在MATLAB中围绕一个点裁剪感兴趣的圆形区域 [英] Cropping Circular region of interest around a point in MATLAB

问题描述

我有一张图片，我想在一个点周围裁剪感兴趣的圆形区域.我在MATLAB中做了以下操作:

I have an image and I want to crop the circular region of interest around a point. I did following in MATLAB:

  vessel=imread('vessel.jpg');
  imshow( vessel)
  t = 0:pi/20:2*pi;
  xc=230; % point around which I want to extract/crop image
  yc=79;
  r=20;   %Radium of circular region of interest
  xcc = r*cos(t)+xc;
   ycc =  r*sin(t)+yc;
   roimaskcc = poly2mask(double(xcc),double(ycc), size(vessel,1),size(vessel,2));
   pr_gccc = find(roimaskcc);
   roimean_cc= mean(vessel(pr_gccc));
  figure, imshow(roimaskcc)

roimaskcc是正确的，但是当我执行以下操作时，它给出的是nX1矩阵，而不是蒙版下的感兴趣区域:

roimaskcc is correct but when I do the following it gives in nX1 matrix but not the region of interest under mask:

  vessel_undermask=vessel(roimaskcc==1);

任何人都可以.帮助提取感兴趣点(xc，yc)周围的圆形感兴趣区域. 谢谢

Can anybody pls. help to extract the circular region of interest around point of interest (xc, yc). Thanks

推荐答案

是的.我做了这样的事情:

Yes I got it. I did something like that:

           vesseltry=vessel;
          vesseltry(~roimaskcc)=0;

现在，vesseltry是我的新图像，具有感兴趣的圆形区域...

vesseltry is now my new image with circular region of interest...

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