Patents by Inventor Hironobu Yasui

Hironobu Yasui 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: 9619873
    Abstract: An image processing device includes: a calculator that calculates a gray scale histogram for each color component of an image signal; a calculator that calculates, for each color component, a maximum and a minimum of classes having a frequency greater than zero in the gray scale histogram; a determiner that generates, for each color component, a histogram having classes each having an absolute difference value between the frequencies of adjacent classes in the gray scale histogram, and compares the absolute difference values in the histograms with a value to determine, from the presence or absence of an absolute difference value exceeding the value, an image type of the image; a generator that generates a gray scale correction curve from the calculated maximum and minimum for each color component; and a corrector that performs gray scale correction on the image signal using the gray scale correction curve.
    Type: Grant
    Filed: October 21, 2013
    Date of Patent: April 11, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yuka Tsuda, Nobuhiko Yamagishi, Toshiyuki Shimizu, Takashi Hatakenaka, Junko Shinohara, Hironobu Yasui, Tomonori Fukuta, Isao Otsuka, Yoshiaki Kato
  • Patent number: 9341886
    Abstract: An image display device includes a liquid crystal panel section, a light source section divided into a plurality of regions, a light detection section detecting the light intensity of the light source section, and a timing generation section. The timing generation section generates a light emission drive signal which turns on each of the regions of the light source section according to scanning in the liquid crystal panel section, and which turns on all the regions of the light source section in a light detection period, and generates a light detection gate signal allowing the detection of the light detection section to be effective in the light detection period.
    Type: Grant
    Filed: May 6, 2013
    Date of Patent: May 17, 2016
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Noritaka Okuda, Masaaki Hanai, Hironobu Yasui, Hideki Yoshii
  • Publication number: 20150332444
    Abstract: An image processing device includes: a calculator that calculates a gray scale histogram for each color component of an image signal; a calculator that calculates, for each color component, a maximum and a minimum of classes having a frequency greater than zero in the gray scale histogram; a determiner that generates, for each color component, a histogram having classes each having an absolute difference value between the frequencies of adjacent classes in the gray scale histogram, and compares the absolute difference values in the histograms with a value to determine, from the presence or absence of an absolute difference value exceeding the value, an image type of the image; a generator that generates a gray scale correction curve from the calculated maximum and minimum for each color component; and a corrector that performs gray scale correction on the image signal using the gray scale correction curve.
    Type: Application
    Filed: October 21, 2013
    Publication date: November 19, 2015
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Yuka TSUDA, Nobuhiko YAMAGISHI, Toshiyuki SHIMIZU, Takashi HATAKENAKA, Junko SHINOHARA, Hironobu YASUI, Tomonori FUKUTA, Isao OTSUKA, Yoshiaki KATO
  • Patent number: 9164287
    Abstract: A stereoscopic image display device includes a liquid crystal panel section, a light source section, a light detection section, a light source control section, a shutter glasses section, and a timing generation section generating a light emission drive signal, a light detection gate signal, and shutter switching signals in synchronization with an image synchronization signal. The timing generation section, generates the light emission drive signal which causes each of the regions of the light source section to emit light in accordance with scanning performed in the liquid crystal panel section, and which causes all the regions of the light source section to emit light in a predetermined period, and generates the light detection gate signal which enables detection of the light detection section in the predetermined period, and generates the shutter switching signals for switching left and right shutters to a non-transmissive mode.
    Type: Grant
    Filed: May 3, 2013
    Date of Patent: October 20, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventors: Hironobu Yasui, Masaaki Hanai, Hideki Yoshii
  • Patent number: 9053672
    Abstract: A light source portion includes a plurality of back lights provided corresponding to respective regions obtained by virtually dividing a liquid crystal panel screen into a plurality of parts, the back lights have a light emission intensity controlled based on a light emission intensity value and have ON and OFF operations controlled in response to a light emission driving signal, and the light emission driving signal is constituted to sequentially turn ON the plurality of back lights synchronously with a stereoscopic image signal and to turn ON the plurality of back lights at the same time in a predetermined timing, and is constituted to individually control a light emission period for the plurality of back lights based on image information about the stereoscopic image signal.
