Image processing apparatus, image processing method, and computer-readable medium
AssigneeCanon Kabushiki Kaisha
InventorFumiaki Hirose
Life of this patent
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Abstract
An image processing apparatus, when correcting image data using correction information, corrects skew of the image in the sub-scanning direction that is formed by the image forming unit by correcting the image data also at an end portion of an area where an image forming unit forms the image.
Claims22
An image processing apparatus that corrects an image by displacing the image in a sub-scanning direction using correction information to offset skew of a scanning line in the sub-scanning direction caused by an image forming unit in exposure scanning, the image processing apparatus comprising:
- a generation unit configured to generate the correction information about an area including an area of the exposure scanning in a main-scanning direction based on skew information about the scanning line in the sub-scanning direction;
- and
- a correction unit configured to correct the image in an area of the exposure scanning in the main-scanning direction, using, out of the correction information generated by the generation unit, correction information about an area larger in the main-scanning direction than an area of the exposure scanning in the main-scanning direction.
An image processing method that corrects an image by displacing the image in a sub-scanning direction using correction information to offset skew of a scanning line in the sub-scanning direction caused by an image forming unit in exposure scanning, the image processing method comprising:
- generating the correction information about an area including an area of the exposure scanning in a main-scanning direction based on skew information about the scanning line in the sub-scanning direction;
- and
- correcting the image in an area of the exposure scanning in the main-scanning direction, using, out of the generated correction information, correction information about an area larger in the main-scanning direction than an area of the exposure scanning in the main-scanning direction.
A computer-readable storage medium storing a program for causing at least one processor to execute an image processing method for correcting an image by displacing the image in a sub-scanning direction using correction information to offset skew of a scanning line in the sub-scanning direction caused by an image forming unit in exposure scanning, the image processing method comprising:
- generating the correction information about an area including an area of the exposure scanning in a main-scanning direction based on skew information about the scanning line in the sub-scanning direction;
- and
- correcting the image in an area of the exposure scanning in the main-scanning direction, using, out of the generated correction information, correction information about an area larger in the main-scanning direction than an area of the exposure scanning in the main-scanning direction.
An image processing apparatus that corrects an image by displacing the image in a sub-scanning direction using correction information to offset skew of a scanning line in the sub-scanning direction caused by an image forming unit in exposure scanning, the image processing apparatus comprising:
- a generation unit configured to generate the correction information about an area including an area of the exposure scanning in a main-scanning direction based on skew information about the scanning line in the sub-scanning direction;
- and
- a correction unit configured to correct the image in an area of the exposure scanning in the main-scanning direction, using, out of the correction information generated by the generation unit, a part of correction information specified based on an area of the exposure scanning in the main-scanning direction.
An image processing method that corrects an image by displacing the image in a sub-scanning direction using correction information to offset skew of a scanning line in the sub-scanning direction caused by an image forming unit in exposure scanning, the image processing method comprising:
- generating the correction information about an area including an area of the exposure scanning in a main-scanning direction based on skew information about the scanning line in the sub-scanning direction;
- and
- correcting the image in an area of the exposure scanning in the main-scanning direction, using, out of the generated correction information, a part of correction information specified based on an area of the exposure scanning in the main-scanning direction.
An image processing apparatus that processes image data to form an image by an image forming unit, the image processing apparatus comprising:
- a generation unit configured to generate correction information to offset displacement of an image formed by the image forming unit in a sub-scanning direction;
- a determination unit configured to determine an application area in the main-scanning direction of the correction information based on a main-scanning width of the image forming unit;
- a first correction unit configured to perform correction by line shifting of the image data in the sub-scanning direction at a position in a main-scanning direction based on the correction information defined by the application area;
- a second correction unit configured to perform correction of pixel values of the image data based on the correction information defined by the application area to smooth line shifting step height generated by the correction performed by the first correction unit based on the correction information defined by the application area;
- and
- a transmission unit configured to transmit to the image forming unit the image data corrected by the first and second correction unit.
An image processing method for processing image data to form an image by an image forming unit, the image processing method comprising:
- generating correction information to offset displacement of an image formed by the image forming unit in a sub-scanning direction;
- determining an application area in the main-scanning direction of the correction information based on a main-scanning width of the image forming unit;
- correcting by line shifting of the image data in the sub-scanning direction at a position in a main-scanning direction based on the correction information defined by the application area;
- correcting pixel values of the image data based on the correction information defined by the application area to smooth line shifting step height generated by the correction performed by the first correction unit;
- and
- transmitting to the image forming unit the image data corrected by the first and second correction.
A computer-readable storage medium storing a program for causing at least one processor to execute an image processing method for forming an image by an image forming unit, the image processing method comprising:
- generating correction information to offset displacement of an image formed by the image forming unit in a sub-scanning direction;
- determining an application area in the main-scanning direction of the correction information based on a main-scanning width of the image forming unit;
- correcting by line shifting of the image data in the sub-scanning direction at a position in a main-scanning direction based on the correction information defined by the application area;
- and
- transmitting to the image forming unit the corrected image data.
Dependencies are inferred from the claim text.