Patents by Inventor Tomohiko Matsuura

Tomohiko Matsuura 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: 20090046916
    Abstract: A CT scanner which can reconstruct high-quality tomographic images using only the projected images obtained by scanning an object without requiring any special three-dimensional phantom is provided. A two-dimensional radiation sensor placed to face a radiation source via the object acquires projected images while relatively rotating the object in the radiation emitted from the radiation source. Tomographic images are obtained at one predetermined slice position of the object by performing, for each of geometrical calibration parameter values, reconstruction of a tomographic image of the object using one of the calibration parameter values based on acquired projected images. One of the calibration parameter values is selected based on the obtained tomographic images. A tomographic image is reconstructed at each slice position by using a selected calibration parameter value based on a projected image at each acquired slice position of the object.
    Type: Application
    Filed: August 1, 2008
    Publication date: February 19, 2009
    Applicant: CANON KABUSHIKI KAISHA
    Inventor: Tomohiko Matsuura
  • Patent number: 7418122
    Abstract: An image processing apparatus acquires a first region image by eliminating a non-X-ray irradiated region and a direct irradiated region from an X-ray image, and decides an initial region in the first region image by analyzing the first region image. The initial region is enlarged by using a region growing processing to obtain a second region in the first region image.
    Type: Grant
    Filed: March 14, 2005
    Date of Patent: August 26, 2008
    Assignee: Canon Kabushiki Kaisha
    Inventor: Tomohiko Matsuura
  • Patent number: 7401691
    Abstract: A mountainous or valley-shaped curved part 13 is provided in a part of a footstep guide rail 3 for guiding a movement of footstep rollers 5 linked by a footstep chain 7, the part being positioned in the vicinity of a drive sprocket 9. Consequently, owing to meshing of the footstep rollers 5 with the drive sprocket 9, an unevenness in velocity of the footstep rollers 5 is absorbed by the curved part 13, so that a moving velocity of the footstep rollers 5 moving on the downstream of the curved part 13 is maintained constantly, suppressing vibrating of the footsteps 4.
    Type: Grant
    Filed: February 28, 2003
    Date of Patent: July 22, 2008
    Assignee: Toshiba Elevator Kabushiki Kaisha
    Inventors: Yoshinobu Ishikawa, Tadashi Munakata, Yoshio Ogimura, Nobuhiko Teshima, Shigeo Nakagaki, Hitoshi Kawamoto, Kenichi Fujii, Tomohiko Matsuura, Yoshifumi Ikeda, Kazuhisa Hara, Takayuki Kikuchi
  • Patent number: 7327823
    Abstract: In a radiation image processing apparatus and method, body movement information of a subject to be inspected is extracted during CT scanning. It is then determined whether or not a repeat radiograph is required based on the body movement information of the subject. If it is determined that a repeat radiograph is not required, a CT image is reconstructed from projection images. If it is determined that a repeat radiograph is required, the need for a repeat radiograph is instructed.
    Type: Grant
    Filed: October 22, 2004
    Date of Patent: February 5, 2008
    Assignee: Canon Kabushiki Kaisha
    Inventor: Tomohiko Matsuura
  • Patent number: 7263155
    Abstract: A plurality of pieces of image data processed by a preprocessed circuit are sequentially received and at least one representative image is selected from among the plurality of pieces of image data by a representative image selection circuit. For example, one piece of image data out of every 250 pieces of image data is selected from among 1000 pieces of acquired image data to select four pieces of image data as representative images. An irradiated area extraction circuit extracts X-ray irradiated areas of the representative images. A reconstruction area determination circuit determines a CT reconstruction area on the basis of the X-ray irradiated areas. The reconstruction circuit reconstructs CT images from all or part of the acquired image data on the basis of the CT reconstruction area.
