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Find intersecting points in a image

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mathru on 2 Feb 2021
Commented: mathru on 2 Feb 2021
How can I extract the boundary points of the first image. How can I plot it? How can I fiit a polynomical on the image boundary?
In the bottom image, after fitting a polynomial on the image boundary how an I find the intersecting points of the line and fitted polynomial ?

Answers (1)

KSSV on 2 Feb 2021
I = imread('myimage') ; % give your image
[y,x] = find(I==0) ; % white pixel value;
idx = boundary(x,y) ;
bnd = [x(idx) y(idx)] ; % boundary points data
Now you have boundary data points in hand. Make your line for which you want to get the intersection points with boundary. And then use
Also there are other ways to get the intersection points without using the above. Read about knnsearch.
  1 Comment
mathru on 2 Feb 2021
While running the code using your commands, getting the following error:
Index in position 2 exceeds array bounds (must not exceed 2).

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