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Research and Application on Wavefront Detection Technology of Retinal Cells Microscope

Author: WangBo
Tutor: ShenJianXin
School: Nanjing University of Aeronautics and Astronautics
Course: Aviation Aerospace Manufacturing Engineering
Keywords: retina wavefront detection Hartmann-shack centroid detection image processing
CLC: R318.51
Type: Master's thesis
Year: 2009
Downloads: 15
Quote: 2
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Abstract


Retina-cell microscope adjusts the wave-front aberration of eye by adaptive optics technology and obtains the ideal image of the retina cells. Wave-front exploration, as an important tache of this system, provides the exact signal for wave-front emendation by the wave-front aberration scaled by the detector at the same time and the wave-front phase calculated by Wave-front reconstruction algorithm.This thesis investigates some wave-front exploring technology and each one is compared with others. Hartmann-Shack wave-front sensor is chosen as the exploring part of the system. The thesis focuses on the principle of Hartmann—Shack wave-front sensor, and labors the origin of the exploring aberration, meanwhile studying how to improve the accuracy of centroid detection by image processing. A kind of arithmetic to select the threshold which is based on mathematical morphologies is devised. A Filter is designed by making use of the shape of the facular location and it is so efficient that can get a more appropriate threshold of binarization grayscale than the normal threshold methods. The simulating experiment in allusion to the arithmetic is carried out. A optimizing method to confirm the centroid detecting window has been also proposed, which confirms the hexagon of the centroid detecting window first by mathematics and geometry, and then confirming the centre of the circle. This way makes sure of the accuracy and completeness of detection window and reduces the infection of the setting yawp and improves the accuracy of centroid detection. VC++6.0 software package was used to make the wave-front exploring software which is already installed into the retina-cell microscope system.

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CLC: > Medicine, health > Basic Medical > Medical science in general > Biomedical Engineering > Other branches of biomedical engineering > Light,laser biomedical
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