Find the intersecting points

How can I calculate the intersecting points (red circled) from the following image?

[Ajay Kumar]

How is this plot formed? Could you help with the code?

[mathru]

This is not a plot. This is an image ( just an trapezoidal shape object kept on a flat surface).

Answer 1

[KSSV]

If you have the image in hand.

1. Get the locations/ positions i.e (x,y) for both the regions using logical indexing.
2. Get the boundary of both the regions using boundary.
3. Use InterX from the link: https://in.mathworks.com/matlabcentral/fileexchange/22441-curve-intersections?focused=5165138&tab=function

If you have points (x,y) straight away follow from step 2 in the above.