Patents by Inventor Hiroki SHIRADO

Hiroki SHIRADO 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).

  • Patent number: 11277541
    Abstract: A signal correction device includes a correction signal generator configured to generate a correction signal serving to remove noise superimposed on an input signal; a phase adjuster configured to shift a phase of the correction signal generated by the correction signal generator; a subtractor configured to generate an output signal for output by subtracting the correction signal from the input signal; a peak and bottom detector configured to detect a peak value and a bottom value of the output signal; and a determiner configured to determine a phase-shift amount of the phase adjuster from the peak value and the bottom value of the output signal detected by the peak and bottom detector. The determiner detects uncorrected noise from the peak value and the bottom value of the output signal from the subtractor, and sets the phase-shift amount such that the uncorrected noise is reduced to a minimum.
    Type: Grant
    Filed: September 29, 2020
    Date of Patent: March 15, 2022
    Assignee: RICOH COMPANY, LTD.
    Inventors: Tatsuya Ozaki, Hiroki Shirado
  • Patent number: 11115561
    Abstract: An inclination detecting device includes processing circuitry. The processing circuitry is configured to detect, in image information that is an image of an object imaged by an imaging device at an imaging position where a background member forms a background, a first boundary between the background member and a shadow of the object; detect a second boundary between the object and the shadow of the object in the image information; and detect an inclination of the object in the image information from the first boundary and the second boundary detected by the processing circuitry.
    Type: Grant
    Filed: January 29, 2020
    Date of Patent: September 7, 2021
    Assignee: RICOH COMPANY, LTD.
    Inventors: Hajime Tsukahara, Hiroki Shirado, Ayumu Hashimoto, Yuuki Nakada, Tomohiko Ono, Tatsuya Ozaki, Hiroshi Kubo, Yoshiaki Nagao, Kimiharu Yanagisawa, Masahiro Itoh
  • Patent number: 11102375
    Abstract: A sheet reading apparatus includes a sheet table on which a sheet is placed, a conveyor configured to convey the sheet, a reading guide configured to guide the sheet conveyed by the conveyor, and a reading device configured to read a shadow of the sheet conveyed by the conveyor, for detection of an inclination of the sheet. The sheet reading apparatus further includes a transparent member disposed at a position on a reading line of the reading device. The position on the reading line is withdrawn from the sheet and adjacent to the reading guide.
    Type: Grant
    Filed: October 16, 2019
    Date of Patent: August 24, 2021
    Assignee: RICOH COMPANY, LTD.
    Inventors: Hiroshi Kubo, Kimiharu Yanagisawa, Hajime Tsukahara, Yoshiaki Nagao, Masahiro Itoh, Tatsuya Ozaki, Tomohiko Ono, Yuuki Nakada, Hiroki Shirado, Ayumu Hashimoto
  • Patent number: 11102364
    Abstract: An inclination detecting device includes processing circuitry. The processing circuitry is configured to detect, in image information that is an image of an object imaged by an imaging device at an imaging position where a background member forms a background, a first boundary between the background member and a shadow of the object at detection positions in at least one of main-scanning and sub-scanning directions on an outline of the object; detect a second boundary between the object and the shadow of the object at detection positions in at least one of the main-scanning and sub-scanning directions on the outline of the object in the image information; detect a boundary group including detection results of the second boundary at the detection positions; and detect an inclination of the object in the image information from detection results of the first boundary, the second boundary, and the boundary group.
    Type: Grant
    Filed: January 30, 2020
    Date of Patent: August 24, 2021
    Assignee: RICOH COMPANY, LTD.
    Inventors: Yuuki Nakada, Hajime Tsukahara, Hiroki Shirado, Ayumu Hashimoto, Tomohiko Ono, Tatsuya Ozaki, Hiroshi Kubo, Yoshiaki Nagao, Kimiharu Yanagisawa, Masahiro Itoh
  • Patent number: 11102365
    Abstract: An edge detecting device includes processing circuitry. The processing circuitry is configured to acquire first color information and second color information in an image including a document region and a background region outside the document region. The first color information is color information of the background region and the second color information is color information of the document region. The processing circuitry is configured to detect a boundary between the background region and the document region from a change in color information between the first color information and the second color information.
    Type: Grant
    Filed: April 7, 2020
    Date of Patent: August 24, 2021
    Assignee: RICOH COMPANY, LTD.
