Image analysis – Applications – Biomedical applications
Patent
1997-12-03
2000-10-17
Bella, Matthew
Image analysis
Applications
Biomedical applications
351200, G06K 900, A61B 310
Patent
active
061343412
ABSTRACT:
A method for analyzing a stereoscopic image of a fundus to detect and analyze an optic disk part on the basis of the stereoscopic image of the fundus, which can provide highly reliable results of analysis even if the fundus is inclined. The method includes: a first step of designating a disk line in the stereoscopic image of the fundus; a second step of determining a lowest point in a disk region which is determined by the designated disk line; a third step of determining a cross section of the disk region at each predetermined angle centering on the lowest point; a fourth step of determining highest points at both ends of a line of longitude on each cross section of the disk region; a fifth step of setting as a cup point a level which is lower from the highest points by a predetermined depth; and a sixth step of forming a cup rim by consecutively connecting the cup points in the cross sections of the disk region determined in the fifth step.
REFERENCES:
"Stereo Measurement of the Ocular Fundus in Ophthalmology", T. Takamoto et al., Proceedings Of SPIE, vol 361, Aug. 24-27, 1982, San Diego, pp. 324-329, XP002060643.
"Topographic Analysis of Ocular Fundus Using the Fourier Transform Method for Projected Grating Images", T. Yoshimura et al., Optical Review, vol.42, No. 5, 1995, pp. 388-393, XP002060644.
"Integrating Stereo and Photometric Stereo to Monitor the Development of Glaucoma", Lee et al., Image and Vision Computing, vol. 9, No. 1, Feb. 1991, pp. 39-44, XP002060645.
Kawamura Masunori
Nanjo Tsuguo
Noda Manabu
Bella Matthew
Nidek Co. Ltd.
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