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Find intersecting points in a image

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mathru
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
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 https://in.mathworks.com/matlabcentral/fileexchange/22441-curve-intersections
Also there are other ways to get the intersection points without using the above. Read about knnsearch.
  1 Comment
mathru
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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