![Page 1: An improved matched filter for blood vessel detection of digital retinal images](https://reader035.vdocuments.us/reader035/viewer/2022062422/56813dbd550346895da788a2/html5/thumbnails/1.jpg)
An improved matched filter for blood vessel detection of digital
retinal images
Source: Computers in Biology and Medicine (2007) pp. 262 – 267
Authors: Mohammed Al-Rawi, Munib Qutaishat, and Mohammed Arrar
Impact factor: 1.068 (2006)
Reporter: Kai Hung Chen
Date: Mar 11, 2008
![Page 2: An improved matched filter for blood vessel detection of digital retinal images](https://reader035.vdocuments.us/reader035/viewer/2022062422/56813dbd550346895da788a2/html5/thumbnails/2.jpg)
Outline
Introduction
Proposed method
Experiment results
![Page 3: An improved matched filter for blood vessel detection of digital retinal images](https://reader035.vdocuments.us/reader035/viewer/2022062422/56813dbd550346895da788a2/html5/thumbnails/3.jpg)
Introduction
(a) : The green band of a digital retina image
(b) : The profile of a one pixel width at the 200th row of the retina image shown in (a)
![Page 4: An improved matched filter for blood vessel detection of digital retinal images](https://reader035.vdocuments.us/reader035/viewer/2022062422/56813dbd550346895da788a2/html5/thumbnails/4.jpg)
Proposed Method
2 2
exp, 2
2Lyxyxk
L: the length of the vessel segment that has the same orientation
σ: the spread of the intensity profile
![Page 5: An improved matched filter for blood vessel detection of digital retinal images](https://reader035.vdocuments.us/reader035/viewer/2022062422/56813dbd550346895da788a2/html5/thumbnails/5.jpg)
Proposed Method
12 ..., ,2 ,1 wherecossin
sincos
iyxvupi
The point Pi that belongs to N is:
3 where, 2 , ,, TLuTuvuN
Neighborhood N is defined as:
![Page 6: An improved matched filter for blood vessel detection of digital retinal images](https://reader035.vdocuments.us/reader035/viewer/2022062422/56813dbd550346895da788a2/html5/thumbnails/6.jpg)
Proposed Method
Npuyxk ii 2
exp, 2
2
The corresponding weights in the kernel i ( i =1, . . . , 12 which is the number of kernels) are given by:
.in points ofnumber theis
,,1 where,,,'
Na
yxkammyxkyxk iNpiiii i
The filter is normalized as:
![Page 7: An improved matched filter for blood vessel detection of digital retinal images](https://reader035.vdocuments.us/reader035/viewer/2022062422/56813dbd550346895da788a2/html5/thumbnails/7.jpg)
Quality Factor
True pixels: pixels detected as vessels and they appear as vessels in the hand label image.
False pixels: pixels detected as vessels yet they appear as non-vessels in the hand labeled image.
true_ratio: divide the true pixels by the number of vessel pixels in the hand labeled image.
false_ratio: divide the false pixels by the number of non-vessel pixels in the hand labeled image.
Quality Factor ( QLσT ) = true_ratio − false_ratio
![Page 8: An improved matched filter for blood vessel detection of digital retinal images](https://reader035.vdocuments.us/reader035/viewer/2022062422/56813dbd550346895da788a2/html5/thumbnails/8.jpg)
Experiment Results
![Page 9: An improved matched filter for blood vessel detection of digital retinal images](https://reader035.vdocuments.us/reader035/viewer/2022062422/56813dbd550346895da788a2/html5/thumbnails/9.jpg)
Experiment Results
![Page 10: An improved matched filter for blood vessel detection of digital retinal images](https://reader035.vdocuments.us/reader035/viewer/2022062422/56813dbd550346895da788a2/html5/thumbnails/10.jpg)
Experiment Results
MAA: maximum accuracy average, the average accuracy of all images.
![Page 11: An improved matched filter for blood vessel detection of digital retinal images](https://reader035.vdocuments.us/reader035/viewer/2022062422/56813dbd550346895da788a2/html5/thumbnails/11.jpg)
Experiment Results
![Page 12: An improved matched filter for blood vessel detection of digital retinal images](https://reader035.vdocuments.us/reader035/viewer/2022062422/56813dbd550346895da788a2/html5/thumbnails/12.jpg)
Experiment Results
![Page 13: An improved matched filter for blood vessel detection of digital retinal images](https://reader035.vdocuments.us/reader035/viewer/2022062422/56813dbd550346895da788a2/html5/thumbnails/13.jpg)
Experiment Results
![Page 14: An improved matched filter for blood vessel detection of digital retinal images](https://reader035.vdocuments.us/reader035/viewer/2022062422/56813dbd550346895da788a2/html5/thumbnails/14.jpg)
Experiment Results