problem of take out ROI while use Superpixels

Question

hajer jon 2019-10-23

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https://ww2.mathworks.cn/matlabcentral/answers/487102-problem-of-take-out-roi-while-use-superpixels

评论： Uma Sharma 2022-7-14

Hi

i wrote code that select ROI then devide image to patches then appaly superpixels but the superpixels results show that non ROI is calcute superpixels on it how can i let not take the non ROI while counting???

I3=read(v,1);

BW = roipoly(I3);

for t=1:4

imca=im2patch{t}

figure;imshow(imca);

t=t+1;

[Lce,N] = superpixels(imca,500);

BWL1 = boundarymask(Lce);

masimg1=imoverlay(imca,BWL1);

figure;imshow(masimg1);

end;

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Answer 1

Subhadeep Koley 2020-1-10

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Hi, you are getting such output because you are applying super-pixel over segmentation on the whole image. You can use the function roifilt2 to apply your filtering only to the ROI. Refer the code below.

I = imread('peppers.png');
BW = roipoly(I);
imshow(BW);
% Create function handle
f = @(x)superpixels(x,500);
% Apply 2-D superpixel oversegmentation on the ROI
if size(I, 3) == 3
    J = roifilt2(rgb2gray(I), BW, f);
else
    J = roifilt2(I, BW, f);
end
% Create the mask
mask = boundarymask(J, 8);
% Overlay the mask above the image
figure;imshow(labeloverlay(I, mask, 'Transparency', 0.3, 'Colormap', 'parula'));

Hope this helps!

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Uma Sharma 2022-7-14

Hi,

This response was very helpful! Using the function handle, how can I get the label and numIterations data from the superpixel function for the superpixels in the ROI? Please let me know if there are any solutions to this.

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