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Wyszukujesz frazę "retinal image" wg kryterium: Temat


Wyświetlanie 1-4 z 4
Tytuł:
An automatic hybrid method for retinal blood vessel extraction
Autorzy:
Yang, Y.
Huang, S.
Rao, N.
Powiązania:
https://bibliotekanauki.pl/articles/907899.pdf
Data publikacji:
2008
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
naczynie krwionośne
ekstrakcja
obraz
siatkówka
morfologia matematyczna
grupowanie rozmyte
blood vessel extraction
retinal image
mathematical morphology
fuzzy clustering
Opis:
The extraction of blood vessels from retinal images is an important and challenging task in medical analysis and diagnosis. This paper presents a novel hybrid automatic approach for the extraction of retinal image vessels. The method consists in the application of mathematical morphology and a fuzzy clustering algorithm followed by a purification procedure. In mathematical morphology, the retinal image is smoothed and strengthened so that the blood vessels are enhanced and the background information is suppressed. The fuzzy clustering algorithm is then employed to the previous enhanced image for segmentation. After the fuzzy segmentation, a purification procedure is used to reduce the weak edges and noise, and the final results of the blood vessels are consequently achieved. The performance of the proposed method is compared with some existing segmentation methods and hand-labeled segmentations. The approach has been tested on a series of retinal images, and experimental results show that our technique is promising and effective.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2008, 18, 3; 399-407
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diagnosis of Retinitis Pigmentosa from Retinal Images
Autorzy:
Ravichandran, Giritharan
Elangovan, Poonguzhali
Nath, Malaya Kumar
Powiązania:
https://bibliotekanauki.pl/articles/226527.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
retinitis pigmentosa
pigment deposits
retinal fundus image
blood vessel extraction
watershed segmentation
Opis:
Retinitis pigmentosa is a genetic disorder that results in nyctalopia and its progression leads to complete loss of vision. The analysis and the study of retinal images are necessary, so as to help ophthalmologist in early detection of the retinitis pigmentosa. In this paper fundus images and Optical Coherence Tomography images are comprehensively analyzed, so as to obtain the various morphological features that characterize the retinitis pigmentosa. Pigment deposits, important trait of RP is investigated. Degree of darkness and entropy are the features used for analysis of PD. The darkness and entropy of the PD is compared with the different regions of the fundus image which is used to detect the pigments in the retinal image. Also the performance of the proposed algorithm is evaluated by using various performance metrics. The performance metrics are calculated for all 120 images of RIPS dataset. The performance metrics such as sensitivity, sensibility, specificity, accuracy, F-score, equal error rate, conformity coefficient, Jaccard’s coefficient, dice coefficient, universal quality index were calculated as 0.72, 0.96, 0.97, 0.62, 0.12, 0.09, 0.59, 0.45 and 0.62, respectively.
Źródło:
International Journal of Electronics and Telecommunications; 2019, 65, 3; 519-525
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Retained subretinal perfluorocarbon in multimodal image
Autorzy:
Guzmán Almagro, Elena
Cobo Soriano, Rosario
Fuentes-Vega, Irene
Fernández Hortelano, Ana
González Martin-Moro, Julio
Powiązania:
https://bibliotekanauki.pl/articles/2040460.pdf
Data publikacji:
2021-04-08
Wydawca:
Medical Education
Tematy:
vitreo-retinal surgery
surgical complication
optical coherence tomography
multimodal image
subretinal perfluorocarbon
Opis:
Introduction: Retained subretinal perfluoro-n-octane droplets occur in nearly 1% of the procedures. When subretinal cystoid cavities are registered, differential diagnosis including this condition is needed. Clinical case: A 77-year-old male presented three small bubbles of perfluoro-n-octane under the papillomacular bundle after vitrectomy due to a retina redetachment, evidenced by multimodal image. Conclusions: Multimodal image can help to diagnose this condition. There are several signs that can support this diagnosis. If visual acuity is threatened, removing the bubbles is mandatory, accepting risks.
Źródło:
OphthaTherapy; 2021, 8, 2; 87-91
2353-7175
2543-9987
Pojawia się w:
OphthaTherapy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improving Segmentation of 3D Retina Layers Based on Graph Theory Approach for Low Quality OCT Images
Autorzy:
Stankiewicz, A.
Marciniak, T.
Dąbrowski, A.
Stopa, M.
Rakowicz, P.
Marciniak, E.
Powiązania:
https://bibliotekanauki.pl/articles/221548.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Optical Coherence Tomography (OCT)
segmentation of retinal layers
image segmentation
graph theory
Opis:
This paper presents signal processing aspects for automatic segmentation of retinal layers of the human eye. The paper draws attention to the problems that occur during the computer image processing of images obtained with the use of the Spectral Domain Optical Coherence Tomography (SD OCT). Accuracy of the retinal layer segmentation for a set of typical 3D scans with a rather low quality was shown. Some possible ways to improve quality of the final results are pointed out. The experimental studies were performed using the so-called B-scans obtained with the OCT Copernicus HR device.
Źródło:
Metrology and Measurement Systems; 2016, 23, 2; 269-280
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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