Canon Kabushiki Kaisha

Yoichi Takikawa

Ryosuke Otani

Hisashi Ishikawa

Hideki Kubo

Hidenori Kanazawa

Go Araki

Jun Hirabayashi

Izuru Horiuchi

Takashi Ochiai

Ayato Imai

Shun Matsui

An image processing apparatus includes a first image sensor unit configured to acquire a first image, a second image sensor unit having a characteristic different from that of the first image sensor unit and configured to acquire a second image, and a processor configured to generate detection information about an object based on the first image and to control driving of the second image sensor unit based on the detection information.

Image processing apparatus, control method, and storage medium

In an apparatus, it is determined whether a covariance matrix calculated based on a plurality of patches is abnormal. In a case where it is determined that the covariance matrix is not abnormal, the covariance matrix is used to perform first correction on pixels included in the plurality of patches. In a case where it is determined that the covariance matrix is abnormal, second correction, which is different from the first correction, is performed on the pixels included in the plurality of patches.

Image processing apparatus, image processing method, and storage medium

Provided is an image processing apparatus for correcting an influence of atmospheric turbulence by using pieces of image data captured temporally successively. It includes: an obtaining unit that obtains pieces of partial image data corresponding to images of a processing target area in the pieces of image data; a transform unit that transforms the obtained pieces of partial image data into Fourier spectra; an estimation unit that estimates a phase containing a high-frequency component by using phases of low-frequency components in the Fourier spectra; a correction unit that, on the basis of the result of the estimation and reference data determined on the basis of the obtained pieces of partial image data, corrects the result of the estimation on at least one of the pieces of partial image data; and a generation unit that generates output image data corresponding to the pieces of image data on the basis of the corrected result.

The image processing apparatus of the present invention includes: an edge determination unit configured to detect an edge pixel to which a white pixel and a black pixel are adjacent in a first direction in an image in which each pixel is represented as a white pixel or a black pixel; a first detection unit configured to detect a number of consecutive pixels up to the edge pixel in the first direction in the image; a second detection unit configured to detect a number of consecutive pixels whose number of consecutive pixels in the first direction is larger than a first threshold in a second direction perpendicular to the first direction in the image; and a type determination unit configured to determine a type of the edge pixel based on detection results by the first detection unit and detection results by the second detection unit.

Image processing apparatus, image processing method, and storage medium, that determine a type of edge pixel

The present invention performs inplane uneven density correction that suppresses a number of tone correction properties and has few correction residuals. Accordingly, a holding unit of an apparatus of the present invention holds a plurality of tone correction properties respectively corresponding to a plurality of spot diameters that divide a range of a spot diameter of a light exposed on a surface of a photoreceptor by a predetermined interval. In addition a setting unit sets a tone correction property selected from the plurality of tone correction properties based on a spot diameter on the photoreceptor for a pixel corresponding to pixel data C. A correction unit corrects the pixel data C based on the set tone correction property, to generate tone correction data Cc.

Tone correction image processing based on pixel formation position on a photoreceptor

An image forming apparatus of the present invention acquires first correction characteristics representing an output density for an input gradation value at a reference position in a main scanning direction and second correction characteristics representing a relative relationship of an output density at a predetermined position in the main scanning direction with the output density at the reference position in the main scanning direction. Then, the image forming apparatus corrects image data corresponding to the predetermined position in the main scanning direction based on the first correction characteristics and the second correction characteristics.

Image forming apparatus and density correction method in image forming apparatus based on correction characteristics

The present invention performs inplane uneven density correction that suppresses a number of tone correction properties and has few correction residuals. Accordingly, a correction unit corrects pixel data D based on a plurality of tone correction properties respectively corresponding to a plurality of spot diameters of a light to expose on a surface of a photoreceptor, and to generate a plurality of pieces of correction data Dand D. A setting unit sets a ratio Rb based on a spot diameter on the photoreceptor of a pixel corresponding to the pixel data D. A blending unit generates tone correction data Dc by blending the plurality of pieces of correction data Dand Dbased on the ratio Rb.

Image processing apparatus, method of controlling same, and image forming apparatus

An image forming apparatus includes a light emitting element group including a plurality of light emitting elements disposed at first intervals in a first direction, and configured to emit optical beams based on image data, a lens array including a plurality of lenses disposed at second intervals different from the first intervals in the first direction and configured to focus or condense the light emitted from the light emitting element group, and a halftone processing unit configured to perform halftone processing by using a dither matrix corresponding to a relative positional relationship between the plurality of light emitting elements and the plurality of lenses to generate the image data.

Image processing apparatus and method for controlling the same

An incidence angle of laser light with respect to a photosensitive member in a main-scanning direction is different depending on an exposure position. Hence, the spot shape of the laser light on the photosensitive member is different in the main-scanning direction. A filter coefficient is changed in the main-scanning direction, and image data is corrected with the filter coefficient.

Image forming apparatus

An image forming apparatus includes a reading unit for sequentially reading, from image data, pieces of pixel data of target pixels along a predetermined direction, a cumulative sum calculation unit for calculating a cumulative sum of gradation values represented by pieces of pixel data of target pixels in a significant image portion read by the reading unit, a determination unit for determining whether the target pixel read by the reading unit is located at a boundary between the significant image portion and a background portion that is a non-significant image portion, and a correction unit for correcting, if the determination unit determines that the target pixel is located at the boundary, a gradation value represented by pixel data of the target pixel by adding a correction amount based on the cumulative sum up to the target pixel calculated by the cumulative sum calculation unit to the gradation value.

Image formation with gradation value of boundary pixels corrected using cumulative sum of grataion values of pixels in significant image portion

Image forming apparatus correcting unevenness of potential distribution due to change of exposure spot shape of light beam on photosensitive member

An image forming apparatus for forming an image based on an electrophotographic process applied to image data that represents the image includes a device configured to perform a periodic movement for image formation, a storage unit configured to store a table for correcting density variation caused by the device, the table initially generated when a physical property of the device is in a reference state, a prediction unit configured to predict an amplitude of the variation caused when the physical property is in a state different from the reference state, and an adjustment unit configured to adjust the table based on the amplitude predicted by the prediction unit.

Image forming apparatus and image forming method

There is provided an image forming apparatus comprising: detection means for detecting position information indicating a scanning position; interval prediction means for predicting a first scanning line interval indicating a distance in the sub-scanning direction between the scanning line of interest and a succeeding scanning line to be scanned after the scanning line of interest; interval calculation means for calculating, by using the position information held by the holding means, a second scanning line interval indicating a distance in the sub-scanning direction between the scanning line of interest and the scanned scanning line; and rate calculation means for calculating a correction rate on an exposure amount for the scanning line of interest so that a predicted density calculated using the first scanning line interval and the second scanning line interval matches with a predicted density calculated using a predetermined reference scanning line interval.

Image processing apparatus, image processing method and program

Banding can be prevented and image-quality degradation can be reduced. An image processing apparatus includes first creation means configured to distribute density of image data to a pixel on another scanning line on the basis of a difference between an actual print position of the image data and a reference position and to create position-corrected image data, second creation means configured to correct the image data using a correction value corresponding to a position of the image data and to create density-corrected image data, and generation means configured to generate output image data using the position-corrected image data created by the first creation means and the density-corrected image data created by the second creation means.

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Kawasaki, Japan

Yoichi Takikawa