Kabushiki Kaisha Topcon

Topcon Corporation

Gaku Takeuchi

Katsuhiko Kobayashi

Masahiro Shibutani

Takao Tanabe

Yoichiro Iwa

Makoto Fujino

Yoshiaki Goto

Kazuo Nunokawa

Masayuki Hideshima

Akemi Miwa

Hiroyuki Kawashima

Kouji Nishio

Naoki Nakazawa

Noriyasu Kiryu

Yumi Kubotera

In measurement using infrared images that are obtained by nighttime aerial photography, a correspondence relationship between the infrared images is determined with high accuracy by the following method. In this method, agricultural land is photographed from the air at night by using an infrared camera mounted on a UAV. In the state in which multiple infrared light emitting points are installed on agricultural land, the agricultural land is photographed multiple times by the infrared camera while the UAV flies at night in such a manner that a part of the agricultural land is commonly contained in multiple infrared photographic images. Then, a correspondence relationship between the multiple infrared photographic images is determined by using bright points of the infrared light emitting points in the part of the agricultural land commonly contained in the infrared photographic images.

Infrared image processing method, infrared image processing device, and infrared image processing program

An ophthalmologic apparatus is disclosed. In one aspect, the apparatus includes an ocular fundus photographing systems for forming an ocular fundus image of the examined eye, based on a reflective beam from the ocular fundus of the examined eye, and an ocular fundus tracking controller for detecting a gaze direction of the examined eye by receiving the reflective beam reflected at a reflective region of an illumination region illuminated on the ocular fundus and for tracking the ocular fundus based on the detection results of the gaze direction. The ocular fundus tracking controller may include scanning mirrors for scanning an area to detect a reflective beam from the ocular fundus, tracking mirrors for controlling tracking to the ocular fundus, an objective lens disposed opposite to the examined, and an offset mirror Mfor adjusting a detection axis in a gaze direction.

Ophthalmologic apparatus

An ophthalmologic apparatus includes an imaging system that illuminates a retina of an eye, and images the retina of the eye based on reflective luminous flux from the retina, an aberration measurement part that measures optical aberration of the eye, an aberration compensation device disposed in the imaging system to compensate the optical aberration of the eye based on a signal from the aberration measurement part, a first focusing device disposed in an optical path of the imaging system to perform focusing of the image of the retina of the eye according to a refractive property of the eye, and a second focusing device disposed in the optical path of the imaging system to compensate infinitesimal spherical aberration generated by the aberration compensation device after adjustment by the first focusing device.

An ophthalmologic apparatus is disclosed. In one aspect, the apparatus includes ocular fundus photographing systems for forming an ocular fundus image of the examined eye, based on a reflective beam from the ocular fundus of the examined eye, and a light receiving element for receiving the reflective beam reflected at a reflective region of an illumination region illuminated on the ocular fundus. The apparatus further may include a tracking detector having a scanning unit for detecting a gaze direction of the tested eye, and an ocular fundus tracking controller for tracking the ocular fundus photographing system to the gaze direction.

The invention is directed to an ophthalmologic apparatus. The apparatus includes a photographing system that illuminates an ocular fundus of a tested eye, and photographs an image of the ocular fundus of the tested eye based on a reflective beam from the ocular fundus, an aberration measurement part for measuring an optical aberration of the tested eye, an aberration compensation device disposed in the photographing system for compensating the aberration of the tested eye based on signals from the aberration measurement part, and a focusing device for substantially focusing corresponding to a refractive power of the tested eye by moving a part of an optical system comprising the photographing system along an optical axis direction.

An eye's optical characteristics measuring system, comprising a target projecting means for projecting a target image on a fundus of an eye under test, a photodetecting means for guiding the target image toward a photoelectric detector, a pupil diameter measuring means, a calculating means for calculating optical characteristics of the eye under test according to distribution of optical intensity obtained based on an image acquired by the photoelectric detector, and an aperture selecting means provided on each of the target projecting means and the photodetecting means, wherein the aperture selecting means is independently driven, and apertures to restrict a projecting luminous flux and a photodetecting luminous flux are selected based on a pupil diameter of the eye under test measured by the pupil diameter measuring means.

