Shade Correction Patents (Class 358/461)
  • Patent number: 11153453
    Abstract: An image reading device includes a background member, an illumination unit opposed to the background member, and a reader. The illumination unit emits light to a recording medium having an image thereon. The reader receives a reflection from the recording medium to read the image. The background member has a facing surface that faces the recording medium. The facing surface includes a reference portion on a center portion in a width direction of the background member. The reference portion has a higher reflectance than an end portion of the facing surface in the width direction.
    Type: Grant
    Filed: October 29, 2020
    Date of Patent: October 19, 2021
    Assignee: Ricoh Company, Ltd.
    Inventors: Satoshi Nakayama, Susumu Mikajiri, Hideyo Makino, Yoshinari Onuma, Kimiharu Yamazaki, Kohta Aoyagi
  • Patent number: 11146734
    Abstract: An image-capturing apparatus comprises an image sensor, a driver configured to incline at least one of the image sensor and an image-capturing optical system with respect to a plane perpendicular to an optical axis of the image-capturing optical system, and a corrector configured to perform shading correction on an image-capturing signal based on an inclination angle of the at least one of the image sensor and the image-capturing optical system with respect to the plane.
    Type: Grant
    Filed: August 29, 2019
    Date of Patent: October 12, 2021
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Tomoya Onaka
  • Patent number: 11107386
    Abstract: A LED controller includes an image buffer to hold image data. An LED pixel forming a part of a large pixel array is activatable in response to image data, LDO state, and pulse width modulation module state. A logic module including a pixel diagnostic mode using an LDO bypass is connected to modify LDO state and allow direct addressing of the LED pixel for diagnostic purposes without needing to use image data from the image buffer.
    Type: Grant
    Filed: June 28, 2019
    Date of Patent: August 31, 2021
    Assignee: Lumileds LLC
    Inventor: Ronald Bonne
  • Patent number: 10999461
    Abstract: An image reading apparatus includes an original stacking portion, an original feeding portion, an image reading portion, a shading operation portion, and a receiving portion. The shading operation portion acquires a shading correction value by causing the image reading portion to read a white reference member with a predetermined reading resolution when an original is stacked on the original stacking portion. When a resolution change instruction is received before reading of the original is started, depending on the resolution change instruction, the shading operation portion acquires a shading correction value by causing again the image reading portion to read the white reference member with a changed reading resolution.
    Type: Grant
    Filed: October 15, 2020
    Date of Patent: May 4, 2021
    Assignee: Canon Kabushiki Kaisha
    Inventor: Satoshi Totsuka
  • Patent number: 10944876
    Abstract: An image processing apparatus includes an operation unit having a display device, and includes a sensor to detect an abnormality of the operation unit. Where the sensor detects an operation unit abnormality, display data is generated for performing display including an error notification regarding the detected abnormality. The generated display data is provided to at least one of the display device and an information processing apparatus. In a case where (i) first data for performing display includes the error notification, includes an instruction portion to receive an instruction to continuously use the image processing apparatus, and is provided as provided display data, and (ii) an instruction to continuously use the image processing apparatus is received via the instruction portion, screen data is provided, in place of the generated display data, the provided display data for displaying a screen for using an the image processing apparatus function.
    Type: Grant
    Filed: January 9, 2020
    Date of Patent: March 9, 2021
    Assignee: Canon Kabushiki Kaisha
    Inventor: Masahito Yamazaki
  • Patent number: 10891464
    Abstract: An imaging apparatus 1 includes an image acquisition unit 51 and an image processing unit 53. The image acquisition unit 51 acquires a face image. The image processing unit 53 acquires a face image which has been acquired by the acquisition unit 51 and has been adjusted by at least one type of adjustment and synthesizes a plurality of face images including the adjusted face image, using map data in which a predetermined region of a face has been set as a transparent region on the basis of a three-dimensional shape of the face.
    Type: Grant
    Filed: October 5, 2018
    Date of Patent: January 12, 2021
    Assignee: CASIO COMPUTER CO., LTD.
    Inventor: Takeshi Sato
  • Patent number: 10819879
    Abstract: An image reading device includes a document conveying device, a first reading module and a control portion. When initial white reference data, that is, an initial value of white reference data, is acquired, the control portion performs white reference data acquisition processing in a plurality of reading modes sequentially, and if it is judged that the white reference data meets a predetermined condition through data judging processing in all the plurality of reading modes, the acquired initial white reference data is set as usable, and if it is judged that the white reference data does not meet the predetermined condition through data judging processing in at least one of the plurality of reading modes, the acquired initial white reference data is set as unusable.
