How to make points on the contour of the picture?

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Veronika 2016-9-19

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https://ww2.mathworks.cn/matlabcentral/answers/303584-how-to-make-points-on-the-contour-of-the-picture

评论： Veronika 2016-9-24

采纳的回答： Image Analyst

thorax-mdl.jpg

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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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KSSV 2016-9-19

You should have attached the image...

Veronika 2016-9-19

thorax-mdl.jpg

Sorry, I forgot. Here is the image.

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Image Analyst 2016-9-19

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https://ww2.mathworks.cn/matlabcentral/answers/303584-how-to-make-points-on-the-contour-of-the-picture#answer_235225

Lower your threshold and then call bwperim() or bwboundaries().

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Image Analyst 2016-9-24

testGrayImage.m

(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.

Veronika 2016-9-24