    Type: Grant
    Filed: September 21, 2004
    Date of Patent: August 28, 2007
    Assignee: Canon Kabushiki Kaisha
    Inventor: Tomohiko Matsuura
  • Patent number: 7245776
    Abstract: An object of this invention is to efficiently attain noise removal. In order to achieve the object, the discrete wavelet transforms of an input image are computed to output wavelet coefficients of respective subbands (S301). Appropriate threshold values are respectively set for subbands HL, LH, and HH indicating high-frequency components (S302a, S302b, S302c). The wavelet coefficients of the subbands HL, LH, and HH then undergo threshold value processes using the set threshold values for the respective subbands (S303a, S303b, S303c). Pixels to be processed in a coefficient conversion process are determined based on the threshold value processing results of the respective subbands (S304). The wavelet coefficients of the respective subbands corresponding to the pixels to be processed determined in step S304 undergo coefficient conversion (S305), and the converted transformation coefficients undergo inverse discrete wavelet transformation, thus reconstructing and outputting a noise-removed image (S306).
    Type: Grant
    Filed: September 16, 2004
    Date of Patent: July 17, 2007
    Assignee: Canon Kabushiki Kaisha
    Inventor: Tomohiko Matsuura
  • Publication number: 20070071299
    Abstract: Frame image data sets obtained in sequence by computer tomographic (CT) imaging, and a difference value between pixel values of corresponding pixels in two consecutive frames included in the frame image data sets. Then, the difference value is compared with a threshold value. If the difference value is smaller than the threshold value, the CT imaging is continued, whereas if the difference value is greater, it is determined re-imaging is required. Then, operation is completed. If it is determined that CT imaging is to be continued, it is determined whether or not all projected images scheduled to be obtained are obtained. If not, the subsequent frame is obtained, and the step of computing the difference value and the subsequent steps are repeated. It is determined that all projected images to be obtained are obtained, a CT image is reconstructed from the frame image data sets. Then, the operation is completed.
    Type: Application
    Filed: September 22, 2006
    Publication date: March 29, 2007
    Applicant: CANON KABUSHIKI KAISHA
    Inventor: Tomohiko Matsuura
  • Publication number: 20070007106
    Abstract: A mountainous or valley-shaped curved part 13 is provided in a part of a footstep guide rail 3 for guiding a movement of footstep rollers 5 linked by a footstep chain 7, the part being positioned in the vicinity of a drive sprocket 9. Consequently, owing to meshing of the footstep rollers 5 with the drive sprocket 9, an unevenness in velocity of the footstep rollers 5 is absorbed by the curved part 13, so that a moving velocity of the footstep rollers 5 moving on the downstream of the curved part 13 is maintained constantly, suppressing vibrating of the footsteps 4.
    Type: Application
    Filed: February 28, 2003
    Publication date: January 11, 2007
    Applicant: TOSHIBA ELEVATOR KABUSHIKI KAISHA
    Inventors: Yoshinobu Ishikawa, Tadashi Munakata, Yoshio Ogimura, Nobuhiko Teshima, Shigeo Nakagaki, Hiroshi Kawamoto, Kenichi Fujii, Tomohiko Matsuura, Yoshifumi Ikeda, Kazuhisa Hara, Takayuki Kikuchi
  • Publication number: 20060108196
    Abstract: A mountainous or valley-shaped curved part 13 is provided in a part of a footstep guide rail 3 for guiding a movement of footstep rollers 5 linked by a footstep chain 7, the part being positioned in the vicinity of a drive sprocket 9. Consequently, owing to meshing of the footstep rollers 5 with the drive sprocket 9, an unevenness in velocity of the footstep rollers 5 is absorbed by the curved part 13, so that a moving velocity of the footstep rollers 5 moving on the downstream of the curved part 13 is maintained constantly, suppressing vibrating of the footsteps 4.
    Type: Application
    Filed: September 12, 2005
    Publication date: May 25, 2006
    Applicant: Toshiba Elevator Kabushiki Kaisha
    Inventors: Yoshinobu Ishikawa, Tadashi Munakata, Yoshio Ogimura, Nobuhiko Teshima, Shigeo Nakagaki, Hitoshi Kawamoto, Kenichi Fujii, Tomohiko Matsuura, Yoshifumi Ikeda, Kazuhisa Hara, Takayuki Kikuchi
  • Patent number: 6985632
    Abstract: Obtains an image from which noise is removed upon compressing or decoding and displaying an image containing noise. To accomplish this, a subband to which a wavelet transform coefficient of interest belongs is checked upon entropy decoding, and when the coefficient belongs to a subband other than LL, decoding is aborted at a predetermined lower-limit bit plane, and all bits contained in bit planes from the lower-limit bit plane to the least significant bit plane are set at zero.
