How to make points on the contour of the picture?

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Veronika
Veronika 2016-9-19
评论： Veronika 2016-9-24
Dear all,
I tried to make points on the contour of the picture, like this:
This is my contour of picture:
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.

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采纳的回答

Image Analyst
Image Analyst 2016-9-19
Lower your threshold and then call bwperim() or bwboundaries().
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Image Analyst
Image Analyst 2016-9-24
(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.
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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