Canon Kabushiki Kaisha

Other

Tomohisa Itagaki

Nobuhiko Zaima

Nobuatsu Sasanuma

Yasuhito Shirafuji

Takahiro Ishihara

Toshio Saishoji

Miyoko Hayashi

Masami Tomita

Satoshi Takayama

Mitsuhiko Sato

Katsuhide Koga

Tatsuya Goto

Taichi Takemura

Aya Ito

Takaaki Yano

Kazuo Suzuki

Yuichi Ikeda

Jiro Ishizuka

Kenichi Hirota

Koji Takahashi

Hiroyuki Takahashi

Hideki Ogawa

Tsutomu Nishida

Makoto Kanbayashi

Hiroki Uematsu

Kenichi Nakagawa

Ryo Hanashi

Yasuhiro Kawai

Takahiro Mitsui

An image forming apparatus includes an image forming unit (LBP) to form an image on a sheet, a conveyance unit configured to convey the sheet, a sensor, which is configured to move in a direction perpendicular to a conveying direction in which the conveyance unit conveys the sheet, and to read the image on the sheet, and a controller. The image forming unit forms a first trigger image and a first pattern image on the sheet, and the image forming unit forms a second trigger image and a second pattern image at a position on the sheet different from a position of both the first trigger image and the first pattern image in the conveying direction. A formation area of the first trigger image in the direction perpendicular to the conveying direction overlaps with a formation area of the second pattern image.

Image forming apparatus

An image processing system includes an image forming apparatus, and an image processing apparatus connected to the image forming apparatus. The image forming apparatus forms an image, acquires a chromaticity value that is a result of measurement of a sheet on which the image is formed with use of a sensor in which a characteristic of a light source is fixed, and transmits the acquired chromaticity value to the image processing apparatus. The image processing apparatus receives the transmitted chromaticity value, specifies a condition when the result of the measurement using the sensor is acquired, and converts the received chromaticity value with use of the specified condition and information regarding an amount of an optical brightening agent contained in the sheet on which the image is formed.

Image processing system, control method, and storage medium

An image processing apparatus includes an acquisition unit configured to acquire a chromaticity value, which is a measurement result for a sheet to be measured, by using a sensor in which a light source has fixed characteristics; a designation unit configured to designate a condition under which the measurement result is acquired by the sensor; a determination unit configured to determine an optical brightening agent amount contained in the sheet; and a chromaticity value conversion unit configured to convert the chromaticity value, which is acquired by the acquisition unit, by using the condition designated by the designation unit and information about the optical brightening agent amount determined by the determination unit.

Image processing apparatus, method and storage medium

A chromaticity value, which is a measurement result for a sheet to be measured, is acquired by using a sensor in which a light source has fixed characteristics, a condition under which the measurement result is acquired by the sensor is designated, an optical brightening agent amount contained in the sheet is determined by using a spectral reflectance obtained by performing measurement on the sheet with use of the sensor, and the acquired chromaticity value is converted by using the designated condition and information about the determined optical brightening agent amount.

An image forming apparatus forms an image on a sheet and conveys the sheet through a conveying path. The image forming apparatus includes a color detection sensor which detects a detection image formed on the sheet for generating an image forming condition and a white reference plate used to calibrate the color detection sensor. The white reference plate is arranged opposite to the color detection sensor with the conveying path interposed therebetween at a position where the white reference plate is not concealed by the sheet when viewed from the color detection sensor when the sheet is conveyed to the conveying path. The detection image is formed on a white reference plate side of the sheet. The color detection sensor reads the white reference plate and is calibrated according to a read result.

Image forming apparatus generating image forming condition based on detected images

An image forming apparatus includes a printer, a sensor that measures a measurement image, and a controller that selects a layout including a plurality of test images and a separator, controls the printer to print the plurality of test images and the separator on the sheet, controls the sensor to measure the plurality of test images, and obtains measurement data related to the plurality of test images. The controller also generates a conversion condition based on the measurement result of the plurality of test images and the obtained measurement data. The conversion condition is used to convert the measurement result of the plurality of test images into a measurement result of an external measurement device.

Image forming apparatus communicably connected to an external measurement device that measures a measurement image for a calibration operation, and a related image processing apparatus

In an image forming apparatus, when images are formed on a plurality of sheets, a controller controls an image forming unit to form a measurement image between an image which is to be transferred to a first sheet of the plurality of sheets and an image which is to be transferred to a second sheet of the plurality of sheets, controls a sensor to measure the measurement image, determines a feedback condition based on a length of each of the plurality of sheets in a conveyance direction, and controls an image forming condition based on a result of measurement performed by the sensor and the determined feedback condition, wherein the image which is to be transferred to the second sheet of the plurality of sheets is adjacent to the image which is to be transferred to the first sheet of the plurality of sheets on an image bearing member.

