Patents by Inventor Katsuhiro Ishido

Katsuhiro Ishido has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20200128152
    Abstract: An original image is read as an aggregate of a plurality of pixels in which adjacent pixels have different colors (R, G, and B) in a main scanning direction and in a sub-scanning direction, and the read pixels of the respective colors are stored in a line memory in association with information on relative positions of the pixels with respect to another pixel. Then, the stored pixels are sorted so that pixels having the same color are adjacent to each other, and an abnormal pixel (dust) not present in the original image is detected based on the state of the sorted pixels. With this, the dust not present in the original image is detected without increasing the cost, and the dust is corrected without forming a conspicuous trace of correction.
    Type: Application
    Filed: December 19, 2019
    Publication date: April 23, 2020
    Inventors: Daisuke Akagi, Katsuhiro Ishido
  • Patent number: 10582092
    Abstract: An image reading apparatus includes a front-side reader, which includes a white LED configured to irradiate an original with light and a CMOS sensor configured to receive light that is reflected by the original. The front-side reader is configured to generate read data that represents a luminance value of an image on the original from the result of receiving light with the CMOS sensor. The image reading apparatus stores, in a non-volatile memory, a condition for determining whether there is a sub-scanning color shift, and uses a sub-scanning color shift detector to determine whether there is a sub-scanning color shift based on the read data obtained from the front-side reader and the condition stored in the non-volatile memory. When there is a sub-scanning color shift, the image reading apparatus corrects the sub-scanning color shift by correcting the read data with a color shift corrector.
    Type: Grant
    Filed: May 10, 2017
    Date of Patent: March 3, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventors: Katsuhiro Ishido, Daisuke Akagi
  • Publication number: 20200057408
    Abstract: An optical sensor includes a first LED, a second LED, a first PD, and a second PD. The first LED and the second LED are configured to irradiate an optical-axis center point of an intermediate transfer belt. The first PD is arranged at a position at which specularly reflected light of light emitted from the first LED and diffused reflected light of light emitted from the second LED are received. The second PD is arranged at a position at which diffused reflected light of the light emitted from the first LED is received.
    Type: Application
    Filed: August 6, 2019
    Publication date: February 20, 2020
    Inventor: Katsuhiro Ishido
  • Patent number: 10567621
    Abstract: An original image is read as an aggregate of a plurality of pixels in which adjacent pixels have different colors (R, G, and B) in a main scanning direction and in a sub-scanning direction, and the read pixels of the respective colors are stored in a line memory in association with information on relative positions of the pixels with respect to another pixel. Then, the stored pixels are sorted so that pixels having the same color are adjacent to each other, and an abnormal pixel (dust) not present in the original image is detected based on the state of the sorted pixels. With this, the dust not present in the original image is detected without increasing the cost, and the dust is corrected without forming a conspicuous trace of correction.
    Type: Grant
    Filed: November 27, 2018
    Date of Patent: February 18, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventors: Daisuke Akagi, Katsuhiro Ishido
  • Patent number: 10491770
    Abstract: Provided is an image reading apparatus capable of accurately detecting an inclination amount of an original image by recognizing an edge part of the original image with high precision even when dust, stain, or the like adheres to a background part. The image reading apparatus includes: an original reader configured to read an image of an original; and a volume resistor configured to represent an original width of the original by a resistance value. The image reading apparatus further includes: a skew feed amount detector configured to set a predetermined range including the edge part of the original in a width direction as an edge detection range based on the original width, to acquire an edge image being the edge part of the original from an image within the edge detection range.
    Type: Grant
    Filed: October 25, 2016
    Date of Patent: November 26, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventor: Katsuhiro Ishido
  • Patent number: 10334137
    Abstract: Provided is an image reading apparatus configured to recognize edge portions of an image of an original precisely without being influenced by the varying state of the four sides of the original. The image reading apparatus includes an image reading unit configured to read the original image by scanning the original, an edge determining unit configured to determine first edge locations at the left end and right end of the original image in a main scanning direction, an edge detector configured to detect a second edge location of the original image in a sub-scanning direction, a tilt expression calculator configured to calculate a linear expression that represents the amount of inclination of the original image with respect to the main scanning direction.
    Type: Grant
    Filed: October 25, 2016
    Date of Patent: June 25, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventors: Toshitaka Noro, Hirotaka Seki, Katsuhiro Ishido
  • Publication number: 20190141216
    Abstract: An original image is read as an aggregate of a plurality of pixels in which adjacent pixels have different colors (R, G, and B) in a main scanning direction and in a sub-scanning direction, and the read pixels of the respective colors are stored in a line memory in association with information on relative positions of the pixels with respect to another pixel. Then, the stored pixels are sorted so that pixels having the same color are adjacent to each other, and an abnormal pixel (dust) not present in the original image is detected based on the state of the sorted pixels. With this, the dust not present in the original image is detected without increasing the cost, and the dust is corrected without forming a conspicuous trace of correction.
