Detect Edges having length greater than 50km
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Nadia jabeen
on 19 Oct 2020
Commented: Nadia jabeen
on 20 Oct 2020
Hi all,
I have detected edges using Canny Edge detector. But I want to detect Edges having length greater than 50km. I have attached code. Can anyone help me to edit code to detect edges of given length?
X = cell2mat(struct2cell(load('F:\study\practise\New folder\2010\script\preprocessed2010.mat', 'Alpha')));
for k=1:length(X)
b=X(k).img;
b(b==0)=NaN;
b (b > -5) = NaN;
b (b < -32) = NaN;
figure, temp1 = imagesc(b);title('Original Image') ;colormap('gray'); colorbar;
baseFileName = sprintf('%d.jpg',k);
% % % Specify some particular, specific folder:
fullFileName = fullfile('E:\practise\images', baseFileName);
figure(gcf); % Activate the figure again.
export_fig(fullFileName);
% Get edges
A = edge(b, 'canny');
figure, temp1 = imagesc(A);title('Edge Detected Image') ;colormap('gray'); colorbar;
baseFileName = sprintf('%dCanny.jpg',k);
fullFileName = fullfile('E:\practise\images', baseFileName);
figure(gcf); % Activate the figure again.
export_fig(fullFileName);
%
end
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Accepted Answer
Image Analyst
on 19 Oct 2020
You forgot to attach preprocessed2010.mat.
After you get the binary image, A, you can call bwareaopen() to extract only those blobs with area more than however many pixels 50 km is;
fiftyKm = round(50 * pixelsPerKm);
A50 = bwareaopen(A, fiftyKm);
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