Patents by Inventor Tomoyuki Iwanaga
Tomoyuki Iwanaga 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).
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Patent number: 9820648Abstract: An image processing apparatus includes a generation unit and a display control unit. The generation unit generates a subtraction image using a first region and a second region, the first region being a portion of a first fundus image acquired by performing autofluorescence imaging on a fundus of an eye to be inspected, the second region being a portion of a second fundus image acquired by performing autofluorescence imaging on the fundus of the eye to be inspected at a time different from that of the first fundus image and being at a position corresponding to the first region. The display control unit causes a display unit to display an image generated by superimposing information regarding the subtraction image at a position corresponding to the first and second regions on a fundus image acquired by performing autofluorescence imaging on the fundus.Type: GrantFiled: June 27, 2014Date of Patent: November 21, 2017Assignee: Canon Kabushiki KaishaInventors: Yuji Ota, Tomoyuki Iwanaga, Manabu Wada
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Patent number: 9226659Abstract: A fundus camera according to the present invention includes a light metering unit configured to change a light metering area within an image captured by an imaging unit based on one of a position and a size of a light blocking member, and a controlling unit configured to control an amount of light emission from a light source based on a light metering value corresponding to the light metering area.Type: GrantFiled: August 16, 2011Date of Patent: January 5, 2016Assignee: Canon Kabushiki KaishaInventor: Tomoyuki Iwanaga
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Patent number: 9204793Abstract: An ophthalmologic apparatus including a splitting unit configured to split, on a light path in an optical observation system of an anterior segment of a subject's eye, an anterior segment image into a plurality of light beams at a position conjugated with the anterior segment, and an imaging unit configured to capture the anterior segment image via an image forming unit configured to form an image of the light beams coming from the anterior segment, split by the splitting unit.Type: GrantFiled: August 27, 2012Date of Patent: December 8, 2015Assignee: Canon Kabushiki KaishaInventors: Tomoyuki Iwanaga, Hiroshi Aoki, Hirofumi Yoshida
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Patent number: 9022567Abstract: An ophthalmic imaging apparatus divides a frame image obtained by capturing a moving image into a plurality of regions grouping pixels, and acquires photometric values corresponding the plurality of the regions. Further, the ophthalmic imaging apparatus determines acknowledgement or dis-acknowledgement of capturing a still image based on temporal variation of the acquired photometric values or distribution of the acquired photometric values on a fundus image. The ophthalmic imaging apparatus inhibits to execute a still image capturing of the fundus if the dis-acknowledgement of capturing is determined.Type: GrantFiled: December 17, 2013Date of Patent: May 5, 2015Assignee: Canon Kabushiki KaishaInventor: Tomoyuki Iwanaga
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Patent number: 9004684Abstract: A fundus camera includes a focus target projection unit including a focus target located at a position conjugate with a fundus of a subject's eye, a split optical element configured to split a light flux passing through the focus target, and a focus target illumination light source configured to illuminate the focus target, a fundus photographing optical system including a focusing lens, a focus link mechanism configured to interlockingly move the focus target projection unit and the focusing lens in a direction of an optical axis, at least two lenses located behind a plane optically conjugate with the imaging plane of the fundus photographing optical system and outside an optical axis of the fundus photographing optical system, image sensors respectively located behind the two lenses, and a phase difference detection unit configured to detect a phase difference between the focus target images based on signals output from the image sensors.Type: GrantFiled: April 22, 2009Date of Patent: April 14, 2015Assignee: Canon Kabushiki KaishaInventors: Tomoyuki Iwanaga, Nobuyoshi Kishida, Hideyuki Ohban, Shinya Tanaka
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Publication number: 20150002813Abstract: An image processing apparatus includes a generation unit and a display control unit. The generation unit generates a subtraction image using a first region and a second region, the first region being a portion of a first fundus image acquired by performing autofluorescence imaging on a fundus of an eye to be inspected, the second region being a portion of a second fundus image acquired by performing autofluorescence imaging on the fundus of the eye to be inspected at a time different from that of the first fundus image and being at a position corresponding to the first region. The display control unit causes a display unit to display an image generated by superimposing information regarding the subtraction image at a position corresponding to the first and second regions on a fundus image acquired by performing autofluorescence imaging on the fundus.Type: ApplicationFiled: June 27, 2014Publication date: January 1, 2015Inventors: Yuji Ota, Tomoyuki Iwanaga, Manabu Wada