    Type: Grant
    Filed: November 28, 2018
    Date of Patent: October 27, 2020
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Yasuyuki Horiguchi
  • Patent number: 10791236
    Abstract: An image forming apparatus includes an image forming unit, a temperature input unit, and an image processing unit. The image forming unit forms an image on a recording sheet. The temperature input unit receives an input of an environmental temperature. The image processing unit performs a preliminarily set process on the image based on the input environmental temperature. The process changes in accordance with the environmental temperature.
    Type: Grant
    Filed: April 25, 2019
    Date of Patent: September 29, 2020
    Assignee: Kyocera Document Solutions Inc.
    Inventor: Yusuke Kato
  • Patent number: 10776906
    Abstract: A radiographic image processing device includes a hardware processor which sets a reference signal value in a range of a signal value of a pixel in a processing object region in a radiographic image, determines a conversion rate to convert a dynamic range in a high signal region and a conversion rate to convert a dynamic range in a low signal region respectively based on the reference signal value, determines a contrast modification rate which indicates an extent of processing of contrast modification in the signal region where the dynamic range is converted in the processing object region based on the reference signal value or the conversion rate, converts a dynamic range of a signal region in the processing object region based on the determined conversion rate, and performs contrast modification in the signal region in the processing object region based on the determined contrast modification rate.
    Type: Grant
    Filed: August 8, 2018
    Date of Patent: September 15, 2020
    Assignee: KONICA MINOLTA, INC.
    Inventors: Ryohei Ito, Tatsuya Takagi
  • Patent number: 10721372
    Abstract: An image reading apparatus that controls relative positions of a carriage and a document in a first direction using a motor, so as to read an image of the document on a line by line basis, the carriage being mounted with an image sensor and a light source. The image reading apparatus detects an amount of movement caused by the motor in the first direction and generates a first trigger signal in response to input of a synchronization signal generated in accordance with the detected amount of movement, the first trigger signal instructing to start accumulation of charge in the image sensor, and, after a predetermined amount of time since the synchronization signal used for generating the first trigger signal is input, generates a second trigger signal, the second trigger signal instructing to end accumulation of the charge being accumulated in the image sensor.
    Type: Grant
    Filed: September 28, 2018
    Date of Patent: July 21, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventor: Yuichi Yanagiwara
  • Patent number: 10681246
    Abstract: An image reading apparatus includes: a light source; a reference sheet that reflects light emitted from the light source; a light-receiving lens that converges the reflected light; a reading sensor that reads the light converged by the light-receiving lens; and a hardware processor that: based on first white data obtained when the reading sensor reads the reference sheet for the first time, determines whether the reference sheet or the reading sensor has dust; in response to determining that the reference sheet or the reading sensor has dust, produces ideal initial white reference data by complementing the first white data with second white data obtained when the reading sensor reads the reference sheet for the second and subsequent times; and with the ideal initial white reference data, complements third white data obtained when the reading sensor reads the reference sheet right before reading an image of a job.
    Type: Grant
    Filed: July 31, 2019
    Date of Patent: June 9, 2020
    Assignee: Konica Minolta, Inc.
    Inventors: Tomohiro Ozawa, Tomohiro Yamaguchi
  • Patent number: 10681235
    Abstract: An image recording device includes a recorder, a reader and a hardware processor. The recorder records an image on a recording medium. The reader reads, with an imaging element, a surface of the recording medium and a surface of a predetermined reference member. The hardware processor calibrates the reader for a value to be detected by the imaging element, based on a reading result of the reading of the surface of the reference member. Further, the hardware processor performs the calibration in at least one of: a case where a type of the image to be recorded on the recording medium satisfies a predetermined image type condition; and a case where a predetermined reading influence factor which affects a reading result of the reading of the surface of the recording medium satisfies a predetermined reading influence factor condition.
    Type: Grant
    Filed: March 3, 2017
    Date of Patent: June 9, 2020
    Assignee: KONICA MINOLTA, INC.
    Inventors: Masakazu Date, Yutaka Hosono, Toshiyuki Mizutani
  • Patent number: 10574860
    Abstract: An image scanner includes: a document table; a document cover; a light source; an image sensor; and a circuit configured to: acquire, as pre-reading black data, the line data that is generated by the image sensor in a state where the light source is turned off; after acquiring the pre-reading black data, acquire, as line image data, the line data that is generated by the image sensor in a state where light is emitted from the light source to an original document supported on the document table; after acquiring the line image data, acquire, as post-reading black data, the line data that is generated by the image sensor in a state where the light source is turned off; determine black reference data based on the post-reading black data and the pre-reading black data; and perform black correction on the line image data based on the black reference data.
