Edge spline reconstruction... Easy Question

Dear all,

I have an image I want to extract the edge, reconstruct it with a spline and then save the results as image array. I have binarized the image first, then used bwboundaries to get the edge and then sline. However, I would like to have the same type of output that is given by the MATLAB fuction edge() (which is a matrix). How can I do that? So basically I need to build up a matrix from a list of vectors, so that if I use the imasc() function, I can see all my recontstructed edges.

I attach my code, the image and the fuction I use to get the reconstructed edge.

Best regards

Fracesco

Answer 1

[Yash]

Hi Francesco Pignatelli,

To convert the ouput of the bwboundaries into a matrix of edge values like the function edge() does, you can create a zero matrix of the size(BW), iterate through the output of the bwboundaries and mark the corresponding indices as 1 in the newly created matrix.

Here's some example code :

In your attached file Sigur.m you can modify the for loop to this

edgeMatrix = zeros(size(BW));

for i = 1:numel(boundaries)
    boundary = boundaries{i};
    [row,~] = size(boundary);
    for i = 1:row
        x = boundary(i,1);
        y = boundary(i,2);
        edgeMatrix(x,y) = 1;
    end
	% xy = boundaries{i};
	% plot(xy(:,2),xy(:,1),".")
end

imwrite(edgeMatrix, 'edgeMatrix.png');

With this you can see all the reconstructed edges. I hope this helps :)