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US 8,797,615 B2Granted
Image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorTomohisa Itagaki
Life of this patent
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Abstract
An image forming apparatus includes an image forming station for forming a pattern image on a recording material; an image reading station for reading a pattern image formed on a recording material by the image forming station; and a tone gradation corrector for calculating a halftone dot area property on the basis of the density of the pattern image read by the image reading station and for executing tone gradation correction in the image forming station on the basis of the calculated halftone dot area property.
Claims16
An image forming apparatus comprising:
- an image forming unit configured to form an image on a recording material with a halftone dot area percentage changed to provide a density corresponding to an input signal;
- a reading unit configured to read a recording material having an image formed by said image forming unit;
- a determining unit configured to determine first data for correcting a relation between an input signal and a density of the image to be formed by said image forming unit and second data for correcting a relation between an input signal and a halftone dot area percentage corresponding to a density of the image to be formed by image forming unit, on the basis of a reading result of the recording material on which a plurality of images having different densities are formed by said image forming unit;
- and
- a correcting unit configured to correct the input signal before being input to said image forming unit, using one of the first data or the second data determined by said determining unit.
2 more elements
An image forming apparatus comprising:
- a correction unit configured to:
- correct image data based on a first tone correction data in a copy mode, and
- correct image data based on a second tone correction data in a printing mode;
- an image forming unit configured to form an image on a recording material based on the image data corrected by the correction unit;
- a controller configured to control the image forming unit to form a pattern image;
- a reading unit configured to read the recording material carrying the pattern image;
- a generation unit configured to:
- generate the first tone correction data based on a pattern image data contained in a reading result of the reading unit, and
- generate the second tone correction data based on the pattern image data and a density of the recording material corresponding to the reading result of the reading unit.
6 more elements
Dependencies are inferred from the claim text.