Measuring dimensions and contact angle

Question

Shri Harsha Bharadwaj 2021-3-16

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/774962-measuring-dimensions-and-contact-angle

回答： Gargi Patil 2021-3-23

Hello,

I have an image of a droplet on a plane surface and I am trying to measure its height and diameter. I know it has something to do with pixels and resolution of the camera, but I am not too sure as to how to do it.

Also, if I can draw lines as highlighted, how would I measure the contact angle?

Any help will be much appreciated as I do not have much experience with the software.

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Matt J 2021-3-16

Has the camera been calibrated? Why do the edges of the plane surface look curved?

Shri Harsha Bharadwaj 2021-3-17

Hello @Matt J,

Thanks for the reply sir. You are right, I am still working on getting better images.

But, if you could help me determine the contact angle and height of diameter of the droplet, that would be very very helpful.

I looked up a couple of posts about contact angle on this forum, but could not get anything concrete.

Thanks for the help again.

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Answer 1

Gargi Patil 2021-3-23

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/774962-measuring-dimensions-and-contact-angle#answer_655787

If I've understood correctly, you would like to measure the dimensions and contact angle of an object in a given image. There is a similar question about finding the size of an object in an image which has been answered. You can refer to it as a starting point:

https://www.mathworks.com/matlabcentral/answers/59401-how-to-determine-the-size-of-the-object-using-image-processing

Furthermore, to determine the contact angle you can refer to the following documentation which explains how to measure the angle of intersection in an image:

https://www.mathworks.com/help/images/measuring-angle-of-intersection.html