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Patent number: 8857989Abstract: In an ophthalmic apparatus, reflected light from an eye to be examined, illuminated by an observation light source emitting continuous light, is split by a light splitting unit to enter an optical viewfinder, and a fundus image where an examiner can observe the fundus is provided by the optical viewfinder. An imaging unit sets the light quantity of the observation light source by using a moving image obtained by imaging the split and reflected light. After completing the setting of the light quantity, the imaging unit moves the light splitting unit from an optical axis, illuminates the fundus by driving the imaging light source, and obtains a still image.Type: GrantFiled: May 9, 2011Date of Patent: October 14, 2014Assignee: Canon Kabushiki KaishaInventor: Tomoyuki Iwanaga
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Publication number: 20140240673Abstract: Provided is an ophthalmologic imaging apparatus for analyzing a fundus image of an eye to be inspected, including: an acquiring unit for acquiring a plurality of autofluorescence images obtained by imaging the eye to be inspected at different times; a generation unit for generating a plurality of fluorescence brightness images obtained by adjusting brightness of the plurality of autofluorescence images; and a display control unit for controlling a display unit to display the plurality of autofluorescence images and the plurality of fluorescence brightness images side by side for each time when the eye to be inspected is imaged.Type: ApplicationFiled: February 12, 2014Publication date: August 28, 2014Applicant: CANON KABUSHIKI KAISHAInventor: Tomoyuki Iwanaga
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Publication number: 20140104573Abstract: An ophthalmic imaging apparatus divides a frame image obtained by capturing a moving image into a plurality of regions grouping pixels, and acquires photometric values corresponding the plurality of the regions. Further, the ophthalmic imaging apparatus determines acknowledgement or dis-acknowledgement of capturing a still image based on temporal variation of the acquired photometric values or distribution of the acquired photometric values on a fundus image. The ophthalmic imaging apparatus inhibits to execute a still image capturing of the fundus if the dis-acknowledgement of capturing is determined.Type: ApplicationFiled: December 17, 2013Publication date: April 17, 2014Applicant: CANON KABSHIKI KAISHAInventor: Tomoyuki Iwanaga
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Patent number: 8636362Abstract: An ophthalmic imaging apparatus divides a frame image obtained by capturing a moving image into a plurality of regions grouping pixels, and acquires photometric values corresponding the plurality of the regions. Further, the ophthalmic imaging apparatus determines acknowledgement or dis-acknowledgement of capturing a still image based on temporal variation of the acquired photometric values or distribution of the acquired photometric values on a fundus image. The ophthalmic imaging apparatus inhibits to execute a still image capturing of the fundus if the dis-acknowledgement of capturing is determined.Type: GrantFiled: June 26, 2013Date of Patent: January 28, 2014Assignee: Canon Kabushiki KaishaInventor: Tomoyuki Iwanaga
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Patent number: 8585203Abstract: When an observation state by an infrared LED 10 is changed to a photographing state by a xenon lamp 3, a movable mirror 16 is pulled upward and an optical path is switched to an image sensor 17 side. A light guide 22a is shifted by an alignment index drive motor 23 so that an incident portion of an alignment index is shifted from a visible LED 22b to direct to an infrared LED 22c. An outgoing portion of the light guide 22a is set at a position where an image is formed on the image sensor 17 by a wavelength of the infrared LED 22c when an operation distance is appropriate. While changing a luminescent color, a position of a luminescent point of the alignment index is changed by switching the LED by the shift of the light guide 22a.Type: GrantFiled: May 18, 2010Date of Patent: November 19, 2013Assignee: Canon Kabushiki KaishaInventors: Satoshi Aikawa, Hideyuki Ooban, Tomoyuki Iwanaga, Toshifumi Masaki
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Publication number: 20130286349Abstract: An ophthalmic imaging apparatus divides a frame image obtained by capturing a moving image into a plurality of regions grouping pixels, and acquires photometric values corresponding the plurality of the regions. Further, the ophthalmic imaging apparatus determines acknowledgement or dis-acknowledgement of capturing a still image based on temporal variation of the acquired photometric values or distribution of the acquired photometric values on a fundus image. The ophthalmic imaging apparatus inhibits to execute a still image capturing of the fundus if the dis-acknowledgement of capturing is determined.Type: ApplicationFiled: June 26, 2013Publication date: October 31, 2013Inventor: Tomoyuki Iwanaga
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Patent number: 8567947Abstract: An ophthalmic imaging apparatus divides a frame image obtained by capturing a moving image into a plurality of regions grouping pixels, and acquires photometric values corresponding the plurality of the regions. Further, the ophthalmic imaging apparatus determines acknowledgement or dis-acknowledgement of capturing a still image based on temporal variation of the acquired photometric values or distribution of the acquired photometric values on a fundus image. The ophthalmic imaging apparatus inhibits to execute a still image capturing of the fundus if the dis-acknowledgement of capturing is determined.Type: GrantFiled: May 9, 2011Date of Patent: October 29, 2013Assignee: Canon Kabushiki KaishaInventor: Tomoyuki Iwanaga
