Info

此问题已关闭。 请重新打开它进行编辑或回答。

roipoly with a specified area

3 次查看（过去 30 天）
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

此问题已关闭。

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.

此问题已关闭。

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by