    Type: Grant
    Filed: February 20, 2019
    Date of Patent: February 25, 2020
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventor: Hidekazu Okada
  • Patent number: 10560594
    Abstract: An image scanning apparatus includes a controller configured to perform a light quantity adjustment determining process to determine whether a detection light quantity needs to be adjusted, based on adjustment determination values, in a black-white detectable position, a light quantity adjusting process to adjust the detection light quantity to maximize an adjustment difference value between a gradation value generated by scanning a white portion of a reference member and a gradation value generated by scanning a black portion of the reference member, a threshold calculating process to calculate a detection threshold based on a black value and a white value, and a reference position detecting process to detect a reference position by comparing, with the detection threshold, gradation values generated by scanning the reference member while illuminating the reference member with the detection light quantity.
    Type: Grant
    Filed: August 15, 2019
    Date of Patent: February 11, 2020
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventor: Jie Zheng
  • Patent number: 10554847
    Abstract: An image reading apparatus includes: a reading unit configured to read an image of an original and output an image signal; and a white reference plate to be used for shading correction. The image reading apparatus drives the reading unit with maximum power consumption for a predetermined time period and thereafter drives the reading unit with reduced power consumption. The image reading apparatus causes the reading unit with reduced power consumption to read the white reference plate and generates shading data to be used for the shading correction. After that, the image reading apparatus causes the reading unit to read an original and corrects a reading result of the original based on the shading data.
    Type: Grant
    Filed: February 22, 2019
    Date of Patent: February 4, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventor: Daisuke Akagi
  • Patent number: 10542166
    Abstract: An image reading apparatus including a controller configured to perform an update processing for updating shading correction data stored in a memory by a generation processing of generating shading correction data based on an image signal of a reference member and perform a size determination processing for determining a size of a document based on an image signal of the document, wherein, when the document on the document platen is read, the controller performs the generation processing before the document is read, and an image processing portion performs the shading correction using the shading correction data generated before the document is read, and wherein, when the size determination processing is performed, the image processing portion performs the shading correction using the shading correction data stored in the memory, and the update processing is not performed.
    Type: Grant
    Filed: May 1, 2018
    Date of Patent: January 21, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventors: Satoshi Seki, Akiko Kanno
  • Patent number: 10517555
    Abstract: A multiple frame x-ray imaging system is disclosed with capability of differential x-ray exposure of different input areas of an image intensifier or other x-ray detector. Collimators are provided to control the amount of radiation in various regions of the image and image processing is provided to provide the display of images of different qualities.
    Type: Grant
    Filed: November 20, 2017
    Date of Patent: December 31, 2019
    Assignee: Controlrad Systems Inc.
    Inventors: Haim Zvi Melman, Allon Guez
  • Patent number: 10506107
    Abstract: A device and method for use with an image recording device. The device having a background target and a first surface including the background target recessed therein. The device further including a substrate stabilizer configured to move a substrate having an image printed therein in closer proximity to the background target and below the first surface when activated.
    Type: Grant
    Filed: April 25, 2016
    Date of Patent: December 10, 2019
    Assignee: QuadTech, Inc.
    Inventors: Steve J. Lachajewski, Stephen J. Daily
  • Patent number: 10477051
    Abstract: Provided is a reading kit including a reading unit configured to read an image of an original being conveyed in a predetermined direction at a predetermined reading position, and a white reference sheet comprising a white reference portion to be read by the reading unit and an engaged portion to be engaged with a positioning member. The white reference portion being arranged at the predetermined reading position by engaging the engaged portion with the positioning member.
    Type: Grant
    Filed: September 28, 2017
    Date of Patent: November 12, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventor: Tomofumi Sakuma
  • Patent number: 10469176
    Abstract: The present invention is directed to communication systems and methods. In a specific embodiment, the present invention provides an optical receiver that receives a data stream from an optical transmitter. The optical receiver determines a histogram contour parameter using the data stream and inserts the histogram contour parameter into a back-channel data segment, which is then transmitted to the optical transmitter. The optical transmitter changes its data transmission setting based on the histogram contour parameter. There are other embodiments as well.
