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Ophthalmologic apparatus, and control method thereof

An ophthalmic device and control method technology, applied in ophthalmoscope, medical science, equipment for testing eyes, etc., can solve the problems that the contrast evaluation is not performed correctly, the accuracy of automatic focus is reduced, etc.

Inactive Publication Date: 2014-05-14
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, images other than the fundus image captured in the focus detection area cause the autofocus accuracy to decrease compared to the case where only the contrast of the fundus image is detected
In other words, contrast evaluation is not performed correctly and focusing is done in the out-of-focus state

Method used

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  • Ophthalmologic apparatus, and control method thereof
  • Ophthalmologic apparatus, and control method thereof
  • Ophthalmologic apparatus, and control method thereof

Examples

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Deformed example 1

[0055] In the above-described exemplary embodiments, a plurality of candidate focus detection areas are set in advance, and one of them is selected and determined as the focus detection area. But the present invention is not limited thereto, if there is an index image in the focus detection area, at least one of the position and the size of the focus detection area may be changed without setting candidate focus detection areas in advance.

[0056] As for the change of the focus detection area, the center position of the focus detection area may be changed without changing its size, or the size of the focus detection area may be changed without changing its center position. Alternatively, the center position and size of the focus detection area may also be changed.

Deformed example 2

[0058] In the above exemplary embodiments, a fundus camera having only the function of photographing the fundus of the eye to be inspected has been described, however, it may also be an ophthalmic device having the function of, for example, photographing the fundus of the eye to be inspected and measuring the blood flow velocity. and vascular caliber to calculate blood flow. In other words, the present invention is not limited to fundus cameras.

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Abstract

The present invention discloses an ophthalmologic apparatus, and a control method thereof. The ophthalmologic apparatus includes an illumination projection unit configured to project an illumination light onto a fundus of a subject's eye, an index projection unit configured to project an index onto the subject's eye, an image capturing unit configured to capture a fundus image including an index image based on light returning from the subject's eye, a focusing unit configured to focus the light returning from the subject's eye onto the photographic unit, a detection unit configured to detect a position of the index image in the fundus image, a determination unit configured to determine the area in the fundus image which does not include the index image based on results detected by the detection unit, and a control unit configured to control the focusing unit based on contrast of the area determined by the determination unit.

Description

technical field [0001] The present invention relates to an ophthalmic device suitable for a fundus camera equipped with an automatic focusing mechanism and a control method thereof. Background technique [0002] In the conventional fundus camera, there are mainly two methods known as a method of focusing light on the fundus of the eye to be inspected. One method is to project a focus mark onto the fundus of the eye to be inspected, and perform focusing using the focus mark image reflected from the fundus. Another method is to perform focusing by detecting the contrast of the fundus of the subject's eye. [0003] Japanese Patent Laid-Open No. 5-95907 using the former method discusses a fundus camera in which a focus mark is projected to the fundus, and an imaging optical system captures a focus mark image to detect a focus state. Japanese Patent Application Laid-Open No. 5-95907 also discusses a technique for blocking and attenuating a light source for detecting a fixed tar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B3/14A61B3/12
CPCA61B3/14A61B3/12
Inventor 松冈龙太郎
Owner CANON KK