JP2017184787A5

JP2017184787A5 -

Info

Publication number: JP2017184787A5
Application number: JP2016073730A
Authority: JP
Filing date: 2016-03-31
Publication date: 2019-04-18
Anticipated expiration: 2036-03-31

Claims

An objective lens system including at least one lens, an irradiation optical system for irradiating illumination light emitted from a light source to an eye to be examined through the objective lens system, reflection light of the illumination light by the eye to be examined An ophthalmologic imaging apparatus comprising: an imaging optical system including a light receiving element including a light receiving element that receives light via a system; and generating a photographed image based on a signal from the light receiving element,
Front image photographing means for obtaining a front image of an eye to be examined as the photographed image;
Background image acquiring means for acquiring a background image with respect to the front image of the eye to be examined acquired by the front image photographing means, the background image including a reflection image by at least the objective lens system;
An ophthalmologist comprising: image processing means for performing background subtraction based on the front image of the eye and the background image, and generating an image in which the influence of the reflection image is suppressed in the front image of the eye as a difference image; Shooting device.

The ophthalmology according to claim 1, wherein the background image acquisition means acquires the photographed image obtained by photographing in a light shielding state in which the subject eye side of the lens for producing the reflected image in the objective lens system is shielded from light as the background image. Shooting device.

The background image acquiring unit changes a plurality of background images having different imaging conditions while switching an imaging condition related to at least one of the output of the illumination light, the gain of the light reception signal, and the diopter of the imaging optical system. Acquired in advance by repeating the photographing in the light shielding state,
The ophthalmologic photographing apparatus according to claim 2 , wherein the image processing means selects one of the plurality of background images acquired in advance, in which the photographing condition corresponds to the front image of the eye to be examined, and performs the background subtraction.

The background image acquisition means acquires in advance at least one background image when a photographing condition regarding at least one of the output of the illumination light and the gain of the light reception signal is a first photographing condition,
When the second imaging condition which is the imaging condition when the front image of the eye to be examined is imaged by the front image imaging means, the image processing means is different from the first imaging condition in the background image The ophthalmologic photographing apparatus according to claim 2, wherein the contrast or the brightness in at least one of the front image and the background image of the eye to be examined is matched, and the background difference is performed based on the matched image.

The front image photographing means is configured to receive each of the first illumination light, which is illumination light of a first wavelength, and the second illumination light, which has a second wavelength different from the first wavelength, from the illumination optical system The first front image of the eye to be examined based on the reflected light of the first illumination light, and the second front image of the eye to be examined based on the reflected light of the second illumination light;
The background image acquisition means acquires a first background image which is a background image based on the first illumination light, and a second background image which is a background image based on the second illumination light,
The image processing means combines a first difference image based on the first front image and the first background image, and a second difference image based on the second front image and the second background image. The ophthalmologic photographing apparatus according to any one of claims 1 to 4 , wherein the synthetic differential image is obtained.

The front image photographing means is configured to receive each of the first illumination light, which is illumination light of a first wavelength, and the second illumination light, which has a second wavelength different from the first wavelength, from the illumination optical system The first front image based on the reflected light of the first illumination light and the second front image based on the reflected light of the second illumination light,
The background image acquisition means acquires a first background image which is a background image based on the first illumination light, and a second background image which is a background image based on the second illumination light,
The image processing means generates a composite difference image by a background difference based on a first composite image of the first front image and the second front image, and a composite image of the first background image and the second background image. The ophthalmologic imaging apparatus according to any one of claims 1 to 5 , wherein

The photographing optical system is an optical system for obtaining a fundus oculi image as a photographed image, and
Switching control means for controlling and switching at least the light source between a first imaging mode for imaging a fundus image by fundus reflected light and a second imaging mode for capturing a fundus image by fluorescence emitted from the fundus Have
The image processing means performs the background subtraction on the fundus image captured in the first imaging mode and does not perform the background subtraction on the fundus image captured in the second imaging mode The ophthalmologic imaging device according to any one of claims 1 to 6 .

The photographing optical system includes a first photographing mode for photographing the photographed image at a first angle of view, and a second photographing mode for photographing the photographed image at an angle of view narrower than the first angle of view And can be switched,
The image processing means performs the background subtraction on the front image of the subject's eye taken in the first imaging mode, and the front image of the subject's eye taken in the second imaging mode. The ophthalmologic imaging apparatus according to any one of claims 1 to 7 , wherein the background subtraction is not performed.

The front image photographing means and the background image acquisition means respectively acquire a front image of the eye to be examined and the background image represented by a first gradation number,
The image processing means performs a background difference between the front image of the eye to be examined and the background image represented by the first number of gradations, and a second number of gradations smaller than the first number of gradations The ophthalmologic imaging apparatus according to any one of claims 1 to 8 , which generates a differential image represented by

For processing an image taken by an ophthalmologic photographing apparatus which projects illumination light to an eye to be examined through an objective lens system including at least one lens and obtains a front image of the eye to be examined based on reflected light from the eye to be examined An image processing program, which is executed by a processor of a computer,
A first acquisition step of acquiring a front image of the eye to be examined by the ophthalmologic imaging apparatus;
A second acquisition step of acquiring a background image in a front image of the subject's eye including at least a reflection image of illumination light by the objective lens system;
An image processing step of performing background subtraction based on the front image of the eye and the background image to generate an image in which the influence of the reflection image on the front image of the eye is suppressed as a difference image;
An image processing program causing the computer to execute the program.