    Type: Application
    Filed: November 27, 2018
    Publication date: May 9, 2019
    Inventors: Daisuke Akagi, Katsuhiro Ishido
  • Patent number: 10171708
    Abstract: An original image is read as an aggregate of a plurality of pixels in which adjacent pixels have different colors (R, G, and B) in a main scanning direction and in a sub-scanning direction, and the read pixels of the respective colors are stored in a line memory in association with information on relative positions of the pixels with respect to another pixel. Then, the stored pixels are sorted so that pixels having the same color are adjacent to each other, and an abnormal pixel (dust) not present in the original image is detected based on the state of the sorted pixels. With this, the dust not present in the original image is detected without increasing the cost, and the dust is corrected without forming a conspicuous trace of correction.
    Type: Grant
    Filed: May 8, 2017
    Date of Patent: January 1, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Daisuke Akagi, Katsuhiro Ishido
  • Patent number: 10044890
    Abstract: An image reading apparatus which is capable of successfully reading an image off an original by correctly detecting a size of the original without degrading productivity even if mixed-size originals are placed on an original tray with edges not aligned. An image reading unit reads an image off an original passing through a reading position. An original size detection sensor detects an original. A first original size is determined using a result of detection by the original size detection sensor, and a second original size is determined using the image read off the original. The first original size or the second original size is adopted as an original size.
    Type: Grant
    Filed: March 30, 2016
    Date of Patent: August 7, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Hayato Koyama, Katsuhiro Ishido, Daisuke Morikawa, Hirotaka Seki, Toshitaka Noro, Yuzuru Yano
  • Publication number: 20170331983
    Abstract: An image reading apparatus includes a front-side reader, which includes a white LED configured to irradiate an original with light and a CMOS sensor configured to receive light that is reflected by the original. The front-side reader is configured to generate read data that represents a luminance value of an image on the original from the result of receiving light with the CMOS sensor. The image reading apparatus stores, in a non-volatile memory, a condition for determining whether there is a sub-scanning color shift, and uses a sub-scanning color shift detector to determine whether there is a sub-scanning color shift based on the read data obtained from the front-side reader and the condition stored in the non-volatile memory. When there is a sub-scanning color shift, the image reading apparatus corrects the sub-scanning color shift by correcting the read data with a color shift corrector.
    Type: Application
    Filed: May 10, 2017
    Publication date: November 16, 2017
    Inventors: Katsuhiro Ishido, Daisuke Akagi
  • Publication number: 20170331984
    Abstract: An original image is read as an aggregate of a plurality of pixels in which adjacent pixels have different colors (R, G, and B) in a main scanning direction and in a sub-scanning direction, and the read pixels of the respective colors are stored in a line memory in association with information on relative positions of the pixels with respect to another pixel. Then, the stored pixels are sorted so that pixels having the same color are adjacent to each other, and an abnormal pixel (dust) not present in the original image is detected based on the state of the sorted pixels. With this, the dust not present in the original image is detected without increasing the cost, and the dust is corrected without forming a conspicuous trace of correction.
    Type: Application
    Filed: May 8, 2017
    Publication date: November 16, 2017
    Inventors: Daisuke Akagi, Katsuhiro Ishido
  • Publication number: 20170126929
    Abstract: Provided is an image reading apparatus configured to recognize edge portions of an image of an original precisely without being influenced by the varying state of the four sides of the original. The image reading apparatus includes an image reading unit configured to read the original image by scanning the original, an edge determining unit configured to determine first edge locations at the left end and right end of the original image in a main scanning direction, an edge detector configured to detect a second edge location of the original image in a sub-scanning direction, a tilt expression calculator configured to calculate a linear expression that represents the amount of inclination of the original image with respect to the main scanning direction.
    Type: Application
    Filed: October 25, 2016
    Publication date: May 4, 2017
    Inventors: Toshitaka Noro, Hirotaka Seki, Katsuhiro Ishido
  • Publication number: 20170126915
    Abstract: Provided is an image reading apparatus capable of accurately detecting an inclination amount of an original image by recognizing an edge part of the original image with high precision even when dust, stain, or the like adheres to a background part. The image reading apparatus includes: an original reader configured to read an image of an original; and a volume resistor configured to represent an original width of the original by a resistance value. The image reading apparatus further includes: a skew feed amount detector configured to set a predetermined range including the edge part of the original in a width direction as an edge detection range based on the original width, to acquire an edge image being the edge part of the original from an image within the edge detection range.
