Pixel location to intensity value
1 view (last 30 days)
Show older comments
I'm trying to create a algorithm that calculates the mean intensity of a given pixel and it's neighbors, i use the script beneath to select a slice and pixel in my volume and build a matrix with the pixel and neighbor locations. Can anybody help me to translate this location to an intensity value?
if true
% Slicenumber = round(size(MRI1 ,3)/2);
figure, imshow (MRI1(:,:,Slicenumber),[]);
uiwait(msgbox('Select a point'))
[x,y]=getpts;
Position(1) = round(double(x(1)));
Position(2) = round(double(y(1)));
Position(3) = Slicenumber;
a = [ 1 0 0; -1 0 0; 1 1 0; 0 1 0; -1 1 0; 1 -1 0; 0 -1 0; -1 -1 0];
neighbors = a+repmat(Position,[8 1]);
end
0 Comments
Accepted Answer
Image Analyst
on 11 Nov 2013
Use convolution:
grayImage = double(MRI1(:,:,Slicenumber));
kernel = ones(3)/9;
neighborhoodMeans = conv2(grayImage, kernel, 'same');
You could also use imfilter().
0 Comments
More Answers (0)
See Also
Categories
Find more on Image Processing Toolbox in Help Center and File Exchange
Products
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!