Eye's optical characteristics measuring system

An eye's optical characteristic measuring system, comprising a target projecting system for projecting a target image to an ocular fundus of an eye under test, a photodetection optical system for guiding the target image to a photoelectric detector, a simulation image calculating unit for calculating images of the target image to be formed when a plurality of target images of different sizes are independently projected to the fundus of the eye under test based on light amount intensity distribution of the target image detected at the photoelectric detector, and a visual acuity calculating unit having a predetermined threshold value and used for detecting light amount distribution characteristics from each of the light amount intensity distribution in a predetermined longitudinal direction of a plurality of target images calculated at the simulation image calculating unit and for calculating a visual acuity value of a person under test from an intersection of the light amount distribution characteristics and the threshold value.

Eye's optical characteristic measuring system

An eye's optical characteristic measuring system comprises an aperture diaphragm arranged at a position approximately conjugate to a pupil of an eye under testing and for determining regions to pass a light beam on the pupil , a projection optical system for projecting a primary index image on a fundus of the eye under testing via the aperture diaphragm, a photodetection optical system for forming a secondary index image on a photoelectric detector via the aperture diaphragm by a reflected light beam from the fundus of the eye under testing, and detecting units and for detecting a light amount intensity distribution of the secondary index image based on a signal from the photoelectric detector.

The eye's optical characteristic measuring system of the present invention comprises a projection system for projecting a primary index image on fundus of an eye under testing, a photodetection system for forming a secondary index image on a photoelectric detector from a reflection light beam of the primary index image, detection systems and for measuring a light amount intensity distribution characteristic of the secondary index image based on a signal from the photoelectric detector, a correction optical system arranged in an optical path shared in common with the photodetection system and the detection system and for focusing the primary index image on the fundus of the eye under testing in corrected condition according to ocular refractive characteristic of the eye under testing, and a light beam switching means for switching over to a first condition to guide the reflection light beam including the scattering reflection light beam from the fundus of the eye under testing to the photoelectric detector and to a second condition to guide only the totally reflected light beam from the fundus of the eye under testing to the photoelectric detector, wherein the system is designed in such manner that light amount intensity distribution characteristics of the secondary index images formed respectively by two light beams selected by the light beam switching means can be measured based on signals from the photoelectric detector under the condition corrected by the correction optical system.

The invention provides an apparatus which detects light quantity distribution characteristics of a measuring target image projected to a fundus of an eye to be inspected and measures eye optical characteristics from the light quantity distribution characteristics. A projecting optical system has a light source and projects a measurement target to a fundus of an eye to be inspected by bundle of rays emitted from the light source, and a light receiving optical system condenses the bundle of rays reflected from the fundus of the eye. A photoelectric detector detects light quantity distribution characteristics of an image formed by the light receiving optical system, and an arithmetic unit measures eye optical characteristics of the eye based on a signal output from the photoelectric detector. A deflecting optical member for deflecting bundle of rays incident into both optical paths of the projecting optical system and the light receiving optical system is arranged so as to be rotatable.

Eye characteristic measurement apparatus with speckle noise reduction

An eye's optical characteristic measuring system, comprising an index projection system for projecting an index image on a fundus of an eye under testing, a photodetection optical system for guiding the index image toward a photoelectric detector, a simulation image calculating unit for calculating each of images of target images formed when a plurality of target images different in size are respectively projected on the fundus of the eye under testing based on a light amount intensity distribution of the index image detected on the photoelectric detector, and a visual acuity calculating unit for calculating a visual acuity value of the eye under testing, wherein the simulation image calculating unit calculates light amount intensity distributions in each of predetermined meridian directions of the images of the target images, and the visual acuity calculating unit detects a plurality of light amount intensity distribution values based on the light amount intensity distributions and calculates the visual acuity value of the eye under testing based on the plurality of light amount intensity distribution values.

Growing community of inventors

Tokyo, Japan

Gaku Takeuchi