A method for optic disk detection in retinal images, includes: extracting a vessel tree from a retinal image; locating an optic disk in the retinal image using the vessel tree; enhancing a contrast of the optic disk; removing vessels from the contrast enhanced optic disk; detecting a boundary of the optic disk with vessels removed by generating an edge map; projecting the edge map at a plurality of angles by using a radon transform; and estimating a radius and center of the optic disk using the ...

An ophthalmic photographic apparatus is provided that is readily able to capture dynamic and still eye fundus images by infrared light-excited fluorescence. A CCD device that is sensitive to infrared light is used to capture images of the eye fundus as dynamic and still images. When the shutter button is pressed, infrared light-excited fluorescence images are obtained as still images and stored in a recording unit. The infrared light-excited fluorescence image of the eye fundus is captured as a ...

A fundus camera, of which usability is enhanced while offering an excellent combination of automatic and manual photographing, includes a photographing optical system having a photographing optical axis, a movable focusing lens and an image-pickup element, alignment-state detection means, focusing-state detection means, a fixation target presenting unit where a presenting position of a fixation target is changeable between a reference position for photographing a central portion and a peripheral...

A fundus camera (10) obtains a retinal image using a light source (62), a ring aperture (58) conjugate to the cornea, and a first aperture (54) conjugate to the iris. An apertured mirror (52) redirects the ring illumination toward the eye. An objective lens (50) between the apertured mirror (52) and the eye has an entrance pupil between the iris and the cornea of the eye. The objective lens (50) directs the ring illumination into the pupil of the eye and directs a reflected image-bearing light f...

The invention includes a computer-implemented method, system, and computer-readable medium having computer-executable modules for judging changes in components of an eye. The inventive computer-implemented method includes the steps of acquiring, displaying, and superimposing at least two digital images of the components of the eye. The method further includes the step of processing at least one of the digital images such that the superimposed images may be compared, and the step of flickering am...

An ophthalmic apparatus comprising: an illuminating optical system which projects light to an examinee' eye; an image pickup unit which color-photographs an interference image caused by interference of light reflected by a tear layer of the eye; and an analyzing part which dissolves the photographed interference image to a plurality of color components, determines an appearance of interference stripes of each color component based on a signal of each color component, and obtains a value indicati...

An object of the present invention is, when determining a line-of-sight vector of a subject, to identify a three-dimensional position of a pupil center or corneal reflection center thereof. The line-of-sight vector is determined by measuring a distance from a camera to the pupil center or corneal reflection center of the subject using a two-dimensional CMOS distance image sensor by a light time-of-flight method and obtaining position information of the pupil center and corneal reflection center ...

The invention relates to an illumination system comprising at least one beam path with means for simultaneously illuminating the test object within at least one reference wavelength range and at least one data wavelength range, each of which is coordinated with one respective color channel of an imaging recording system. The at least one data wavelength range is used for detecting a medically relevant piece of information while the at least one reference wavelength range is at least nearly invar...

A method for enhancing the performance of an eye position measurement system, said method comprising: based on a measurement of past eye positions, calculating a prediction of a future eye position; using said calculated prediction of a future eye position for reducing the latency effect of said eye position measurement system.

A fundus camera for performing fluorescent image pickup is provided. A timer is started when a fluorescent agent is infused into a body, and a mode of an amplifying ratio control part is set to AGC. AGC is then checked, and fluorescent illuminance curves of respective eyes to be examined are calculated, if the AGC is operating. A fluorescent illuminance value at a fundus is calculated from a gain value on the AGC and a corresponding time which are stored in an amplifying ratio memory, thereby de...