US 2025/0168290 A1Published application

Image forming apparatus

AssigneeCanon Kabushiki Kaisha

InventorTAICHI TAKEMURA

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Abstract

An image forming apparatus has an image processing unit that performs halftoning on image data and is controlled based on image forming conditions. The image forming unit forms an image based on image data on a sheet. A detection unit detects a detection image on the image carrier. A generation unit generates image forming conditions based on a detection result of the detection image. The image processing unit performs halftoning on the image data with a screen corresponding to attribute information of the image data, the screen including a first screen with a first number of screen lines and a second screen with a second number of screen lines greater than the first number of screen lines. The number of screen lines used for the detection image is greater than the number of lines of the first screen.

Claims19

Dependent claims

An image forming apparatus that forms an image on a sheet, comprising:

an image processor configured to perform halftone processing corresponding to an attribute of an image to be formed based on image data, the image processor outputting halftoned image data;
an image forming unit configured to be controlled on a basis of an image forming condition and form an image on a basis of the halftoned image data outputted by the image processor;
an image carrier on which a detection image is formed by the image forming unit;
a sensor configured to receive reflected light from the detection image;
and
a processor configured to:
control the image forming unit to form a detection image for tone correction, the detection image for tone correction being subjected to halftone processing,
control a tone characteristic of an image of a first attribute to be formed by the image forming unit on a basis of a light-receiving result of light reflected from a first detection image by the sensor, the first detection image being subjected to halftone processing corresponding to the first attribute,
control a tone characteristic of an image of a second attribute different from the first attribute to be formed by the image forming unit on a basis of a light-receiving result of light reflected from a second detection image by the sensor, the second detection image being subjected to halftone processing corresponding to the second attribute,
control the image forming unit to form a detection image for target maximum density correction, the detection image for target maximum density correction being subjected to error diffusion processing as the halftone processing regardless of an attribute of the image to be formed, and
generate the image forming condition for correcting a target maximum density of the image to be formed by the image forming unit on a basis of a light-receiving result of light reflected from the detection image for the target maximum density correction by the sensor.

8 more elements

An image forming apparatus that forms an image on a sheet, comprising:

an image processor configured to perform halftone processing corresponding to an attribute of an image to be formed based on image data, the image processor outputting halftoned image data;
an image forming unit configured to be controlled on a basis of an image forming condition and form an image on a basis of the halftoned image data outputted by the image processor;
an image carrier on which a detection image is formed by the image forming unit;
a sensor configured to receive reflected light from the detection image;
and
a processor configured to:
control the image forming unit to form a detection image for tone correction, the detection image for tone correction being subjected to halftone processing,
control a tone characteristic of an image of a first attribute to be formed by the image forming unit on a basis of a light-receiving result of light reflected from a first detection image by the sensor, the first detection image being subjected to halftone processing corresponding to the first attribute,
control a tone characteristic of an image of a second attribute different from the first attribute to be formed by the image forming unit on a basis of a light-receiving result of light reflected from a second detection image the sensor, the second detection image being subjected to halftone processing corresponding to the first attribute,
control the image forming unit to form a detection image for target maximum density correction, and
generate the image forming condition for correcting a target maximum density of the image to be formed by the image forming unit on a basis of a light-receiving result of light reflected from the detection image for the target maximum density correction by the sensor,
wherein the detection image for the target maximum density correction is an image subjected to halftone processing using a number of second screen lines greater than a number of first screen lines used in halftone processing corresponding to the first attribute.

9 more elements

Dependencies are inferred from the claim text.