    Type: Grant
    Filed: July 7, 2017
    Date of Patent: November 5, 2019
    Assignee: INPHI CORPORATION
    Inventors: Todd Rope, Hari Shankar, Radhakrishnan L. Nagarajan
  • Patent number: 10458924
    Abstract: A defect inspection apparatus includes a light irradiation unit irradiating a sample placed on a table unit with illumination light, a detection optical system forming a scattered light image from the sample and detecting the generated scattered light image through an image sensor, a processing unit receiving a signal from the image sensor of the detection optical system that detects the scattered light image, generating an image of the scattered light, and detecting a defect of the sample by processing the generated image, an output unit outputting the defect image processed by the image processing unit, and a control unit controlling the stable unit, the light irradiation unit, the detection optical system, and the image processing unit. The image processing unit includes an image generation unit that receives the signal and generates the image, a correction unit that corrects lightness discontinuity and a defect detection unit for image processing.
    Type: Grant
    Filed: July 4, 2016
    Date of Patent: October 29, 2019
    Assignee: Hitachi High-Technologies Corporation
    Inventors: Hisaaki Kanai, Masami Makuuchi, Yukihisa Mohara, Eiji Imai
  • Patent number: 10452922
    Abstract: An image enhancement method for video analysis or automatic video surveillance systems has at least one image acquisition device, through which an IR thermal spectrum image is captured from an area of space, a scene calibration system and a detection system, through which at least one object type is detected. The method includes at least one processing stage in which the contrast of the captured image is enhanced by the image acquisition device through the image's depth or scene information obtained directly or indirectly by the scene calibration system or entered manually by the user.
    Type: Grant
    Filed: June 13, 2016
    Date of Patent: October 22, 2019
    Assignee: DAVANTIS TECHNOLOGIES SL
    Inventors: Nicolas Herrero Molina, Marti Balcells Capellades, Jordi Lluis Barba
  • Patent number: 10447890
    Abstract: Provided is an image reading apparatus for suppressing an image defect ascribable to shading correction using a white reference plate arranged at a position different from a reading position of an original. The image reading apparatus includes a reading unit configured to read an image from the original passing through the reading position, the white reference plate arranged such that a distance between the reading unit and the white reference plate is larger than the distance between the reading unit and the reading position, and a control system. The control system includes a memory for backup configured to store in advance correlation data representing a correlation between a reading result of the white reference plate obtained by the reading unit, and a reading result of a reference member having a uniform density and arranged at the reading position.
    Type: Grant
    Filed: September 7, 2017
    Date of Patent: October 15, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Ryo Mikami, Yushi Oka, Masato Furukawa, Kaoru Hamada, Shinichi Ikoma
  • Patent number: 10438357
    Abstract: An interactive image segmenting apparatus and method are provided. The image segmenting apparatus and corresponding method include a boundary detector, a condition generator, and a boundary modifier. The boundary detector is configured to detect a boundary from an image using an image segmentation process. The feedback receiver is configured to receive information about the detected boundary. The condition generator is configured to generate a constraint for the image segmentation process based on the information. The boundary modifier is configured to modify the detected boundary by applying the generated constraint to the image segmentation process.
    Type: Grant
    Filed: December 15, 2015
    Date of Patent: October 8, 2019
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Won Sik Kim
  • Patent number: 10389903
    Abstract: An image scanning apparatus includes a controller configured to perform a light quantity adjustment determining process to determine whether a detection light quantity needs to be adjusted, based on adjustment determination values, in a black-white detectable position, a light quantity adjusting process to adjust the detection light quantity to maximize an adjustment difference value between a gradation value generated by scanning a white portion of a reference member and a gradation value generated by scanning a black portion of the reference member, a threshold calculating process to calculate a detection threshold based on a black value and a white value, and a reference position detecting process to detect a reference position by comparing, with the detection threshold, gradation values generated by scanning the reference member while illuminating the reference member with the detection light quantity.
    Type: Grant
    Filed: March 2, 2018
    Date of Patent: August 20, 2019
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventor: Jie Zheng
  • Patent number: 10372981
    Abstract: Determining if a document is a text page includes partitioning the document into a plurality of cells, scaling each of the cells to a standardized number of pixels to provide a corresponding snippet for each of the cells, using a classifier to examine the snippets to determine which of the cells are classified as text and which of the cells are not classified as text, determining a volume of text for the document based on a total amount of text in the document corresponding to a sum of an amount of text in each of the cells classified as text, and determining that the document is a text page in response to the total amount exceeding a pre-determined threshold. In response to the total amount being less than the pre-determined threshold, cells not classified as text may be examined further. The classifier may be provided by training a neural net.