Image forming apparatus performing density adjustment control

An image forming apparatus includes an image bearing member; a toner image forming device; an image transferring device; a transfer bias applying device; an image fixing device; a sensor for detecting light reflected by the toner image fixed on the sheet; a controller for controlling a leading portion bias applied to the leading portion of the sheet with respect to a sheet feeding direction and a central portion bias applied to the central area of the sheet. The controller forms first and second test images on the leading and central portions, respectively, and sets conditions of the leading and central portion biases on the basis of an output of the sensor, in correlation with a kind of the sheet. A toner deposition amount per unit area of the first test image is smaller than that of the second test image.

Image forming apparatus controlling conditions of applied bias based on test image

The image forming apparatus includes: a measuring unit configured to measure reflected light from a test sheet, the measuring unit including a first sensor and a second sensor, a generation unit configured to generate information regarding a color of a plurality of measurement images based on a measurement result by the measuring unit; and a detection unit configured to detect a sensor that has output an abnormal measurement result in the measuring unit, based on the measurement result. The detection unit is further configured to detect a sensor that has output the abnormal measurement result, based on measurement results obtained by the measuring unit regarding reflected light from a predetermined region of the test sheet. The predetermined region corresponds to a region on which the plurality of measurement images are not formed.

Image forming apparatus for forming test pattern on sheet using coloring material of plurality of colors

Temperature of a printing mediumis sufficiently decreased by stopping the printing mediumin a discharge path, conveying the printing medium at a low speed, switching a conveyance path, or the like. If the temperature of the printing mediumcan be sufficiently decreased, the thermochromism phenomenon is suppressed. As a result, it is possible to provide an image forming apparatus capable of achieving highly accurate color matching and color stability.

An image forming apparatus includes a conversion unit, an image forming unit, a controller, a conveyance unit, a measurement unit, a determination unit, an adjustment unit, and a generation unit. The conversion unit converts image data based on conversion condition. The image forming unit forms and fixes an image to a sheet. The controller controls to create first and second test sheets having respective reference and measurement images. The first and second test sheets are conveyed. The test images are measured. The determination unit determines first and second information regarding positions. The adjustment unit adjusts an image forming condition based the measured test images. The conversion condition is generated based on a second measurement result. A first reference image length in a direction in which the first test sheet is conveyed is longer than a second reference image length in a direction in which the second test sheet is conveyed.

An image forming apparatus includes a conversion unit, an image bearing member, an image forming unit that forms an image on the image bearing member based on image data converted by the conversion unit, a measuring unit that measures a measurement image on the image bearing member, and a controller that controls the image forming unit to form a first measurement image, controls the measuring unit to measure the first measurement image, and generates a conversion condition based on a result of measurement of the first measurement image and a first feedback condition. In forming a chromatic color image after a predetermined number of monochrome images, the controller controls the image forming unit to form a second measurement image, controls the measuring unit to measure the second measurement image, and generates the conversion condition based on a result of measurement of the second measurement image and a second feedback condition.

Image forming apparatus that generates conversion condition based on measurement result and first coefficient, and where chromatic color image is formed after predetermined number of monochrome images, generates conversion condition based on new measurement result and second coefficient

An image forming apparatus includes a conversion unit, a correction unit, an image forming unit, a measurement unit, first, second, and third generation units, a reading unit, an input unit, and a determination unit. Image data of a color components indicating one pixel based on a multidimensional table is converted and then corrected based on one-dimensional tables corresponding to the color components. An image is formed on a sheet based on the corrected image data. A measuring image formed on the sheet is measured. The multidimensional table can be generated based on a multi-color first measuring image. The one-dimensional table can be generated based on a second measuring image. A pattern image formed on the sheet is read. The one-dimensional table can be generated based on a pattern image for each of the color components on the sheet. Input user instructions indicated how the one-dimensional table is generated.

An image forming apparatus includes an image forming unit configured to form measurement images used for density correction at different timings using pseudo halftone processing patterns and a density detection sensor for detecting density of an object to be detected on an optical path including the formed measurement image. Further, the image forming apparatus includes a shutter which is arranged in the optical path between a density detection sensor and the measurement image, changed, by a motor, to a closed state in which a detecting surface of the density detection sensor is closed when the measurement image is not detected, and changed to an open state in which the detecting surface of the density detection sensor is opened when the measurement image is detected. Further, the image forming apparatus includes a controller which changes an image forming condition based on the detection result of the density detection sensor.

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Abiko, Japan

Tomohisa Itagaki