How to find out area under the curved shape of the attached figure?

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Debasish Sarker 2023-12-15

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https://ww2.mathworks.cn/matlabcentral/answers/2061137-how-to-find-out-area-under-the-curved-shape-of-the-attached-figure

评论： Image Analyst 2023-12-16

采纳的回答： Image Analyst

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Answer 1

Image Analyst 2023-12-16

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https://ww2.mathworks.cn/matlabcentral/answers/2061137-how-to-find-out-area-under-the-curved-shape-of-the-attached-figure#answer_1372642

Try the attached code to automatically find the lower dark shape. It produces.

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Debasish Sarker 2023-12-16

I managed to solve the problems using help from your code, though threshold limit is manually selected. Thanks again!

Image Analyst 2023-12-16

If you have a variety of intensity levels, then that's not good. You should try to adjust your image capture parameters to get consistent exposure. If you can't do that then you'll have to come up with some algorithm to automatically threshold. Like maybe you can find the mean of the image, and then multiply by a factor so that the mean of a new image will be some known value, like 100. Then you could use the fixed threshold. Otherwise you'll have to do some tricky examination of the shape of the histogram and coms up with some way to find the threshold from that.

The imclearborder I used is available only in r2023b. If you can upgrade, do it. Otherwise you'll have to do some tricky operations with bwselect and imclearborder to remove the blob on the right, left, and top sides.

Doing medfilt2 before or after the thresholding is something I wondered about. Not sure which might be better. I just tried it on the grayscale image and it seemed to work fine, so I left it there. You can put it right after the initial mask creation and see if it's any better there.

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