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roipoly with a specified area

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alessio
alessio 2011-7-18
关闭： MATLAB Answer Bot 2021-8-20
Hi there, I am interested in specifiying a region of interest in an image, with a specified area A. A possibility is maybe to modify the roipoly function, but I don't know how to do it quickly.
I am quite new and I don't know if in matlab there are similar functionalities...
Thanks to all
Alessio

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回答（2 个）

Nuno
Nuno 2011-7-18
You can use this sintaxe:
frame(y1(1):y1(2),x1(1):x1(2),:);
With this, you specify 4 points...
  1 个评论
alessio
alessio 2011-7-19
Thank you very much for your reply Nuno, but I was interested in something more interactive, without having to specify in advance the coordinates... Like a roipoly with a forcing on the spanned area
Alessio
Sean de Wolski
Sean de Wolski 2011-7-18
How about poly2mask?
doc poly2mask
  2 个评论
alessio
alessio 2011-7-19
Thank you Sean de, I tried with poly2mask but what I need is an interactive way to specify the roi like polyroi, that at the same time force the area to a fixed value... I'm not sure if it is possible without rewriting some code...
Alessio
Sean de Wolski
Sean de Wolski 2011-7-19
Well, yes you'll probably have to write some code. But you can easily and quickly generate masks of a non-convex area with poly2mask, and then sum it or use bwarea to get its area, and then dilate it or erode it automatically if too big or too small.

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