    Type: Grant
    Filed: April 29, 2013
    Date of Patent: June 9, 2015
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Hironobu Yasui, Masaaki Hanai, Hideki Yoshii
  • Publication number: 20130314457
    Abstract: A light source portion includes a plurality of back lights provided corresponding to respective regions obtained by virtually dividing a liquid crystal panel screen into a plurality of parts, the back lights have a light emission intensity controlled based on a light emission intensity value and have ON and OFF operations controlled in response to a light emission driving signal, and the light emission driving signal is constituted to sequentially turn ON the plurality of back lights synchronously with a stereoscopic image signal and to turn ON the plurality of back lights at the same time in a predetermined timing, and is constituted to individually control a light emission period for the plurality of back lights based on image information about the stereoscopic image signal.
    Type: Application
    Filed: April 29, 2013
    Publication date: November 28, 2013
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Hironobu YASUI, Masaaki HANAI, Hideki YOSHII
  • Publication number: 20130314629
    Abstract: A stereoscopic image display device includes a liquid crystal panel section, a light source section, a light detection section, a light source control section, a shutter glasses section, and a timing generation section generating a light emission drive signal, a light detection gate signal, and shutter switching signals in synchronization with an image synchronization signal. The timing generation section, generates the light emission drive signal which causes each of the regions of the light source section to emit light in accordance with scanning performed in the liquid crystal panel section, and which causes all the regions of the light source section to emit light in a predetermined period, and generates the light detection gate signal which enables detection of the light detection section in the predetermined period, and generates the shutter switching signals for switching left and right shutters to a non-transmissive mode.
    Type: Application
    Filed: May 3, 2013
    Publication date: November 28, 2013
    Applicant: Mitsubishi Electric Corporation
    Inventors: Hironobu YASUI, Masaaki HANAI, Hideki YOSHII
  • Publication number: 20130314641
    Abstract: An image display device includes a liquid crystal panel section, a light source section divided into a plurality of regions, a light detection section detecting the light intensity of the light source section, and a timing generation section. The timing generation section generates a light emission drive signal which turns on each of the regions of the light source section according to scanning in the liquid crystal panel section, and which turns on all the regions of the light source section in a light detection period, and generates a light detection gate signal allowing the detection of the light detection section to be effective in the light detection period.
    Type: Application
    Filed: May 6, 2013
    Publication date: November 28, 2013
    Applicant: Mitsubishi Electric Corporation
    Inventors: Noritaka OKUDA, Masaaki HANAI, Hironobu YASUI, Hideki YOSHII
  • Patent number: 8558772
    Abstract: An image processing apparatus is obtained which is capable of performing gray-level correction while maintaining real-time property and accurately recognizing the feature of content obtained from an image signal. A luminance information detecting block detects a luminance information value about individual pixels from a luminance signal contained in an image signal. On the basis of the luminance information value, a content feature detecting block determines the feature of one frame of the video content, and obtains a content feature judge information value. On the basis of the content feature judge information value, a multiple content feature detecting block detects the feature of multiple frames of the video content, and outputs a multiple content feature judge information value to an image quality adjustment control block in an image quality adjusting block.
    Type: Grant
    Filed: July 11, 2007
    Date of Patent: October 15, 2013
    Assignee: Mitsubishi Electric Corporation
    Inventors: Nobuhiko Yamagishi, Yoshitomo Nakamura, Hironobu Yasui
  • Patent number: 8498499
    Abstract: There are provided a first intermediate image generating means (1) for generating a first intermediate image (D1) by extracting a component in a vicinity of a particular frequency band in an input image (DIN), a second intermediate image generating means (2) for generating a second intermediate image (D2) from the first intermediate image (D1), and an adding means for adding the input image (DIN) and the second intermediate image (D2). The second intermediate image generating means (2) includes a non-linear processing means (2A) that varies the content of its processing according to the pixel in the intermediate image (D1). Even if the input image includes a fold-over component on the high-frequency side or does not include an adequate high-frequency component, adequate image enhancement processing can be carried out.
