pixel of interest to which the predetermined density has been added, on the photoreceptor drum at the position corresponding to the pixel of interest.
Dependencies are inferred from the claim text.