US 8,027,056 B2Granted

Image processing apparatus and control method thereof

AssigneeCanon Kabushiki Kaisha

InventorHajime Kaji

Life of this patent

Estimating the term…

Loading patent…

Abstract

An image area of a main scanning line is segmented into a plurality of regions, with a first image being formed that has a first number of pixels in each of the plurality of regions, and a second image being formed that has a second number of pixels in each of the plurality of regions that differs from the first number of pixels. A scaling factor of an image in each of the plurality of regions is derived thereafter, in accordance with a difference in size between the first image and the second image in each region, and a differential between the first number of pixels and the second number of pixels. A determination is made with respect to a number of pixels to be either added to, or subtracted from, each of the plurality of regions, in accordance with a total number of correction pixels in order to adjust the size of the image of the main scanning line, and the scaling factor. The image data of each of the plurality of regions is corrected in accordance with the determined number of pixels in each region.

Claims13

Dependent claims

An image processing apparatus for adjusting an image that is formed by image data of a main scanning line, by either adding pixels to the image data or deleting pixels from the image data, the image processing apparatus comprising:

a first image forming unit configured to segment an image area of the main scanning line into a plurality of regions and form a first image having a first number of pixels in each of the plurality of regions;
a second image forming unit configured to form a second image having a second number of pixels that differs from the first number of pixels, in each of the plurality of regions;
an arithmetic unit configured to derive a scaling factor of an image in each of the plurality of regions, in accordance with a difference in size between the first image and the second image in each of the plurality of regions, and a differential between the first number of pixels and the second number of pixels;
a determination unit configured to determine the number of supplemental pixels to be either added to, or subtracted from, each of the plurality of regions, based on a total number of correction pixels that are either added to, or subtracted from, the image area of the main scanning line, and the scaling factor that is derived by said arithmetic unit;
and
an image correction unit configured to correct the image data that is formed in each of the plurality of regions, in accordance with the number of supplemental pixels determined by said determination unit.

3 more elements

A control method of an image processing apparatus for adjusting an image that is formed by image data of a main scanning line, by either adding pixels to the image data or deleting pixels from the image data, the control method comprising the steps of:

segmenting an image area of the main scanning line into a plurality of regions and forming a first image having a first number of pixels in each of the plurality of regions;
forming a second image having a second number of pixels that differs from the first number of pixels, in each of the plurality of regions;
deriving a scaling factor of an image in each of the plurality of regions, in accordance with a difference in size between the first image and the second image in each of the plurality of regions, and a differential between the first number of pixels and the second number of pixels;
determining the number of supplemental pixels to be either added to, or subtracted from, each of the plurality of regions, based on a total number of correction pixels that are either added to, or subtracted from, the image area of the main scanning line, and the scaling factor that is derived in said deriving step;
and
correcting the image data that is formed in each of the plurality of regions, in accordance with the number of supplemental pixels determined in said determining step.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/168,367Filed 7 Jul 2008
Priority: JP 2007-1788066 Jul 2007
Published: US 2009/0009819 A18 Jan 2009
Granted: 27 Sep 2011
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

G03G 15/326
In which the charge pattern is formed dotwise, e.g. by a thermal head: by application of light, e.g. using a LED array
G02B 26/127
Using multifaceted mirrors: adaptive control of the scanning light beam, e.g. using the feedback from one or more detectors
G03G 15/0435
With means for controlling illumination or exposure: by introducing an optical element in the optical path, e.g. a filter
G03G 2215/0404
Exposure devices: laser