How to create multiple ROI in the same figure? I'd like to manually draw multiple region on an image to create a mask of the drawn regions. I attached the code to do it using ellipse that does the job for 5 region, but only last region is displayed.

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Mei Synn Tan 2017-1-24

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https://ww2.mathworks.cn/matlabcentral/answers/321684-how-to-create-multiple-roi-in-the-same-figure-i-d-like-to-manually-draw-multiple-region-on-an-imag

评论： Meera chandran 2018-8-31

I = imread('13170.jpg');
im = imshow(I);
e = imellipse(gca);% now pick ROI
BW = createMask(e,im);% get BW mask for that ROI
BW(:,:,2) = BW;
BW(:,:,3) = BW(:,:,1);
ROI = I;
ROI(BW == 0) = 255;
figure, imshow(ROI,'Border','tight');

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KSSV 2017-1-24

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编辑：KSSV 2017-1-24

You put a loop and call the code the number of times you want. Just call it multiple times and save all the regions.

Refer this file exchange, may be useful: https://in.mathworks.com/matlabcentral/fileexchange/31388-multi-roi-mask-editor-class

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KSSV 2017-1-24

在 MATLAB Online 中打开

clc; clear all;
N = 5 ;
I = imread('junk.jpg');
iwant = cell(N,1) ;
for i = 1:N
    im = imshow(I);
    e = imellipse(gca);% now pick ROI
    setColor(e, 'red');
    % position = wait(e);
    BW = createMask(e,im);% get BW mask for that ROI
    BW(:,:,2) = BW;
    BW(:,:,3) = BW(:,:,1);
    ROI = I;
    ROI(BW == 0) = 255;
    iwant{i} = ROI ;
end
for i = 1:N
    figure
    imshow(iwant{i},'Border','tight');
end