JP2006297634A5

JP2006297634A5 -

Info

Publication number: JP2006297634A5
Application number: JP2005118984A
Authority: JP
Filing date: 2005-04-15
Publication date: 2008-05-29
Anticipated expiration: 2025-04-15

Claims

An image forming apparatus having an image bearing member, an exposure unit that exposes the image bearing member, and an image forming unit that has a developing unit that visualizes an electrostatic latent image generated by exposure with a recording material,
Shift amount storage means for storing shift amount information indicating the shift amount of the exposure position in the sub-scanning direction when exposing while scanning the image carrier in the main scanning direction;
On the basis of the shift amount, and the error correction amount calculating means for calculating a deviation correction amount for correcting the misalignment in the sub-scanning direction,
Image data storage means for storing image data composed of a plurality of pixel data generated from print data ;
Attribute data storage means for storing attribute information representing the attribute of the pixel data generated from the print data, and image data composed of a plurality of pixel data based on a shift amount in pixel units among the shift correction amounts Correction means for correcting the deviation in pixel units,
Concentration conversion means for converting pixel density based on a deviation amount of less than a pixel unit of the deviation correction amount for the pixel data corrected by the correction means,
An image forming apparatus, wherein the intensity of pixel density conversion by the density conversion means is switched at least according to the type of image determined by the attribute information.

Furthermore, in addition to the attribute information, the intensity conversion strength of the pixel data by the density conversion means is switched according to a feature based on an image data pattern composed of pixels in a predetermined area centered on the target pixel. The image forming apparatus according to claim 1.

A halftone processing unit that performs halftone processing of the pixel data density conversion prior SL density conversion means,
Exception processing means for performing exception processing of the pixel data subjected to density conversion in the density conversion means;
The image forming apparatus according to claim 2 , wherein one of the exception processing unit and the halftone processing unit is selected according to the feature.

A coefficient for converting the pixel density is determined according to at least the type of the image determined by the attribute information , and the coefficient is a coefficient for dispersing the pixel density in the sub-scanning direction. The image forming apparatus according to claim 1 .

A coefficient for converting the pixel density is determined according to at least the type of image determined by the attribute information , and the coefficient is a coefficient for dispersing the pixel density of a predetermined multiple in the sub-scanning direction. The image forming apparatus according to claim 1 , wherein:

At least a factor for converting the type of the pixel density I follow the of the image determined by the attribute information is determined, in that the coefficient is a coefficient for not dispersing the pixel density in the sub scanning direction The image forming apparatus according to claim 1 , wherein:

Pattern storage means for storing a pattern image corresponding to the attribute information;
The image forming apparatus according to claim 2, wherein the feature is detected based on a pattern image including pixels in a predetermined area centered on the target pixel in addition to the attribute information .

An image bearing member, an exposure unit that exposes the image bearing member, and an image forming unit that has a developing unit that visualizes the electrostatic latent image generated by the exposure with a recording material. A method for controlling an image forming apparatus including a deviation amount storage unit that stores deviation amount information representing a deviation amount of an exposure position in a sub-scanning direction when performing exposure while scanning in a scanning direction,
On the basis of the shift amount, and the color shift correction amount calculating step of calculating a not Re correction amount for correcting the misalignment in the sub-scanning direction,
A storage step of storing image data composed of a plurality of pixel data generated from the print data in an image data storage unit;
An attribute data storage step of storing attribute information representing the attribute of the pixel data generated from the print data;
A correction step of correcting a pixel unit shift for image data composed of a plurality of pixel data based on a pixel unit color shift amount among the shift correction amount;
A density conversion step of converting pixel density based on a shift amount less than a pixel unit of the shift correction amount for the pixel data corrected in the correction step;
A switching step of switching the intensity of pixel density conversion by the density conversion means according to at least the type of image determined by the attribute information;
An image forming apparatus control method comprising:

Furthermore, in addition to the attribute information, the intensity conversion strength of the pixel data in the density conversion step is switched according to a feature based on an image data pattern composed of pixels in a predetermined area centered on the target pixel. The method of controlling an image forming apparatus according to claim 8.

A halftone processing step of performing halftoning the pixel data density conversion prior SL density conversion process,
The method further comprises an exception processing step for performing exception processing of the pixel data subjected to density conversion in the density conversion step, and a selection step for selecting either the exception processing step or the halftone processing step according to the characteristics. The method of controlling an image forming apparatus according to claim 9.

A coefficient for converting the pixel density is determined according to at least the type of the image determined by the attribute information , and the coefficient is a coefficient for dispersing the pixel density in the sub-scanning direction. The method of controlling an image forming apparatus according to claim 8.

A coefficient for converting the pixel density is determined according to at least the type of image determined by the attribute information , and the coefficient is a coefficient for dispersing the pixel density of a predetermined multiple in the sub-scanning direction. The method of controlling an image forming apparatus according to claim 8, wherein:

The coefficient for converting the pixel density is determined according to at least the type of image determined by the attribute information , and the coefficient is a coefficient for preventing the pixel density from being dispersed in the sub-scanning direction. Item 9. A method for controlling an image forming apparatus according to Item 8.

A pattern storing step of storing a pattern image corresponding to the attribute information, wherein the feature is detected based on a pattern image composed of pixels in a predetermined area centered on the target pixel in addition to the attribute information. The method of controlling an image forming apparatus according to claim 9 .

Computer program for executing a method of controlling an image forming apparatus according to a computer in any one of claims 8 to 14.