How to make points on the contour of the picture?
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Veronika
el 19 de Sept. de 2016
Comentada: Veronika
el 24 de Sept. de 2016
Dear all,
I tried to make points on the contour of the picture, like this:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/156460/image.png)
This is my contour of picture:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/156462/image.jpeg)
Because I would like to after that create FEM model of this picture (contour).
This is my code:
clc;close all;clear all;
grayImage = imread('thorax-mdl.jpg');
[rows, columns, numberOfColorChannels] = size(grayImage);
if numberOfColorChannels > 1
grayImage = grayImage(:, :, 2);
end
mask_pater = grayImage > 220;
figure(3)
imshow(mask_pater);
contour(mask_pater,1,'b', 'LineWidth',4);
Thank you for your answers.
2 comentarios
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Image Analyst
el 19 de Sept. de 2016
Lower your threshold and then call bwperim() or bwboundaries().
13 comentarios
Image Analyst
el 24 de Sept. de 2016
(Sigh) Veronika, yes you do. You do need to use a binary image. Don't you remember that you said you had to use a threshold of exactly 220? Well, what does that do? It creates a binary image.
Alright, I did it for you. Just look at the code attached below the images it creates.
![](https://www.mathworks.com/matlabcentral/images/broken_image.png)
![](https://www.mathworks.com/matlabcentral/images/broken_image.png)
See -- the outlines are exactly around the small really bright blobs which you wanted. These regions are from the binary image you got when you thresholded at 220. I even put the little circles on the boundaries like you wanted.
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