【图像增强】基于matlab图像增强算法提取视网膜血管【含Matlab源码 4495期】.7z

%Program for Retinal Blood Vessel Extraction %Author : Athi Narayanan S %M.E, Embedded Systems, %K.S.R College of Engineering %Erode, Tamil Nadu, India. %http://sites.google.com/site/athisnarayanan/ %s_athi1983@yahoo.co.in %Program Description %This program extracts blood vessels from a retina image using Kirsch's Templates. %Spatial Filtering of the input retina image is done with the Kirsch's %Templates in different orientations. Followed by thresholding, results in %the extracted blood vessels. The threshold can be varied to fine tune the %output. function bloodVessels = VesselExtract(inImg, threshold) %Kirsch's Templates h1=[5 -3 -3; 5 0 -3; 5 -3 -3]/15; h2=[-3 -3 5; -3 0 5; -3 -3 5]/15; h3=[-3 -3 -3; 5 0 -3; 5 5 -3]/15; h4=[-3 5 5; -3 0 5; -3 -3 -3]/15; h5=[-3 -3 -3; -3 0 -3; 5 5 5]/15; h6=[ 5 5 5; -3 0 -3; -3 -3 -3]/15; h7=[-3 -3 -3; -3 0 5; -3 5 5]/15; h8=[ 5 5 -3; 5 0 -3; -3 -3 -3]/15; %Spatial Filtering by Kirsch's Templates t1=filter2(h1,inImg); t2=filter2(h2,inImg); t3=filter2(h3,inImg); t4=filter2(h4,inImg); t5=filter2(h5,inImg); t6=filter2(h6,inImg); t7=filter2(h7,inImg); t8=filter2(h8,inImg); s=size(inImg); bloodVessels=zeros(s(1),s(2)); temp=zeros(1,8); % for i=1:s(1) for j=1:s(2) temp(1)=t1(i,j);temp(2)=t2(i,j);temp(3)=t3(i,j);temp(4)=t4(i,j); temp(5)=t5(i,j);temp(6)=t6(i,j);temp(7)=t7(i,j);temp(8)=t8(i,j); if(max(temp)>threshold) bloodVessels(i,j)=max(temp); end end end