Automatic delimitation of the clinical region of interest in ultra-wide field of view images of the retina

• Author(s): Antunes, Ricardo Jorge Guerreiro
• Date: 2014
• Persistent ID: http://hdl.handle.net/10362/14203
• Origin: Repositório Institucional da UNL
• Subject(s): Clinical ROI; Fundus images; Retina; Artifacts; Eyelashes; Eyelids
• Document Type: Master thesis
• Language: English
• Advisor(s): Mora, André
• Contributor(s): RUN

Description

Retinal ultra-wide field of view images (fundus images) provides the visu-alization of a large part of the retina though, artifacts may appear in those images. Eyelashes and eyelids often cover the clinical region of interest and worse, eye-lashes can be mistaken with arteries and/or veins when those images are put through automatic diagnosis or segmentation software creating, in those cases, the appearance of false positives results. Correcting this problem, the first step in the development of qualified auto-matic diseases diagnosis programs can be done and in that way the development of an objective tool to assess diseases eradicating the human error from those processes can also be achieved. In this work the development of a tool that automatically delimitates the clinical region of interest is proposed by retrieving features from the images that will be analyzed by an automatic classifier. This automatic classifier will evaluate the information and will decide which part of the image is of interest and which part contains artifacts. The results were validated by implementing a software in C# language and validated through a statistical analysis. From those results it was confirmed that the methodology presented is capable of detecting artifacts and selecting the clin-ical region of interest in fundus images of the retina.