    Type: Grant
    Filed: July 15, 2009
    Date of Patent: July 30, 2013
    Assignee: Mitsubishi Electric Corporation
    Inventors: Shotaro Moriya, Noritaka Okuda, Satoshi Yamanaka, Koji Minami, Hironobu Yasui
  • Patent number: 8218632
    Abstract: A frame interpolation apparatus generates a pixel value at an interpolation position by examining pairs of pixel blocks, one from a preceding reference frame and one from a following reference frame, located in positions that are point-symmetric or nearly point-symmetric with respect to the interpolation position. The pair of pixel blocks showing the greatest mutual similarity is selected, the central pixels in the selected pair of pixel blocks are taken as reference pixels, and the interpolated pixel value is generated from the reference pixel values. By routinely examining a large number of pairs of pixel blocks for each interpolation position, the frame interpolation apparatus can detect image motion accurately and generate accurate interpolated values.
    Type: Grant
    Filed: September 19, 2007
    Date of Patent: July 10, 2012
    Assignee: Mitsubishi Electric Corporation
    Inventors: Koji Minami, Toshihiro Gai, Hironobu Yasui, Shuji Sotoda, Chihiro Sakuwa, Takashi Fujiwara
  • Patent number: 8150204
    Abstract: A noise reducer for a signal determines a direction of correlation for each picture element (pixel) by calculating sums of absolute differences between a block centered on the pixel and neighboring blocks centered on surrounding pixels and choosing the direction of the neighboring block with the least sum of absolute differences. The pixel is then filtered one-dimensionally by averaging it with neighboring pixels located in the direction of correlation. This noise reduction method is simple, reliable, and avoids needless loss of detail.
    Type: Grant
    Filed: March 7, 2008
    Date of Patent: April 3, 2012
    Assignee: Mitsubishi Electric Corporation
    Inventors: Takashi Fujiwara, Toshihiro Gai, Koji Minami, Hironobu Yasui
  • Patent number: 8139157
    Abstract: A video display apparatus generates luminance information for individual frames of a video signal from histograms of the luminance component of the video signal, and classifies the content of the video signal on the basis of this information. Color saturation information is also generated from color saturation histograms, and scene changes are detected. Video correction parameters and display control parameters are derived from the content classification and color saturation information. The video signal is corrected according to the video correction parameters, and displayed according to the display control parameters. Display characteristics suitable for the video content are thereby obtained. The parameters are changed when a scene change is detected, so that the viewer is not disturbed by the change in video display characteristics.
    Type: Grant
    Filed: December 20, 2007
    Date of Patent: March 20, 2012
    Assignee: Mitsubishi Electric Corporation
    Inventors: Jun Someya, Kazuo Kyuma, Kazuhiko Tsutsumi, Hiroaki Sugiura, Hironobu Yasui
  • Publication number: 20110211766
    Abstract: There are provided a first intermediate image generating means (1) for generating a first intermediate image (D1) by extracting a component in a vicinity of a particular frequency band in an input image (DIN), a second intermediate image generating means (2) for generating a second intermediate image (D2) from the first intermediate image (D1), and an adding means for adding the input image (DIN) and the second intermediate image (D2). The second intermediate image generating means (2) includes a non-linear processing means (2A) that varies the content of its processing according to the pixel in the intermediate image (D1). Even if the input image includes a fold-over component on the high-frequency side or does not include an adequate high-frequency component, adequate image enhancement processing can be carried out.
    Type: Application
    Filed: July 15, 2009
    Publication date: September 1, 2011
    Inventors: Shotaro Moriya, Noritaka Okuda, Satoshi Yamanaka, Koji Minami, Hironobu Yasui
  • Publication number: 20080231753
    Abstract: A noise reducer for a signal determines a direction of correlation for each picture element (pixel) by calculating sums of absolute differences between a block centered on the pixel and neighboring blocks centered on surrounding pixels and choosing the direction of the neighboring block with the least sum of absolute differences. The pixel is then filtered one-dimensionally by averaging it with neighboring pixels located in the direction of correlation. This noise reduction method is simple, reliable, and avoids needless loss of detail.
