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Ophthalmic Photographing Apparatus
专利权人:
发明人:
申请号:
EP09161689.6
公开号:
EP2130486B1
申请日:
2009.06.02
申请国别(地区):
EP
年份:
2016
代理人:
摘要:
An ophthalmic photographing apparatus comprising a photographing optical system (200,300) for obtaining a regional image of an examinees eye, comprising a light source (27,61), a focusing optical element (24,63) movable in an optical-axis direction by a driving mechanism (24a,63a), and a photodetector (68,83), and a control unit (70) controlling driving of the mechanism and obtain the image based on a signal from the photodetector, characterized in that the control unit further moves the optical element in predetermined steps/continuously to obtain the image at each position, calculates frequency distribution of luminance of each of the images to detect a change characteristic of luminance values (Dmax,Dmin,Lmax,Lmin) having frequencies equal or exceeding a threshold value in the frequency distribution with respect to the optical element position, and detects a focus position of the optical element based on the change characteristics to move the optical element to a position corresponding to the detected focus position.
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