    Type: Grant
    Filed: September 22, 2016
    Date of Patent: August 6, 2019
    Assignee: EVERNOTE CORPORATION
    Inventors: Alexander Pashintsev, Boris Gorbatov, Eugene Livshitz, Vitaly Glazkov
  • Patent number: 10367971
    Abstract: A crease detecting unit 13 detects a crease in a document image. A toner peeling detecting unit (a) detects as a toner peeling part a pixel area on the crease, the pixel area (a1) having a width of the predetermined number of pixels in a direction perpendicular to the crease, (a2) having a background color, and (a3) of which both sides are adjacent to at least two pixels in a direction perpendicular to the crease, the at least two pixels having a color other than the back ground color, and (b) corrects a pixel value of the toner peeling part on the basis of pixel values of at least two pixels adjacent to both sides of the pixel area.
    Type: Grant
    Filed: July 15, 2016
    Date of Patent: July 30, 2019
    Assignee: Kyocera Document Solutions, Inc.
    Inventor: Kazuhiro Kanamaru
  • Patent number: 10362189
    Abstract: An image reading apparatus includes a moving unit, a first detecting unit, and a second detecting unit. The moving unit moves a calibration plate in the main scanning direction relatively to a reading apparatus. The calibration plate is a plate for calibrating the reading apparatus. The reading apparatus has a reading unit and reading glass. The reading unit is arranged in the main scanning direction. The reading glass is disposed on a reading surface side of the reading unit. The first detecting unit detects an abnormality on the calibration plate from reading results. The reading results are obtained in such a manner that, while the moving unit is controlled to move the calibration plate, the reading unit reads the calibration plate. The second detecting unit detects an abnormality on the reading glass from the reading results.
    Type: Grant
    Filed: October 28, 2016
    Date of Patent: July 23, 2019
    Assignee: FUJI XEROX CO., LTD.
    Inventor: Masaki Fujise
  • Patent number: 10277846
    Abstract: A photoelectric conversion element comprises: a plurality of pixels, each of which performs photoelectric conversion and outputs an analog signal; an analog processing unit that sequentially processes, on a pixel-to-pixel basis, the analog signals output from a pixel group including the pixels; and a signal supply unit that supplies a signal needed for preliminary operation to the analog processing unit so as to enable the analog processing unit to perform the preliminary operation before the analog processing unit starts to process the analog signals output from the pixel group.
    Type: Grant
    Filed: June 22, 2015
    Date of Patent: April 30, 2019
    Assignee: RICOH COMPANY, LTD.
    Inventors: Naoki Asaba, Masamoto Nakazawa
  • Patent number: 10277776
    Abstract: An image reading device includes: a scanner having characteristics of causing a distorted sine wave being formed by its obtained image data and being represented as an array of shade values arranged in a main scanning direction; a reference member to be scanned; a hardware processor that: obtains a shade value at each main scanning coordinate from shading reference data obtained from the reference member; detects the start and end position of a distorted waveform range in the shading reference data; defines the start and end position of a target range as the main scanning coordinates of two peaks, the two peaks being in a distorted sine wave formed by the shading reference data, the two peaks being within a predetermined reference distance to the right and left of the start and end position; and replaces a part of data in the target range with a substitute part of data.
    Type: Grant
    Filed: December 4, 2017
    Date of Patent: April 30, 2019
    Assignee: KONICA MINOLTA, INC.
    Inventors: Shota Fujioka, Tomoo Yamanaka, Tomohiro Yamaguchi
  • Patent number: 10218872
    Abstract: A document reading device (20) includes: a document conveyance section (6) and a document reading device (5). A conveyed document reading region (161b) has: a document discharge guide (51) arranged downstream of an image reading position (163a) in a document conveyance direction; and a transparent reading sheet (52) provided along a surface of the contact glass (161) and a surface of the document discharge guide (51), the document conveyance section (6) has a reading guide (62) forming a document conveyance path oppositely to the conveyed document reading region (161b), and the reading guide (62) has, on part of a surface opposing the conveyed document reading region (161b), a black reference member (620) optically read by an image reading section (163) for the purpose of correcting black reference data of an image of the document conveyed by the document conveyance section (6) and read by the document reading device (5).
    Type: Grant
    Filed: June 4, 2014
    Date of Patent: February 26, 2019
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Yasuyuki Horiguchi
  • Patent number: 10209660
    Abstract: Provided is an image formation device for forming a toner image as an image to be printed on a sheet to transfer and fix the unfixed toner image onto the sheet, wherein a density adjustment setting of optionally adjusting a density of a printed image by a user is provided as a printing condition, and a toner increase mode for applying, to the sheet, more toner than that in a case of selecting a maximum density selectable in the density adjustment setting is provided as a printing mode.