    Type: Grant
    Filed: April 17, 2001
    Date of Patent: January 10, 2006
    Assignee: Canon Kabushiki Kaisha
    Inventors: Makoto Sato, Tomohiko Matsuura, Hiroyuki Shinbata
  • Patent number: 6975753
    Abstract: In order to eliminate noise from an X-ray image by obtaining transform coefficients of a wavelet transform based upon information contained in tile-by-tile image data and obtaining image data based upon these transform coefficients, the entirety of a pre-processed original image is segmented into a plurality of tiles (S301). Wavelet transform coefficients of each tile obtained by segmentation are output (S302). Each tile is subjected to texture analysis and the results of analysis are output (S303). Next, a coefficient conversion is applied to the wavelet transform coefficients of each tile based upon the results of analysis (S304). High-frequency components among the transform coefficients are subjected to coefficient conversion. Next, an inverse discrete wavelet transform is applied to the wavelet transform coefficients of each area that has undergone conversion, whereby an image from which noise has been eliminated is output (S306).
    Type: Grant
    Filed: September 10, 2001
    Date of Patent: December 13, 2005
    Assignee: Canon Kabushiki Kaisha
    Inventors: Tomohiko Matsuura, Hiroyuki Shinbata, Makoto Sato
  • Publication number: 20050207632
    Abstract: An image processing apparatus acquires a first region image by eliminating an non-X-ray irradiated region and a direct irradiated region from an X-ray image, decides an initial region in the first region image by analyzing the first region image, enlarges the initial region by using a region growing processing to obtain a second region in the first region image, and obtains a second region image which corresponds to the second region of the X-ray image.
    Type: Application
    Filed: March 14, 2005
    Publication date: September 22, 2005
    Applicant: Canon Kabushiki Kaisha
    Inventor: Tomohiko Matsuura
  • Publication number: 20050111614
    Abstract: In a radiation image processing apparatus and method, body movement information of a subject to be inspected is extracted during CT scanning. It is then determined whether or not a repeat radiograph is required based on the body movement information of the subject. If it is determined that a repeat radiograph is not required, a CT image is reconstructed from projection images. If it is determined that a repeat radiograph is required, the need for a repeat radiograph is instructed.
    Type: Application
    Filed: October 22, 2004
    Publication date: May 26, 2005
    Applicant: CANON KABUSHIKI KAISHA
    Inventor: Tomohiko Matsuura
  • Publication number: 20050111615
    Abstract: A plurality of pieces of image data processed by a preprocessed circuit are sequentially received and at least one representative image is selected from among the plurality of pieces of image data by a representative image selection circuit. For example, one piece of image data out of every 250 pieces of image data is selected from among 1000 pieces of acquired image data to select four pieces of image data as representative images. An irradiated area extraction circuit extracts X-ray irradiated areas of the representative images. A reconstruction area determination circuit determines a CT reconstruction area on the basis of the X-ray irradiated areas. The reconstruction circuit reconstructs CT images from all or part of the acquired image data on the basis of the CT reconstruction area.
    Type: Application
    Filed: September 21, 2004
    Publication date: May 26, 2005
    Applicant: Canon Kabushiki Kaisha
    Inventor: Tomohiko Matsuura
  • Patent number: 6885770
    Abstract: It is an object to enable an irradiation field to be accurately extracted. An irradiation field extracting method of extracting an irradiation field from a radiation image is constructed by a step of extracting characteristic points in the radiation image by using geometric patterns for detecting an irradiation field edge and a step of detecting an edge portion of the irradiation field on the basis of the characteristic points.