    Inventors: Tomohiko Ono, Hajime Tsukahara, Hiroki Shirado, Ayumu Hashimoto, Yuuki Nakada, Tatsuya Ozaki, Hiroshi Kubo, Yoshiaki Nagao, Kimiharu Yanagisawa, Masahiro Itoh
  • Patent number: 11095788
    Abstract: A document size detection device includes: a light source that irradiates a document placed on placing means with scanning light via the placing means; a reading unit that receives reflection light from the document via the placing means to acquire image data of the document; and circuitry to set an illumination depth of the scanning light at a size detection time when the size is detected, shallower than an illumination depth of the scanning light at an image reading time when an image of the document is read, and detects, at the size detection time, the size based on a difference between first image data acquired in a state in which the scanning light is switched off and second image data acquired in a state in which the scanning light is switched on.
    Type: Grant
    Filed: October 1, 2019
    Date of Patent: August 17, 2021
    Assignee: Ricoh Company, Ltd.
    Inventors: Tadaaki Oyama, Masamoto Nakazawa, Hiroki Shirado, Tomohiro Sasa, Tatsuya Ozaki, Kohsuke Nambara
  • Patent number: 11089177
    Abstract: A reading device includes: a light source that irradiates a subject with scanning light; a light receiving section that receives reflection light from the subject; and circuitry to: control the light source to switch on and off of the scanning light; control the light receiver to receive the reflection light from the subject for a predetermined acquisition time at a predetermined acquisition interval so as to acquire data; and calculate a difference between the data acquired while the scanning light is switched on and the data acquired while the scanning light is switched off. The predetermined acquisition time and the predetermined acquisition interval are set such that the acquisition time or a total time of the acquisition time and the acquisition interval become an integer multiple of a fluctuation cycle of a fluctuation factor.
    Type: Grant
    Filed: October 1, 2019
    Date of Patent: August 10, 2021
    Assignee: Ricoh Company, Ltd.
    Inventors: Tatsuya Ozaki, Tadaaki Oyama, Tomohiro Sasa, Hiroki Shirado, Kohsuke Nambara, Masamoto Nakazawa
  • Publication number: 20210099614
    Abstract: A signal correction device includes a correction signal generator configured to generate a correction signal serving to remove noise superimposed on an input signal; a phase adjuster configured to shift a phase of the correction signal generated by the correction signal generator; a subtractor configured to generate an output signal for output by subtracting the correction signal from the input signal; a peak and bottom detector configured to detect a peak value and a bottom value of the output signal; and a determiner configured to determine a phase-shift amount of the phase adjuster from the peak value and the bottom value of the output signal detected by the peak and bottom detector. The determiner detects uncorrected noise from the peak value and the bottom value of the output signal from the subtractor, and sets the phase-shift amount such that the uncorrected noise is reduced to a minimum.
    Type: Application
    Filed: September 29, 2020
    Publication date: April 1, 2021
    Inventors: Tatsuya OZAKI, Hiroki SHIRADO
  • Patent number: 10951791
    Abstract: An image processing apparatus includes circuitry to: obtain a read image read from an image of a document output from an image reading device; detect an edge between a background area and a document area in the read image; sample a detection result of the edge at each first interval in a first direction to extract a first boundary point group including a plurality of boundary points; sample the detection result of the edge at each second interval in the first direction to extract a second boundary point group including a plurality of boundary points; determine a noise removal condition based on the first boundary point group; remove, from the second boundary point group, a boundary point satisfying the noise removal condition as noise; and calculate a linear equation approximating the second boundary point group from which the noise is removed.
    Type: Grant
    Filed: February 25, 2020
    Date of Patent: March 16, 2021
    Assignee: Ricoh Company, Ltd.
    Inventors: Ayumu Hashimoto, Hajime Tsukahara, Hiroki Shirado, Yuuki Nakada, Tomohiko Ono, Tatsuya Ozaki, Hiroshi Kubo, Kimiharu Yanagisawa, Yoshiaki Nagao, Masahiro Itoh
  • Patent number: 10855866
    Abstract: A document size detection device includes: a light source to irradiate a document with light; an imaging device to receive light reflected at the document; and circuitry to control switch on and off of the light source and movement in a sub-scanning direction of the light source, and determine a size of the document based on image data acquired by the imaging device. The circuitry is to determine a size in a main-scanning direction of the document based on: first image data acquired when the light source is switched off while the light source is at a first reading position; second image data acquired when the light source is switched on while the light source is at the first reading position; and third image data acquired when the light source is switched on while the light source is being moved from the first reading position to a second reading position.
    Type: Grant
    Filed: September 19, 2019
    Date of Patent: December 1, 2020
    Assignee: Ricoh Company, Ltd.
