Trying to automatically crop an image into several smaller images based on segmentation

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Teshan Rezel 2020-2-17

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https://ww2.mathworks.cn/matlabcentral/answers/505912-trying-to-automatically-crop-an-image-into-several-smaller-images-based-on-segmentation

评论： Teshan Rezel 2020-2-18

采纳的回答： darova

Hi all,

Apologies in advance, I'm not well versed in Matlab.

I'm trying to crop a segmented image into several smaller pieces that only contain the a segmented piece of the original image. For example, if an image has 3 apples and I'm interested in the apples, I am aiming to cut out each apple into a seperate image. The result I'm hoping for is 3 seperate images of apples, with anything else in the crop blackened (or whitened) out.

Why I'm trying to do this is so I can pass each resultant image into a CNN for analysis, as each segmented piece/cropped image is a type of object that needs to be classified.

Below is an image of mine that I'm trying to process. Any ideas would be useful! Thanks in advance.

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darova 2020-2-17

Can you plot/draw green pixels (contours/boundaries) on clear image?

Teshan Rezel 2020-2-17

sure thing, the BW mesh is attached

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darova 2020-2-17

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https://ww2.mathworks.cn/matlabcentral/answers/505912-trying-to-automatically-crop-an-image-into-several-smaller-images-based-on-segmentation#answer_415972

在 MATLAB Online 中打开

Something like this

clc,clear
I = imread('image.jpeg');
I1 = im2bw(I);
I2 = imdilate(I1,ones(5));      % imdilate to close contours
I3 = imerode(I2,ones(4));       % restore thickness
[L,n] = bwlabel(I3);            % label regions/areas
subplot(121)
imshow(I2)
title('imdilate')
subplot(122)
imshow(I3)
title('restore thickness of contours')
figure
for i = 2:n
    I4 = L==i;                      % select region
    I5 = imfill(I4,'holes');        % fill contour/region
    imshow(cat(3,I5*255,I3*255,I3*0))   % display
    pause(1)
end

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darova 2020-2-17

在 MATLAB Online 中打开

Sure. Try this:

I4 = L==i;                      % select region
I5 = imfill(I4,'holes');        % fill contour/region
I6 = I.*repmat(uint8(I4),[1 1 3]);
imshow(I6)                      % display cropped region