    Type: Application
    Filed: October 25, 2016
    Publication date: May 4, 2017
    Inventor: Katsuhiro Ishido
  • Publication number: 20160295046
    Abstract: An image reading apparatus which is capable of successfully reading an image off an original by correctly detecting a size of the original without degrading productivity even if mixed-size originals are placed on an original tray with edges not aligned. An image reading unit reads an image off an original passing through a reading position. An original size detection sensor detects an original. A first original size is determined using a result of detection by the original size detection sensor, and a second original size is determined using the image read off the original. The first original size or the second original size is adopted as an original size.
    Type: Application
    Filed: March 30, 2016
    Publication date: October 6, 2016
    Inventors: Hayato Koyama, Katsuhiro Ishido, Daisuke Morikawa, Hirotaka Seki, Toshitaka Noro, Yuzuru Yano
  • Patent number: 9386177
    Abstract: In the original reading apparatus configured to store the image data in the image storing unit such as temporary storage memory, time required to complete the overwriting for erasure is reduced. The image data read by the image reading unit is stored in the image data storing unit and the stored image data is output. To hold data stored in the image data storing unit, refresh processing, which is to perform processing intermittently required to hold the data stored in the image data storing unit, is performed at a predetermined execution frequency. After the image data is output, frequency to execute the refresh processing is reduced as compared to a predetermined execution frequency to perform writing of the dummy data.
    Type: Grant
    Filed: March 31, 2015
    Date of Patent: July 5, 2016
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Katsuhiro Ishido
  • Publication number: 20150296094
    Abstract: In the original reading apparatus configured to store the image data in the image storing unit such as temporary storage memory, time required to complete the overwriting for erasure is reduced. The image data read by the image reading unit is stored in the image data storing unit and the stored image data is output. To hold data stored in the image data storing unit, refresh processing, which is to perform processing intermittently required to hold the data stored in the image data storing unit, is performed at a predetermined execution frequency. After the image data is output, frequency to execute the refresh processing is reduced as compared to a predetermined execution frequency to perform writing of the dummy data.
    Type: Application
    Filed: March 31, 2015
    Publication date: October 15, 2015
    Inventor: Katsuhiro Ishido
  • Patent number: 8861047
    Abstract: A document size detector sets an amount of light to be emitted from a light source for document size detection in accordance with the amount of disturbance light detected by the CCD, switches on the light source so as to make the light source emit the set amount of light, and detects the size of a document placed on a platen. Therefore, erroneous detection of a document size is prevented and glare that a user is subjected to when the size of a document placed on the platen is detected is reduced.
    Type: Grant
    Filed: March 18, 2009
    Date of Patent: October 14, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventor: Katsuhiro Ishido
  • Patent number: 8705153
    Abstract: A plurality of line sensors corresponding to a plualrity of color components receive reflected light passed through an imaging unit and convert the light into a plurality of color component data. A correcting unit performs color misalignment correction based on a reference color component for which resolution performance is lowest among the plurality of color component, on the color component data corresponding to other color components.
    Type: Grant
    Filed: June 21, 2011
    Date of Patent: April 22, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventor: Katsuhiro Ishido
  • Patent number: 8610978
    Abstract: A document reading apparatus includes a white LED including an LED and a fluorescent material and configured to illuminate a document reading position with light, a reading unit having a color line sensor and a monochrome line sensor and configured to read an image of a document illuminated with the light emitted from the white LED, and a filter arranged on an optical path between the monochrome line sensor and the document, and wherein the filter is configured to suppress transmission of light at a peak wavelength of the LED so that, regarding an intensity of light to be received on the monochrome line sensor, the intensity of the light at the peak wavelength of the LED is smaller than the intensity of the light at the peak wavelength of the fluorescent material when the light emitted from the LED is received.
    Type: Grant
    Filed: January 28, 2010
    Date of Patent: December 17, 2013
    Assignee: Canon Kabushiki Kaisha
    Inventor: Katsuhiro Ishido
  • Patent number: 8270042
    Abstract: A document reading apparatus includes a document positioning plate configured to set a document to be read thereon, a light source configured to emit light onto an area where the document is set on the document positioning plate, an image sensor configured to photoelectrically convert reflected light of the light emitted from the light source to output color signals, and a document size detection unit configured to select a color signal used for document size detection from among the color signals output from the image sensor based on the color signals output from the image sensor in a state where the light source is turned off, and to detect a size of the document set on the document positioning plate based on the selected color signal output from the image sensor in a state where the light source is turned on.
    Type: Grant
    Filed: August 31, 2009
    Date of Patent: September 18, 2012
    Assignee: Canon Kabushiki Kaisha
    Inventor: Katsuhiro Ishido