    Inventors: Tomohiro Sasa, Hiroki Shirado, Tadaaki Oyama, Tatsuya Ozaki, Kohsuke Nambara
  • Publication number: 20200336615
    Abstract: An edge detecting device includes processing circuitry. The processing circuitry is configured to acquire first color information and second color information in an image including a document region and a background region outside the document region. The first color information is color information of the background region and the second color information is color information of the document region. The processing circuitry is configured to detect a boundary between the background region and the document region from a change in color information between the first color information and the second color information.
    Type: Application
    Filed: April 7, 2020
    Publication date: October 22, 2020
    Inventors: Tomohiko ONO, Hajime TSUKAHARA, Hiroki SHIRADO, Ayumu HASHIMOTO, Yuuki NAKADA, Tatsuya OZAKI, Hiroshi KUBO, Yoshiaki NAGAO, Kimiharu YANAGISAWA, Masahiro ITOH
  • Publication number: 20200296255
    Abstract: An image processing apparatus includes circuitry to: obtain a read image read from an image of a document output from an image reading device; detect an edge between a background area and a document area in the read image; sample a detection result of the edge at each first interval in a first direction to extract a first boundary point group including a plurality of boundary points; sample the detection result of the edge at each second interval in the first direction to extract a second boundary point group including a plurality of boundary points; determine a noise removal condition based on the first boundary point group; remove, from the second boundary point group, a boundary point satisfying the noise removal condition as noise; and calculate a linear equation approximating the second boundary point group from which the noise is removed.
    Type: Application
    Filed: February 25, 2020
    Publication date: September 17, 2020
    Applicant: Ricoh Company, Ltd.
    Inventors: AYUMU HASHIMOTO, HAJIME TSUKAHARA, HIROKI SHIRADO, YUUKI NAKADA, TOMOHIKO ONO, TATSUYA OZAKI, HIROSHI KUBO, KIMIHARU YANAGISAWA, YOSHIAKI NAGAO, MASAHIRO ITOH
  • Publication number: 20200252513
    Abstract: An inclination detecting device includes processing circuitry. The processing circuitry is configured to detect, in image information that is an image of an object imaged by an imaging device at an imaging position where a background member forms a background, a first boundary between the background member and a shadow of the object at detection positions in at least one of main-scanning and sub-scanning directions on an outline of the object; detect a second boundary between the object and the shadow of the object at detection positions in at least one of the main-scanning and sub-scanning directions on the outline of the object in the image information; detect a boundary group including detection results of the second boundary at the detection positions; and detect an inclination of the object in the image information from detection results of the first boundary, the second boundary, and the boundary group.
    Type: Application
    Filed: January 30, 2020
    Publication date: August 6, 2020
    Inventors: Yuuki NAKADA, Hajime TSUKAHARA, Hiroki SHIRADO, Ayumu HASHIMOTO, Tomohiko ONO, Tatsuya OZAKI, Hiroshi KUBO, Yoshiaki NAGAO, Kimiharu YANAGISAWA, Masahiro ITOH
  • Publication number: 20200244837
    Abstract: An inclination detecting device includes processing circuitry. The processing circuitry is configured to detect, in image information that is an image of an object imaged by an imaging device at an imaging position where a background member forms a background, a first boundary between the background member and a shadow of the object; detect a second boundary between the object and the shadow of the object in the image information; and detect an inclination of the object in the image information from the first boundary and the second boundary detected by the processing circuitry.
    Type: Application
    Filed: January 29, 2020
    Publication date: July 30, 2020
    Inventors: Hajime TSUKAHARA, Hiroki SHIRADO, Ayumu HASHIMOTO, Yuuki NAKADA, Tomohiko ONO, Tatsuya OZAKI, Hiroshi KUBO, Yoshiaki NAGAO, Kimiharu YANAGISAWA, Masahiro ITOH
  • Publication number: 20200137262
    Abstract: A sheet reading apparatus includes a sheet table on which a sheet is placed, a conveyor configured to convey the sheet, a reading guide configured to guide the sheet conveyed by the conveyor, and a reading device configured to read a shadow of the sheet conveyed by the conveyor, for detection of an inclination of the sheet. The sheet reading apparatus further includes a transparent member disposed at a position on a reading line of the reading device. The position on the reading line is withdrawn from the sheet and adjacent to the reading guide.