    Type: Application
    Filed: March 7, 2008
    Publication date: September 25, 2008
    Inventors: Takashi Fujiwara, Toshihiro Gai, Koji Minami, Hironobu Yasui
  • Publication number: 20080186413
    Abstract: A video display apparatus generates luminance information for individual frames of a video signal from histograms of the luminance component of the video signal, and classifies the content of the video signal on the basis of this information. Color saturation information is also generated from color saturation histograms, and scene changes are detected. Video correction parameters and display control parameters are derived from the content classification and color saturation information. The video signal is corrected according to the video correction parameters, and displayed according to the display control parameters. Display characteristics suitable for the video content are thereby obtained. The parameters are changed when a scene change is detected, so that the viewer is not disturbed by the change in video display characteristics.
    Type: Application
    Filed: December 20, 2007
    Publication date: August 7, 2008
    Inventors: Jun Someya, Kazuo Kyuma, Kazuhiko Tsutsumi, Hiroaki Sugiura, Hironobu Yasui
  • Publication number: 20080069217
    Abstract: A frame interpolation apparatus generates a pixel value at an interpolation position by examining pairs of pixel blocks, one from a preceding reference frame and one from a following reference frame, located in positions that are point-symmetric or nearly point-symmetric with respect to the interpolation position. The pair of pixel blocks showing the greatest mutual similarity is selected, the central pixels in the selected pair of pixel blocks are taken as reference pixels, and the interpolated pixel value is generated from the reference pixel values. By routinely examining a large number of pairs of pixel blocks for each interpolation position, the frame interpolation apparatus can detect image motion accurately and generate accurate interpolated values.
    Type: Application
    Filed: September 19, 2007
    Publication date: March 20, 2008
    Inventors: Koji Minami, Toshihiro Gai, Hironobu Yasui, Shuji Sotoda, Chihiro Sakuwa, Takashi Fujiwara
  • Publication number: 20080030450
    Abstract: An image processing apparatus is obtained which is capable of performing gray-level correction while maintaining real-time property and accurately recognizing the feature of content obtained from an image signal. A luminance information detecting block detects a luminance information value about individual pixels from a luminance signal contained in an image signal. On the basis of the luminance information value, a content feature detecting block determines the feature of one frame of the video content, and obtains a content feature judge information value. On the basis of the content feature judge information value, a multiple content feature detecting block detects the feature of multiple frames of the video content, and outputs a multiple content feature judge information value to an image quality adjustment control block in an image quality adjusting block.
    Type: Application
    Filed: July 11, 2007
    Publication date: February 7, 2008
    Inventors: Nobuhiko Yamagishi, Yoshitomo Nakamura, Hironobu Yasui
  • Patent number: 6563276
    Abstract: A CRT display apparatus capable of displaying images in high contrast and high brightness without causing noises and halftone-reproduction degradation within dark areas is disclosed. The apparatus includes a circuit for generating an R-control signal, a G-control signal and a B-control signal by removing, from each of the R-, G- and B-video signals, portions which are below a predetermined level in amplitude, an amplification circuit for inverting and amplifying the R-, G- and B-control signals, and a selection circuit for selecting, for each of the three G1 electrodes, either a corresponding one of the R-, G- and B-control signals inverted and amplified by the amplification circuit or a potential of a predetermined value in accordance with an instruction from an outside, and applying each of the three G1 electrodes with a selected one of the corresponding one of the R-, G- and B-control signals and the potential.
    Type: Grant
    Filed: November 21, 2001
    Date of Patent: May 13, 2003
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Akinori Heishi, Hironobu Yasui, Tetsuya Shimizu
  • Patent number: 6522090
    Abstract: When an interval between a Gm electrode and a cathode is broadened with temperature, a potential change similar to a case that a Gm electrode voltage is lowered is generated. If a cathode voltage is constant, a quantity of electrons which pass is decreased whereupon a screen of a cathode ray tube becomes dark. A Gm electrode voltage control circuit is provided to a Gm electrode voltage source for control an applied voltage to the Gm electrode by time information from a time-measuring circuit such that the change of the interval between the cathode and the Gm electrode is corrected during a period of time between the time the voltage is applied to each electrode of a Hi-Gm tube and the time the change of a size of the interval between the cathode and the Gm electrode is saturated.
    Type: Grant
    Filed: October 24, 2001
    Date of Patent: February 18, 2003
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Akinori Heishi, Hironobu Yasui