2 research outputs found

    Fusion based analysis of ophthalmologic image data

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    summary:The paper presents an overview of image analysis activities of the Brno DAR group in the medical application area of retinal imaging. Particularly, illumination correction and SNR enhancement by registered averaging as preprocessing steps are briefly described; further mono- and multimodal registration methods developed for specific types of ophthalmological images, and methods for segmentation of optical disc, retinal vessel tree and autofluorescence areas are presented. Finally, the designed methods for neural fibre layer detection and evaluation on retinal images, utilising different combined texture analysis approaches and several types of classifiers, are shown. The results in all the areas are shortly commented on at the respective sections. In order to emphasise methodological aspects, the methods and results are ordered according to consequential phases of processing rather then divided according to individual medical applications

    Analysis of Retinal Image Data to Support Glaucoma Diagnosis

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    Fundus kamera je ĆĄiroce dostupnĂ© zobrazovacĂ­ zaƙízenĂ­, kterĂ© umoĆŸĆˆuje relativně rychlĂ© a nenĂĄkladnĂ© vyĆĄetƙenĂ­ zadnĂ­ho segmentu oka – sĂ­tnice. Z těchto dĆŻvodĆŻ se mnoho vĂœzkumnĂœch pracoviĆĄĆ„ zaměƙuje prĂĄvě na vĂœvoj automatickĂœch metod diagnostiky nemocĂ­ sĂ­tnice s vyuĆŸitĂ­m fundus fotografiĂ­. Tato dizertačnĂ­ prĂĄce analyzuje současnĂœ stav vědeckĂ©ho poznĂĄnĂ­ v oblasti diagnostiky glaukomu s vyuĆŸitĂ­m fundus kamery a navrhuje novou metodiku hodnocenĂ­ vrstvy nervovĂœch vlĂĄken (VNV) na sĂ­tnici pomocĂ­ texturnĂ­ analĂœzy. Spolu s touto metodikou je navrĆŸena metoda segmentace cĂ©vnĂ­ho ƙečiĆĄtě sĂ­tnice, jakoĆŸto dalĆĄĂ­ hodnotnĂœ pƙíspěvek k současnĂ©mu stavu ƙeĆĄenĂ© problematiky. Segmentace cĂ©vnĂ­ho ƙečiĆĄtě rovnÄ›ĆŸ slouĆŸĂ­ jako nezbytnĂœ krok pƙedchĂĄzejĂ­cĂ­ analĂœzu VNV. Vedle toho prĂĄce publikuje novou volně dostupnou databĂĄzi snĂ­mkĆŻ sĂ­tnice se zlatĂœmi standardy pro Ășčely hodnocenĂ­ automatickĂœch metod segmentace cĂ©vnĂ­ho ƙečiĆĄtě.Fundus camera is widely available imaging device enabling fast and cheap examination of the human retina. Hence, many researchers focus on development of automatic methods towards assessment of various retinal diseases via fundus images. This dissertation summarizes recent state-of-the-art in the field of glaucoma diagnosis using fundus camera and proposes a novel methodology for assessment of the retinal nerve fiber layer (RNFL) via texture analysis. Along with it, a method for the retinal blood vessel segmentation is introduced as an additional valuable contribution to the recent state-of-the-art in the field of retinal image processing. Segmentation of the blood vessels also serves as a necessary step preceding evaluation of the RNFL via the proposed methodology. In addition, a new publicly available high-resolution retinal image database with gold standard data is introduced as a novel opportunity for other researches to evaluate their segmentation algorithms.
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