    Type: Application
    Filed: October 16, 2019
    Publication date: April 30, 2020
    Inventors: Hiroshi KUBO, Kimiharu YANAGISAWA, Hajime TSUKAHARA, Yoshiaki NAGAO, Masahiro ITOH, Tatsuya OZAKI, Tomohiko ONO, Yuuki NAKADA, Hiroki SHIRADO, Ayumu HASHIMOTO
  • Publication number: 20200120228
    Abstract: A reading device includes: a light source that irradiates a subject with scanning light; a light receiving section that receives reflection light from the subject; and circuitry to: control the light source to switch on and off of the scanning light; control the light receiver to receive the reflection light from the subject for a predetermined acquisition time at a predetermined acquisition interval so as to acquire data; and calculate a difference between the data acquired while the scanning light is switched on and the data acquired while the scanning light is switched off. The predetermined acquisition time and the predetermined acquisition interval are set such that the acquisition time or a total time of the acquisition time and the acquisition interval become an integer multiple of a fluctuation cycle of a fluctuation factor.
    Type: Application
    Filed: October 1, 2019
    Publication date: April 16, 2020
    Inventors: Tatsuya OZAKI, Tadaaki OYAMA, Tomohiro SASA, Hiroki SHIRADO, Kohsuke NAMBARA, Masamoto NAKAZAWA
  • Publication number: 20200120225
    Abstract: A document size detection device includes: a light source that irradiates a document placed on placing means with scanning light via the placing means; a reading unit that receives reflection light from the document via the placing means to acquire image data of the document; and circuitry to set an illumination depth of the scanning light at a size detection time when the size is detected, shallower than an illumination depth of the scanning light at an image reading time when an image of the document is read, and detects, at the size detection time, the size based on a difference between first image data acquired in a state in which the scanning light is switched off and second image data acquired in a state in which the scanning light is switched on.
    Type: Application
    Filed: October 1, 2019
    Publication date: April 16, 2020
    Inventors: Tadaaki OYAMA, Masamoto Nakazawa, Hiroki Shirado, Tomohiro Sasa, Tatsuya Ozaki, Kohsuke Nambara
  • Publication number: 20200120224
    Abstract: A document size detection device includes: a light source to irradiate a document with light; an imaging device to receive light reflected at the document; and circuitry to control switch on and off of the light source and movement in a sub-scanning direction of the light source, and determine a size of the document based on image data acquired by the imaging device. The circuitry is to determine a size in a main-scanning direction of the document based on: first image data acquired when the light source is switched off while the light source is at a first reading position; second image data acquired when the light source is switched on while the light source is at the first reading position; and third image data acquired when the light source is switched on while the light source is being moved from the first reading position to a second reading position.
    Type: Application
    Filed: September 19, 2019
    Publication date: April 16, 2020
    Inventors: Tomohiro Sasa, Hiroki Shirado, Tadaaki Oyama, Tatsuya Ozaki, Kohsuke Nambara
  • Patent number: 10542184
    Abstract: A photoelectric conversion device includes a photoelectric conversion element to generate an image signal according to an intensity of light being input and circuitry. The circuitry obtains pixel values in dark time, respectively, for at least a first time and a second time. The second time is longer than the first time. The pixel values in dark time represent pixel values obtained when no light is input to the photoelectric conversion element. The circuitry obtains a subtraction between the pixel values for the first time and the pixel values for the second time. The circuitry detects a noise amount based on the subtraction. The circuitry determines at least one pixel having the detected noise amount that is equal to or greater than a predetermined first threshold value, as a defective pixel of the photoelectric conversion element.
    Type: Grant
    Filed: January 24, 2018
    Date of Patent: January 21, 2020
    Assignee: Ricoh Company, Ltd.
    Inventors: Takuhei Yokoyama, Hiroki Shirado, Masamoto Nakazawa
  • Patent number: 10536655
    Abstract: A photoelectric conversion device having plural photoelectric conversion pixels includes an imaging unit, a position identifying unit, an interpolation determining unit, and an interpolation processing unit. The imaging unit generates image data for each of plural colors based on light received in the photoelectric conversion pixels. The position identifying unit detects in the photoelectric conversion pixels a defective pixel outputting an electrical signal at an abnormal level, and stores position information of the defective pixel. The interpolation deter mining unit determines, based on respective pixel values of peripheral pixels peripheral to the defective pixel, whether to perform an interpolation process on the defective pixel. The interpolation processing unit performs the interpolation process on the defective pixel when the interpolation determining unit determines to perform the interpolation process on the defective pixel.
    Type: Grant
    Filed: October 23, 2017
    Date of Patent: January 14, 2020
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiroki Shirado, Masamoto Nakazawa, Masayuki Yabuuchi