    Type: Grant
    Filed: September 18, 2017
    Date of Patent: February 19, 2019
    Assignee: KONICA MINOLTA, INC.
    Inventor: Masanori Murakami
  • Patent number: 10171693
    Abstract: An apparatus can include a frame having a first side and a second side spaced apart from and substantially parallel to the first side by a third side that interconnects and extends longitudinally between the first side and the second side. The third side can define a portion of a media path. A surface of the third side includes a calibration area in the media path, the calibration area extending from an input edge to an exit edge in a media path direction that is substantially transverse to the longitudinal dimension of the third side. A plurality of bars can protrude outwardly from the surface of the third side in the calibration area. Each of the bars extends in the media path direction and has a leading edge and a trailing edge, the leading edge.
    Type: Grant
    Filed: January 30, 2014
    Date of Patent: January 1, 2019
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: David M. Payne, Edward A. Hill
  • Patent number: 10171694
    Abstract: A conveyance device that conveys paper through a conveyance path along a surface thereof includes: a conveyance guide that has a guide surface to be a wall surface on one side of the conveyance path, an opening being formed in the guide surface; a paper detection unit at least including a detection member, which is arranged in a space that communicates with the conveyance path through the opening, and configured to detect, with the detection member, a leading end of the paper that reaches the opening; and a movable body that brings the detection member into a retracted state, in which a main part thereof is covered from the space, after the leading end of the paper is detected.
    Type: Grant
    Filed: June 13, 2017
    Date of Patent: January 1, 2019
    Assignee: KONICA MINOLTA, INC.
    Inventors: Yutaka Mizota, Ichiro Muramatsu, Akiyoshi Johdai
  • Patent number: 10136027
    Abstract: An image reading apparatus according to an embodiment includes an image reading unit configured to generate reference data by reading a reference surface and to generate image data by reading a sheet. A reference unit has a reference surface. A shading correction unit determines whether a portion of the reference surface includes a contaminant based on image data generated by the image reading unit reading the portion of the reference unit. When the portion of the reference surface is determined to not include a contaminant, the shading correction unit generates reference data based on the image data generated by the image reading unit reading the portion of the reference surface determined to not include a contaminant.
    Type: Grant
    Filed: January 12, 2017
    Date of Patent: November 20, 2018
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA TEC KABUSHIKI KAISHA
    Inventor: Naoyuki Misaka
  • Patent number: 10122885
    Abstract: An image reading device includes: an FB glass; a sensor module having a light source and a plurality of sensors; and an image processor that generates correction data to be used for shading correction and performs the shading correction on image signals by using the correction data. The plurality of sensors is arranged in a main scanning direction and is configured to form an image signal on a single line. The image processor acquires second black data by causing the plurality of sensors to acquire an image signal of a reference sheet placed on the FB glass with the light source turned on, and generates black correction data based on the second black data. By performing the shading correction by using the black correction data, the image processor corrects density unevenness, in an image, caused by interference between image signals from the plurality of sensors.
    Type: Grant
    Filed: August 11, 2017
    Date of Patent: November 6, 2018
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Hirotsugu Fusayasu, Ryo Matsubara, Katsuo Inokuchi, Tatsuya Hirota, Yuuichi Tutiya
  • Patent number: 10104252
    Abstract: An image reading device, which is included in an image forming apparatus and used to perform a method of reading images, includes an image reading body configured to read one of a recording medium and the recording medium together with a background area adjacent to the recording medium, a moving body disposed facing the image reading body, and a reference body as a reference in shading correction. The moving body is configured to hold the recording medium and the reference body in a direction intersecting a sheet conveying direction of the recording medium such that the recording medium and the reference body contact to and separate from the image reading body.
    Type: Grant
    Filed: November 21, 2016
    Date of Patent: October 16, 2018
    Assignee: Ricoh Company, Ltd.
    Inventors: Tetsuo Watanabe, Hideyuki Takayama, Katsuaki Miyawaki, Hiromichi Matsuda, Atsuyuki Oyamada, Jun Yamane, Takashi Hashimoto
  • Patent number: 10091390
    Abstract: An image processing apparatus obtains image data of a document image and extracts a plurality of feature points of the document image. The image processing apparatus obtains a skew angle of the document image with respect to a predetermined direction and an assembling angle of an image obtaining unit with respect to a predetermined assembling direction from a coordinate correspondence relationship between coordinates of a plurality of feature points of a registered document image registered in advance and coordinates of the plurality of extracted feature points of the document image.
