-
公开(公告)号：US20130101301A1
公开(公告)日：2013-04-25
申请号：US13654227
申请日：2012-10-17
Applicant: CANON KABUSHIKI KAISHA
Inventor： Yoichi Takikawa , Hideki Kubo
IPC: G03G15/00
CPC classification number: H04N1/401 , G03G15/5058 , G03G15/55 , H04N1/4015 , H04N1/4078
Abstract: 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.
Abstract translation: 用于基于应用于表示图像的图像数据的电子照相处理来形成图像的图像形成装置包括被配置为执行用于图像形成的周期性移动的装置，存储单元，被配置为存储用于校正由该装置引起的浓度变化的表格 当所述设备的物理属性处于参考状态时，所述表最初生成，所述预测单元被配置为预测当所述物理属性处于与所述参考状态不同的状态时引起的所述变化的幅度，以及调整单元，被配置为 基于由预测单元预测的振幅来调整表。
-
公开(公告)号：US20210256662A1
公开(公告)日：2021-08-19
申请号：US17168033
申请日：2021-02-04
Applicant: CANON KABUSHIKI KAISHA
Inventor： Yoichi Takikawa
Abstract: 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.
-
公开(公告)号：US10068160B2
公开(公告)日：2018-09-04
申请号：US14983944
申请日：2015-12-30
Applicant: CANON KABUSHIKI KAISHA
Inventor： Ryosuke Otani , Yoichi Takikawa
Abstract: 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.
-
公开(公告)号：US09883076B2
公开(公告)日：2018-01-30
申请号：US15352437
申请日：2016-11-15
Applicant: CANON KABUSHIKI KAISHA
Inventor： Ryosuke Otani , Yoichi Takikawa , Hidenori Kanazawa , Hisashi Ishikawa
CPC classification number: H04N1/4092 , G03G15/5062 , G03G15/5087 , G06K15/1223 , G06K15/14 , G06K15/1874 , H04N1/06 , H04N1/29 , H04N1/407
Abstract: 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.
-
公开(公告)号：US20170155797A1
公开(公告)日：2017-06-01
申请号：US15352437
申请日：2016-11-15
Applicant: CANON KABUSHIKI KAISHA
Inventor： Ryosuke Otani , Yoichi Takikawa , Hidenori Kanazawa , Hisashi Ishikawa
CPC classification number: H04N1/4092 , G03G15/5062 , G03G15/5087 , G06K15/1223 , G06K15/14 , G06K15/1874 , H04N1/06 , H04N1/29 , H04N1/407
Abstract: 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.
-
Patent Agency Ranking
公开(公告)号：US08942576B2
公开(公告)日：2015-01-27
申请号：US13654227
申请日：2012-10-17
Applicant: Canon Kabushiki Kaisha
Inventor： Yoichi Takikawa , Hideki Kubo
CPC classification number: H04N1/401 , G03G15/5058 , G03G15/55 , H04N1/4015 , H04N1/4078
Abstract: 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.
Abstract translation: 用于基于应用于表示图像的图像数据的电子照相处理来形成图像的图像形成装置包括被配置为执行用于图像形成的周期性移动的装置，存储单元，被配置为存储用于校正由该装置引起的浓度变化的表格 当所述设备的物理属性处于参考状态时，所述表最初生成，所述预测单元被配置为预测当所述物理属性处于与所述参考状态不同的状态时引起的所述变化的幅度，以及调整单元，被配置为 基于由预测单元预测的振幅来调整表。
-
公开(公告)号：US08830524B2
公开(公告)日：2014-09-09
申请号：US13734831
申请日：2013-01-04
Applicant: Canon Kabushiki Kaisha
Inventor： Yoichi Takikawa , Hideki Kubo
CPC classification number: H04N1/04 , B41J2/471 , G03G15/50 , G03G2215/00042 , H04N1/409
Abstract: 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.
Abstract translation: 可防止带状物，降低图像质量下降。 图像处理装置包括：第一创建装置，被配置为基于图像数据的实际打印位置与基准位置之间的差异，将图像数据的浓度分配到另一扫描线上的像素，并且创建位置校正图像数据， 第二创建装置，被配置为使用与图像数据的位置相对应的校正值来校正图像数据，并且创建密度校正图像数据;以及生成装置，被配置为使用由第一图像数据创建的位置校正图像数据来生成输出图像数据 创建装置和由第二创建装置创建的密度校正图像数据。
-
8.发明授权公开(公告)号：US10671006B2
公开(公告)日：2020-06-02
申请号：US16438593
申请日：2019-06-12
Applicant: CANON KABUSHIKI KAISHA
Inventor： Ryosuke Otani , Yoichi Takikawa , Hisashi Ishikawa
Abstract: 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.
-
公开(公告)号：US09703230B2
公开(公告)日：2017-07-11
申请号：US14785290
申请日：2014-03-27
Applicant: CANON KABUSHIKI KAISHA
Inventor： Izuru Horiuchi , Yoichi Takikawa , Jun Hirabayashi
IPC: G03G15/00 , G03G15/043 , G03G15/04 , B41J2/47 , G02B26/12
CPC classification number: G03G15/043 , B41J2/471 , G02B26/127 , G03G15/04072
Abstract: 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.
-
公开(公告)号：US20160085172A1
公开(公告)日：2016-03-24
申请号：US14785290
申请日：2014-03-27
Applicant: CANON KABUSHIKI KAISHA
Inventor： Izuru Horiuchi , Yoichi Takikawa , Jun Hirabayashi
IPC: B41J2/385
CPC classification number: G03G15/043 , B41J2/471 , G02B26/127 , G03G15/04072
Abstract: 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.
Abstract translation: 激光相对于感光构件在主扫描方向上的入射角根据曝光位置而不同。 因此，感光构件上的激光的光点形状在主扫描方向上是不同的。 滤波器系数在主扫描方向上改变，并且用滤波器系数校正图像数据。
-
-
-
-
-
-
-
-
-
Search Results
24
records
(took 0.042 seconds)
