CODEWITHSUNDEEP
imagematlabimage-segmentation
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Reputation: 108

Error using active contour

I got an error when using active contour:

??? Undefined function or method 'activecontour' for input arguments of type 'single'.

Error in ==> Segmentasi>threshold_Callback at 114 final = activecontour(image2,mask , 100); 

image1 = handles.citra1;
    level=0.008;
    bw = edge(image1,'Canny');
    axes(handles.axes2);
    imshow(bw,[]);

    %active contour
    image2 = bwdist(~bw);
    mask = zeros(size(image2));
    mask(25:end-25,25:end-25) = 1;
    final = activecontour(image2,mask , 100);
    axes(handles.axes5)
    imshow(final,[]);
    handles.data3 = final;
    guidata(hObject,handles);

I am using an image from dicom files (sagital image)

Upvotes: 0

Views: 496

Answers (1)

NKN
NKN

Reputation: 6434

The problim is that the output of the bwdist function is a matrix and the input of the activecontour function is a grayscale image. So you need to convert the matrix to a grayscale image before using it. This is done using a function called mat2gray. To do so, after using bwdist apply mat2gray as follows:

image2 = mat2gray(bwdist(~bw));

And then the rest of the code works. Check my simple example:

bw = zeros(200,200);
bw(50,50) = 1;
bw(50,150) = 1;
bw(150,50) = 1;
D1 = bwdist(bw);

D2 = mat2gray(D1);
mask = zeros(size(D2));
mask(25:end-25,25:end-25) = 1;
final = activecontour(D2,mask,100);

subplot(1,3,1);imshow(bw)
subplot(1,3,2);imshow(mat2gray(D1))
subplot(1,3,3);imshow(final,[]);

enter image description here

Upvotes: 3

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