I want to detect and determine the spheres' diameter and also the sphere inside.

Answer 1

[Shivam Lahoti]

Hi CHESSADAKORN,

As per my understanding, you wish to detect the spheres and measure their diameter; you also want to determine the spheres inside the big sphere.

MATLAB has its own Image Processing Toolbox. Various workarounds are in place to detect circles in an image.

https://in.mathworks.com/help/images/detect-and-measure-circular-objects-in-an-image.html

As in the above documentation, you shall understand the way to use “imfindcircles” function and set a sensitivity according to your needs to detect the circles. Below is a code snippet for your reference.

[centers,radii] = imfindcircles(rgb,[20 25],"ObjectPolarity","dark", ... 
    "Sensitivity",0.9) 

Running this will fetch you the centers and radii of the detected spheres.

You shall refer to this documentation to learn in detail about the function.

https://in.mathworks.com/help/images/ref/imfindcircles.html

I hope this helps.

Regards,

Shivam Lahoti.