an improved matched filter for blood vessel detection of digital retinal images
DESCRIPTION
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. Outline. - PowerPoint PPT PresentationTRANSCRIPT
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
Outline
Introduction
Proposed method
Experiment results
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)
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
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:
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:
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
Experiment Results
Experiment Results
Experiment Results
MAA: maximum accuracy average, the average accuracy of all images.
Experiment Results
Experiment Results
Experiment Results
Experiment Results