Dissertation > Excellent graduate degree dissertation topics show

Research on Noise Degradation and Contour Extraction Algorithm for Eye Fundus OCT Images

Author: LiuTao
Tutor: LiaoQingMin
School: Tsinghua University
Course: Information and Communication Engineering
Keywords: Optical coherence tomography Wavelet decomposition and reconstruction Multiscale active contour models
CLC: TP391.41
Type: Master's thesis
Year: 2010
Downloads: 118
Quote: 1
Read: Download Dissertation

Abstract


Detection and imaging technology continues to develop more and more abundant means of the medical imaging, optical coherence tomography (Optical Coherence Tomography, OCT) is one of them. The ophthalmic imaging is the representation of the application fields of OCT technology, the OCT apparatus has been widely used for the inspection of ophthalmic diseases. In order to improve the level of intelligence of the OCT instrument to ensure the accuracy of clinical diagnosis, the OCT image intelligent processing software became an essential part of the ophthalmic OCT imaging equipment. This article will fundus OCT image processing key technology research and discussion, including image noise reduction and extraction of contour information. This paper first analyzes the fundus OCT image noise characteristics as well as the performance of some of the classic image restoration algorithm, which is proposed based on wavelet decomposition and reconstruction OCT image noise reduction algorithm. Algorithm makes use of the correlation between wavelet coefficients after the wavelet decomposition airspace by calculating each wavelet coefficient signal coefficient probability to determine its suppression factor, three pairs of wavelet coefficients for different noise conditions image repression strategy, so as to realize the image noise abatement of energy and signal energy retained. Contrast experimental results show that the proposed algorithm has good fundus OCT image noise suppression effect, can effectively improve the signal-to-noise ratio and contrast of the image. Fundus OCT image contour detection is the contents of this article focuses on the other hand. Through the analysis of the contours of the image features and a variety of contour extraction algorithm performance, this paper design of image edge detection algorithm based on multi-scale active contour models (Multi-Scale Active Contour Model). Directional characteristics and means of statistical refinement algorithm uses the gradient operator evolution curve initial outline, and the outline of the characteristics of the fundus OCT image design a specific energy function, especially in the energy function of the external energy term added distance repulsion, which effectively avoid overlap or intersect two evolution curve, greatly improving the accuracy of test results. Finally, the text, obtained by means of artificial markers outline of the image of the reference standard, the results show that the overall detection performance of the algorithm, strong robustness of the \application requirements.

Related Dissertations

  1. The Analysis of the Retinal Thickness in Refractory Amblyopia Eyes,R777.44
  2. Spectral domain OCT retinal imaging technology experimental study,TP391.41
  3. Investigation of Macularmicrostructure Afterretinal Detachment with Spectral Domain Optical Coherence Tomography,R774.1
  4. The Relationship between FD-OCT Structure and Visual Field Function in Glaucoma,R775
  5. The Analysis of Influence Factor of Boshikang Soluble Granules to the Recovery Vision Function after Rhegmatogenous Retinal Detachment Urgery,R276.7
  6. Mild, moderate non- proliferative diabetic retinopathy study laser treatment of macular edema,R779.63
  7. Study on Detection Circuits for Optical Coherence Tomography,TN36
  8. Research on Optical Coherence Tomography with Double SLD Sources,TH74
  9. Polarization-sensitive Fourier-domain Optical Coherence Tomography,TN27
  10. The Observation of Long-term Therapeutic Effects of Different Clinical Approaches for Retinal Vein Occlusion,R774.1
  11. Detection of Retinal Nerve Fiber Layer Thickness of Primary Open Angle Glaucoma by Optical Coherence Tomography,R775
  12. Optlcal Coherence Tomography System Research,O436
  13. Study on Human Meridians Based on Optoelectronic and Infrared Technology,R224
  14. Study on the Evaluation of Myocardial Ischemia by Optical Coherence Tomography in Vitro and in Vivo,R541
  15. A still image codec based on wavelet transform algorithm,TN919.81
  16. The Comparison of the OCT and Endoscopic Ultrasonography in Ex Vivo Normal Tissue、Margin of the Tumor Tissue Anddigestive Tumor Tissue Imaging,R735
  17. The Study of Multifocal Electroretinogram in Diabetic Retinopathy with Photocoagulation,R587.1
  18. Retinal Thickness Change of Macular Fovea Measured by Optical Coherence Tomography after Viscocanlostomy and Trabeculectomy,R779.6
  19. Tear Meniscus Evaluation by Optical Coherence Tomography and Its Application in Diagnosis of Dry Eye.,R777.34
  20. OCT on Disk Area、Cup Area with Non-arteritic Anterior Ischaemic Optic Neuropathy,R774.6

CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Information processing (information processing) > Pattern Recognition and devices > Image recognition device
© 2012 www.DissertationTopic.Net  Mobile