otsu's code
3 次查看(过去 30 天)
显示 更早的评论
I need code to segment red area only from this image
1 个评论
KALYAN ACHARJYA
2017-8-29
编辑:KALYAN ACHARJYA
2017-8-29
Otsu code use for Global Thresholding.
[T SM]=graythresh(input gray image);
Where T=Threshold>output from following code function otsuthresh SM=Separability Measure
Source: Gonzalez Book (Image Processing+Matlab)
回答(2 个)
KALYAN ACHARJYA
2017-8-29
%if true
function [T,SM]=otsuthresh(h);
h=h/sum(h);
h=h(:);
i=(1:numel(h))';
P1=cumsum(h);
m=cumsum(i.*h);
mG=m(end);
sigSquared=((mG*P1-m).^2)./(P1.*(1-P1)+eps);
maxSigsq=max(sigSquared);
T=mean(find(sigSquared==maxSigsq));
T=(T-1)/(numel(h)-1);
SM=maxSigsq/(sum(((i-mG).^2).*h)+eps);
% end
0 个评论
Image Analyst
2017-8-29
shaimaa, you would NOT use Otsu for that. You need to do it "manually". First identify the values of the starting and ending thermal values in your image. Let's say the red range starts at 32 degrees and ends at 33 degrees. So then to segment out those temperatures, you'd do
binaryImage = themalImage > 32 & thermalImage < 33;
0 个评论
另请参阅
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!