How can I have different ROIs (Region Of Interest) in a image using imellipse?

Question

azim 2015-12-15

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/260348-how-can-i-have-different-rois-region-of-interest-in-a-image-using-imellipse

评论： azim 2015-12-16

采纳的回答： harjeet singh

I am making a GUI in Matlab to show an image and select a ROI on it. Please see the following code:

clear all

close all

clc

a=imread('rice.png');

I=imshow (a);

e = imellipse(gca,[]);

BW = createMask(e,I);

ROI = a;

ROI(BW == 0) = 0;

figure,imshow (ROI);

Now, I want have different ROIs from the first image (rice.png), by dragging and resizing the ROI on the image and without running the code again. Could you please help me in this regard? Thank you very much

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Image Analyst 2015-12-15

Do you want multiple ellipse ROIs on the image simultaneously, or do you just want to use one ellipse at a time?

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Answer 1

harjeet singh 2015-12-15

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/260348-how-can-i-have-different-rois-region-of-interest-in-a-image-using-imellipse#answer_203336

在 MATLAB Online 中打开

hello azim

this code will help you, do change for for loop for the number of iterations you want

clear all
close all
clc
a=imread('rice.png');
figure(1)
I=imshow(a);
drawnow
ROI_main(1:size(a,1),1:size(a,2))=0;
ROI_main=uint8(ROI_main);
for i=1:5
    e = imellipse(gca,[]);
      BW = createMask(e,I);
      ROI = a;
      ROI(BW == 0) = 0;
      ROI_main=(ROI_main .* uint8(~BW)) + ROI;
      figure(2)
      imshow (ROI_main);
      drawnow
      figure(1)
  end
  figure(2)