How to display all selected region in the one figure?

Question

Mei Synn Tan 2017-1-25

1
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/321840-how-to-display-all-selected-region-in-the-one-figure

评论： Takuji Fukumoto 2017-2-7

N = 5 ;
I = imread('13170.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

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Answer 1

Takuji Fukumoto 2017-1-25

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链接

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https://ww2.mathworks.cn/matlabcentral/answers/321840-how-to-display-all-selected-region-in-the-one-figure#answer_251932

在 MATLAB Online 中打开

Here is a sample using subplot.

figure,
for i = 1:N
    subplot(2,3,i),imshow(iwant{i});
end

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Mei Synn Tan 2017-2-4

编辑：Mei Synn Tan 2017-2-4

在 MATLAB Online 中打开

Dear Takuji Fukumoto, here it is. the result showing the content of selected part is not clear, how to avoid it? how to avoid it? Thanks and have a nice day.

N = 2 ;
I = imread('13100.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
Iout = uint8(zeros(364,236,3));
    for i = 1:N
        I= iwant{i};
        idx= (I == 255);
        I(idx) = 0;
        Iout= Iout + I;
    end
Iout(Iout == 0) = 255;
figure,imshow(Iout,'Border','tight');

Takuji Fukumoto 2017-2-7

Is the answer from Image Analyst acceptable for you? If you need more help, let me know.

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Answer 2

Image Analyst 2017-2-4

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/321840-how-to-display-all-selected-region-in-the-one-figure#answer_253331

mask_multiple_ellipses.m

Mei, try the attached for a more memory efficient way of doing it. Don't be afraid, there are actually fewer lines than you and Takuja were using if you boil it down to the essentials. It's just longer because I put in tons of comments and some fancy display stuff to show your progress while drawing. I just mask the image at the end with the final mask. If you want, you can get updated images in the lower right that update after every ellipse so it would show 1 ellipse, then 2, then 3, etc.

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Answer 3

Image Analyst 2017-2-4

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/321840-how-to-display-all-selected-region-in-the-one-figure#answer_253310

copy_paste_image_freehand.m

Takuji: Don't make iwant a cell array. Make it your final image. Just paste in the ellipses from the source image. Adapt my attached copy and paste demo.

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Mei Synn Tan 2017-2-4

Thank for answer my question. Hope Takuji Fukumoto can help me. Thanks and have a nice day

Image Analyst 2017-2-4

编辑：Image Analyst 2017-2-4

Does that mean that you don't want me to help? I have a much better way than you or Takuja - I just didn't have time yesterday. It's in my second answer - look for it if you're interested.

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