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Patent number: 8449115Abstract: An opthalmologic apparatus changes the wavelength of index light, which is projected on an eye to be examined, by selecting the light emission of a visible LED and an infrared LED, and changes the position of a split unit along an optical axis based on the selection.Type: GrantFiled: November 17, 2009Date of Patent: May 28, 2013Assignee: Canon Kabushiki KaishaInventors: Satoshi Aikawa, Hideyuki Ooban, Tomoyuki Iwanaga
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Publication number: 20130100407Abstract: An ophthalmologic apparatus including a splitting unit configured to split, on a light path in an optical observation system of an anterior segment of a subject's eye, an anterior segment image into a plurality of light beams at a position conjugated with the anterior segment, and an imaging unit configured to capture the anterior segment image via an image forming unit configured to form an image of the light beams coming from the anterior segment, split by the splitting unit.Type: ApplicationFiled: August 27, 2012Publication date: April 25, 2013Applicant: CANON KABUSHIKI KAISHAInventors: Tomoyuki Iwanaga, Hiroshi Aoki, Hirofumi Yoshida
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Publication number: 20120154748Abstract: If a position of a focus lens is greatly displaced from a focus state when automatic focusing is started, and pattern recognition cannot be performed, the process proceeds to step S3. In step S3, the lens is sequentially driven until pattern recognition can be performed. If it is determined that the pattern recognition can be performed in step S2, a focus detection range is determined in S4. In step S5, an AF evaluation value of the range is calculated, and the value is stored in step S6.Type: ApplicationFiled: August 30, 2010Publication date: June 21, 2012Applicant: CANON KABUSHIKI KAISHAInventors: Hiroyuki Inoue, Tomoyuki Iwanaga, Shinya Tanaka
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Publication number: 20120057128Abstract: When an observation state by an infrared LED 10 is changed to a photographing state by a xenon lamp 3, a movable mirror 16 is pulled upward and an optical path is switched to an image sensor 17 side. A light guide 22a is shifted by an alignment index drive motor 23 so that an incident portion of an alignment index is shifted from a visible LED 22b to direct to an infrared LED 22c. An outgoing portion of the light guide 22a is set at a position where an image is formed on the image sensor 17 by a wavelength of the infrared LED 22c when an operation distance is appropriate. While changing a luminescent color, a position of a luminescent point of the alignment index is changed by switching the LED by the shift of the light guide 22a.Type: ApplicationFiled: May 18, 2010Publication date: March 8, 2012Applicant: CANON KABUSHIKI KAISHAInventors: Satoshi Aikawa, Hideyuki Ooban, Tomoyuki Iwanaga, Toshifumi Masaki
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Publication number: 20120044458Abstract: A fundus camera according to the present invention includes a light metering unit configured to change a light metering area within an image captured by an imaging unit based on one of a position and a size of a light blocking member, and a controlling unit configured to control an amount of light emission from a light source based on a light metering value corresponding to the light metering area.Type: ApplicationFiled: August 16, 2011Publication date: February 23, 2012Applicant: CANON KABUSHIKI KAISHAInventor: Tomoyuki Iwanaga
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Patent number: 8070291Abstract: A fundus camera includes an illumination unit which includes an optical element configured to irradiate an eye fundus with visible light from a position conjugate with an anterior eye portion of an eye to be examined, and an imaging unit configured to take an image of the eye fundus with light which is emitted from the illumination unit and reflected from the eye fundus, wherein the illumination unit includes a blue LED chip and a fluorescent member that is excited by light emitted from the blue LED chip and emits fluorescence, and the fluorescent member is irradiated again with a part of the light reflected by the optical element.Type: GrantFiled: February 25, 2011Date of Patent: December 6, 2011Assignee: Canon Kabushiki KaishaInventors: Tomoyuki Iwanaga, Manabu Wada, Shinya Tanaka
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Publication number: 20110292337Abstract: In an ophthalmic apparatus, reflected light from an eye to be examined, illuminated by an observation light source of emitting continuous light is split into a light splitting unit and an optical viewfinder, and a fundus image where an examiner can observe is provided by the optical viewfinder. An imaging unit sets light quantity of the observation light source by using a moving image obtained by imaging the split and reflected light. After completing the setting of the light quantity, the imaging unit moves the light splitting unit from an optical axis, illuminates the fundus by driving the imaging light source, and obtains a still image.Type: ApplicationFiled: May 9, 2011Publication date: December 1, 2011Applicant: CANON KABUSHIKI KAISHAInventor: Tomoyuki Iwanaga