    Type: Grant
    Filed: April 12, 2001
    Date of Patent: April 26, 2005
    Assignee: Canon Kabushiki Kaisha
    Inventor: Tomohiko Matsuura
  • Publication number: 20050036707
    Abstract: An object of this invention is to efficiently attain noise removal. In order to achieve the object, the discrete wavelet transforms of an input image are computed to output wavelet coefficients of respective subbands (S301). Appropriate threshold values are respectively set for subbands HL, LH, and HH indicating high-frequency components (S302a, S302b, S302c). The wavelet coefficients of the subbands HL, LH, and HH then undergo threshold value processes using the set threshold values for the respective subbands (S303a, S303b, S303c). Pixels to be processed in a coefficient conversion process are determined based on the threshold value processing results of the respective subbands (S304). The wavelet coefficients of the respective subbands corresponding to the pixels to be processed determined in step S304 undergo coefficient conversion (S305), and the converted transformation coefficients undergo inverse discrete wavelet transformation, thus reconstructing and outputting a noise-removed image (S306).
    Type: Application
    Filed: September 16, 2004
    Publication date: February 17, 2005
    Applicant: CANON KABUSHIKI KAISHA
    Inventor: Tomohiko Matsuura
  • Patent number: 6823090
    Abstract: An object of this invention is to efficiently attain noise removal. In order to achieve the object, the discrete wavelet transforms of an input image are computed to output wavelet coefficients of respective subbands (S301). Appropriate threshold values are respectively set for subbands HL, LH, and HH indicating high-frequency components (S302a, S302b, S302c). The wavelet coefficients of the subbands HL, LH, and HH then undergo threshold value processes using the set threshold values for the respective subbands (S303a, S303b, S303c). Pixels to be processed in a coefficient conversion process are determined based on the threshold value processing results of the respective subbands (S304). The wavelet coefficients of the respective subbands corresponding to the pixels to be processed determined in step S304 undergo coefficient conversion (S305), and the converted transformation coefficients undergo inverse discrete wavelet transformation, thus reconstructing and outputting a noise-removed image (S306).
    Type: Grant
    Filed: November 8, 2001
    Date of Patent: November 23, 2004
    Assignee: Canon Kabushiki Kaisha
    Inventor: Tomohiko Matsuura
  • Patent number: 6704042
    Abstract: When stereoscopic video data is distributed through a network, some terminal cannot process the distributed stereoscopic video data because the format of the data does not correspond to the terminal. Likewise, when video data are input from a plurality of types of cameras with different stereoscopic video data formats, data of an incompatible format cannot be processed. In order to prevent this problem, there is provided a stereoscopic video apparatus which inputs stereoscopic video data, converts the format of the input stereoscopic video data into a format suitable to output operation, and outputs the converted stereoscopic video data to a network.
    Type: Grant
    Filed: December 8, 1999
    Date of Patent: March 9, 2004
    Assignee: Canon Kabushiki Kaisha
    Inventors: Taichi Matsui, Hiroaki Sato, Hideo Noro, Tomohiko Matsuura
  • Publication number: 20030128273
    Abstract: When stereoscopic video data is distributed through a network, some terminal cannot process the distributed stereoscopic video data because the format of the data does not correspond to the terminal. Likewise, when video data are input from a plurality of types of cameras with different stereoscopic video data formats, data of an incompatible format cannot be processed. In order to prevent this problem, there is provided a stereoscopic video apparatus which inputs stereoscopic video data, converts the format of the input stereoscopic video data into a format suitable to output operation, and outputs the converted stereoscopic video data to a network.
    Type: Application
    Filed: December 8, 1999
    Publication date: July 10, 2003
    Inventors: TAICHI MATSUI, HIROAKI SATO, HIDEO NORO, TOMOHIKO MATSUURA
  • Patent number: 6421452
    Abstract: An image processing apparatus or an image processing method is arranged to input image data obtained by an image pickup device and an image pickup parameter of the image pickup device used in obtaining the image data, to make a comparison between the image pickup parameter for a target image and the image pickup parameter for another image, and to decide whether or not the target image differs from the other image, according to a result of the comparison.
    Type: Grant
    Filed: July 29, 1999
    Date of Patent: July 16, 2002
    Assignee: Canon Kabushiki Kaisha
    Inventors: Tomohiko Matsuura, Yoshihiro Ishida, Takashi Oya