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evaluate diameter of moving bubbles

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emanuele teodori
emanuele teodori el 22 de Nov. de 2011
i'd like to measure the diameter of one or more moving bubbles. there's someone that already tried it? furthermore i'd like to Know the position of the center of a circular shape approximating the bubble.
  2 comentarios
Sven el 23 de Nov. de 2011
What is your question? Be specific.
Yes, I tried measuring the diameter of moving bubbles once when I was on the beach... but I don't think that helps you.
Walter Roberson
Walter Roberson el 23 de Nov. de 2011
It isn't clear to me that "diameter" of a bubble is a meaningful measurement. For example, how does one measure the "diameter" of the bubble shown at ?

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Respuestas (3)

Hin Kwan Wong
Hin Kwan Wong el 23 de Nov. de 2011
What's the acquisition device? From a 2D image or 3D model?
If you have good image processing so that the bubble is a silhouette or a 3D model
Then you can use data processing to find out the total area (for 2D) or volume (for 3D). This is then compared to the circle formula or sphere volume formula to find a equivalent diameter and translate it to real world units base on the image acquisition device

Image Analyst
Image Analyst el 23 de Nov. de 2011
Where did you post your image? You did post it somewhere before you asked here, didn't you??? Otherwise all I can say is to use image processing, or try out my BlobsDemo where I find the diameter of coins:

Sean de Wolski
Sean de Wolski el 23 de Nov. de 2011
doc regionprops
to find the center.


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