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Digital Image Processing for OphthalmologyComputer-aided Analysis of Images of the Retina

Digital Image Processing for Ophthalmology: Computer-aided Analysis of Images of the Retina CHAP TER 2 Computer-aided Analysis of Images of the Retina 2.1 DETECTION OF ANATOMICAL FEATURES OF THE RETINA Computer-aided diagnosis of diseases affecting the eye, introduced in Section 1.3, requires the preliminary detection and delineation of the normal anatomical features of the retina, including the ONH, macula, and blood vessels [11, 18, 23, 24] (as shown in Figure 1.2). The locations of the main anatomical features can be taken as references or landmarks in the image for the detection of abnormal features. They may also be useful to mask out the normal anatomical features in the image to detect successfully the abnormal structures that could be present in an image of the retina; for example, an anatomical structure with a bright appearance located within the ONH could be ignored when detecting white lesions. 2.1.1 DETECTION OF THE OPTIC NERVE HEAD The ONH appears toward the left-hand or right-hand side of a fundus image as an approximately circular area, roughly one-sixth the width of the image in diameter, brighter than the surrounding area, and as the convergent area of the network of blood vessels [1, 25]; see Figure 1.2. In an image of a healthy retina, all of the properties http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png

Digital Image Processing for OphthalmologyComputer-aided Analysis of Images of the Retina

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Publisher
Springer International Publishing
Copyright
© Springer Nature Switzerland AG 2011
ISBN
978-3-031-00521-3
Pages
9 –13
DOI
10.1007/978-3-031-01649-3_2
Publisher site
See Chapter on Publisher Site

Abstract

CHAP TER 2 Computer-aided Analysis of Images of the Retina 2.1 DETECTION OF ANATOMICAL FEATURES OF THE RETINA Computer-aided diagnosis of diseases affecting the eye, introduced in Section 1.3, requires the preliminary detection and delineation of the normal anatomical features of the retina, including the ONH, macula, and blood vessels [11, 18, 23, 24] (as shown in Figure 1.2). The locations of the main anatomical features can be taken as references or landmarks in the image for the detection of abnormal features. They may also be useful to mask out the normal anatomical features in the image to detect successfully the abnormal structures that could be present in an image of the retina; for example, an anatomical structure with a bright appearance located within the ONH could be ignored when detecting white lesions. 2.1.1 DETECTION OF THE OPTIC NERVE HEAD The ONH appears toward the left-hand or right-hand side of a fundus image as an approximately circular area, roughly one-sixth the width of the image in diameter, brighter than the surrounding area, and as the convergent area of the network of blood vessels [1, 25]; see Figure 1.2. In an image of a healthy retina, all of the properties

Published: Jan 1, 2011

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