    Type: Grant
    Filed: September 15, 2016
    Date of Patent: October 2, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Hirowo Inoue, Eiichi Takagi
  • Patent number: 10091393
    Abstract: A document conveying and reading device includes a drive motor, a paper ejection roller driven by the drive motor, a first reading unit arranged along a document conveying path to face one surface of the document, and a shading roller arranged along the document conveying path to face the first reading unit. The shading roller includes a white reference member used for shading correction and a conveying guide for a document that is conveyed along the document conveying path, is driven by the drive motor together with the paper ejection roller when the drive motor drives the paper ejection roller to rotate in the second direction, and is not driven by the drive motor together with the paper ejection roller when the drive motor drives the paper ejection roller to rotate in the first direction.
    Type: Grant
    Filed: January 19, 2017
    Date of Patent: October 2, 2018
    Assignees: Kabushiki Kaisha Toshiba, Toshiba TEC Kabushiki Kaisha
    Inventor: Takeshi Ito
  • Patent number: 10070011
    Abstract: In accordance with an embodiment, an image reading apparatus comprises a sensor configured to read an image in a main scanning direction; a first reference plate; a second reference plate; and a processor configured to determine a parameter for shifting shading correction data on the basis of first reference data obtained through reading on the first reference plate by the sensor and second reference data obtained through reading on the second reference plate by the sensor, set the shading correction data on the basis of data obtained through the reading on the first reference plate by the sensor, acquire image data at each reading position in the sub-scanning direction by the sensor and carry out shading correction on the image data on the basis of the shading correction data shifted according to a shift amount at the each reading position obtained from the parameter.
    Type: Grant
    Filed: March 15, 2018
    Date of Patent: September 4, 2018
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA TEC KABUSHIKI KAISHA
    Inventors: Naoyuki Misaka, Toshimitsu Ichiyanagi
  • Patent number: 10070015
    Abstract: An image reading apparatus according to an embodiment of the present invention includes: an image sensor to read a document; a movement unit configured to relatively move the document and the image sensor by using a motor as a drive source; an output unit configured to output data of a plurality of colors based on accumulated light-receiving signals by accumulating the light-receiving signals from the image sensor for each color in order for each line in a direction of the movement based on an encoder pulse output from an encoder in accordance with rotation of the motor; and a correction unit configured to perform shading correction for each piece of data of the plurality of colors output by the output unit by using a correction value to correct influence on data of the plurality of colors due to a dark current in the image sensor based on shading data.
    Type: Grant
    Filed: May 31, 2017
    Date of Patent: September 4, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Yuichi Yanagiwara
  • Patent number: 10063744
    Abstract: An image reading device includes a first unit to read one surface of a document in a first area facing a document path, a second unit disposed in the first area to read the other surface of the document, a first reference member facing the first unit at a first distance therefrom at a second position in a second area not facing the path, a second reference member facing the first unit at a second distance therefrom at a first position in the first area, a third reference member facing the second unit at the second distance therefrom, and a correction unit to correct, based on a difference between first data generated through reading of the first member by the first unit and second data generated through reading of the second member by the first unit, third data generated through reading of the third member by the second unit.
    Type: Grant
    Filed: September 27, 2016
    Date of Patent: August 28, 2018
    Assignee: Ricoh Company, Ltd
    Inventors: Susumu Miyazaki, Tomoyuki Yoshida, Tetsuo Inui, Shigefumi Imoto
  • Patent number: 10038821
    Abstract: An image reading apparatus that makes it possible to reduce the influences of dirt on a white reference chart itself, stripes caused by dust, and the like, and thereby generate accurate data for shading correction. An image processor performs shading correction on image data read by a reader unit. The read image data is compared with threshold values set for each pixel, and a pixel which is out of a range of the threshold values is determined as a singular point pixel. Data of a pixel determined as a singular point pixel is interpolated from data around the singular point pixel. Data of a pixel which is not determined as a singular point pixel is adopted as valid shading correction data. An operation controller controls the number of effective sampling lines from start to termination of sampling to be performed.
    Type: Grant
    Filed: October 7, 2016
    Date of Patent: July 31, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Daisuke Morikawa
  • Patent number: 10027919
    Abstract: A signal processing apparatus comprising: an analog-digital converter that converts an analog signal output from a pixel section of an image sensor to a digital signal using a plurality of reference signals having different slopes from each other; and a determination unit that determines a signal level at which the plurality of reference signals are changed based on a distribution of the converted digital signal, wherein the analog-digital converter performs the conversion using a reference signal having a steeper slope when the analog signal is equal to or greater than the signal level than when the analog signal is smaller than the signal level.
