How to detect corner points automatically in images ?

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I have a series of images (as the figure below shows three images) where I need to get the base length of a semicircular type shape as shown in the bottom two images. I think, for this, I need to detect two corner points (at left and right as shown in the top most image) in each image. Is there any way to detect these points automatically? Here, I have attached these three images too.

Accepted Answer

Image Analyst
Image Analyst on 7 Jun 2021
What you should do is to find the black boundary down to a few lines above the bottom of the image (the baseline). Then fit the coordinates to an ellipse -- see attached demo. Then evaluate the ellipse at the baseline to get the coordinates and the contact angle.
Alternatively you could use findchangepts() on the y coordinate to try to find the corners.

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