    Type: Grant
    Filed: February 28, 2017
    Date of Patent: July 17, 2018
    Assignee: Canon Kabushiki Kaisha
    Inventor: Takenori Kobuse
  • Patent number: 10026004
    Abstract: A method, system, and apparatus for license plate relighting comprises collecting an image of a license plate, performing license plate recognition on the image of the license plate; calculating a confidence metric for the license plate recognition; and performing a shadow detection and relighting method if the confidence metric is below a predetermined threshold, comprising identifying a shaded region of said license plate, determining if the shaded region is actually shaded, and relighting the actually shaded region.
    Type: Grant
    Filed: July 8, 2016
    Date of Patent: July 17, 2018
    Assignee: CONDUENT BUSINESS SERVICES, LLC
    Inventors: Howard Mizes, Vladimir Kozitsky
  • Patent number: 10021273
    Abstract: In an image reading device, a controller is configured to perform: calculating a ratio between first and second reference data as evaluation data; designating a target light receiving element from a plurality of light receiving elements one by one sequentially; calculating average evaluation data of the target light receiving element by averaging the evaluation data of a second number of light receiving elements located at positions apart every predetermined distance equal to a length of a first number of consecutively arranged light receiving elements; setting an evaluation range of the target light receiving element by adding/subtracting a predetermined value to/from the average evaluation data; determining whether the evaluation data falls within the evaluation range; in response to determining that the evaluation data is out of the evaluation range, revising the second reference data of the target light receiving element; and generating correction data using the second reference data after revision.
    Type: Grant
    Filed: February 8, 2017
    Date of Patent: July 10, 2018
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventor: Takashi Matsumi
  • Patent number: 9992375
    Abstract: An image reading device includes: a sensor module having a light source and a plurality of sensors; a white reference plate; and an image processor that generates correction data to be used for shading correction and performs the shading correction on image signals, using the correction data. The light source is configured to switch between at least a first luminous intensity and a second luminous intensity lower than the first luminous intensity. The image processor acquires intermediate data by causing the plurality of sensors to acquire an image signal of the white reference plate illuminated with the second luminous intensity, generates black correction data, based on the intermediate data, and performs the shading correction, using the black correction data, so that a density unevenness, in an image, caused by interference between image signals from the plurality of sensors.
    Type: Grant
    Filed: January 25, 2017
    Date of Patent: June 5, 2018
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Ryo Matsubara, Hirotsugu Fusayasu, Katsuo Inokuchi, Tatsuya Hirota, Yuuichi Tutiya
  • Patent number: 9965695
    Abstract: A method for binarizing a grayscale document image, which first divides the document image into a plurality of sub-images and determining a type of each sub-image based on a horizontal projection profile and a density of each sub-image, the type being 1: text only, 2: graphics only, 3: photo only, 4: text and graphics, 5: text and photo, 6: graphics and photo, or 7: text and graphics and photo. Then a selected one of first to seventh binarization processes is applied to binarize each sub-image based on its type to generate a binary sub-image. All binary sub-images are then combine to generate a binary image of the grayscale document image. Of the first to seventh binarization processes respectively applied to the first to seventh types of sub-images, at least those for the first, second, third, fifth, sixth and seventh type are different from each other.
    Type: Grant
    Filed: December 30, 2016
    Date of Patent: May 8, 2018
    Assignee: KONICA MINOLTA LABORATORY U.S.A., INC.
    Inventor: Wei Ming
  • Patent number: 9948815
    Abstract: There is provided a control method for an image reading apparatus including a document conveyance unit configured to convey a document, a first reading unit configured to read a first surface of the document conveyed by the document conveyance unit, and a second reading unit configured to read a second surface of the document conveyed by the document conveyance unit, includes setting a two-sided reading mode for reading the first surface and the second surface of the document, and starting initial adjustment operation of the second reading unit in response to setting of the two-sided reading mode.
    Type: Grant
    Filed: August 2, 2016
    Date of Patent: April 17, 2018
    Assignee: Canon Kabushiki Kaisha
    Inventor: Junichi Mori
  • Patent number: 9939770
    Abstract: An image reading apparatus includes a first scanner provided in a housing, a conveyance unit, and a first calibration member. The conveyance unit is provided with a separation unit which separates the first calibration member upward from the first scanner. When the first calibration member is separated, the separation unit releases connection between the conveyance unit and the housing.
    Type: Grant
    Filed: February 21, 2017
    Date of Patent: April 10, 2018
    Assignee: KONICA MINOLTA, INC.
    Inventor: Tianzi Xu