How can I extract and highlight the white portion of an image?

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Asher Zaidi 2018-6-21

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https://ww2.mathworks.cn/matlabcentral/answers/406774-how-can-i-extract-and-highlight-the-white-portion-of-an-image

关闭： Asher Zaidi 2018-6-21

untitled2.png

How can I extract the white portion of an image (see attached), or delete the black portion so that I have only the holes in the original image left? Also, how can I fill them in so I am able to see them?

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Answer 1

Mark Saad 2018-6-21

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https://ww2.mathworks.cn/matlabcentral/answers/406774-how-can-i-extract-and-highlight-the-white-portion-of-an-image#answer_325664

编辑：Mark Saad 2018-6-21

在 MATLAB Online 中打开

You can try this link: https://www.mathworks.com/discovery/edge-detection.html

and this video: https://www.mathworks.com/videos/edge-detection-with-matlab-119353.html

Or since your image is purely black and white, you can try this:

img = imread('yourimage.png');
subplot(1,2,1);
imshow(img);
img = imcomplement(img);
subplot(1,2,2);
imshow(img)

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Asher Zaidi 2018-6-21

编辑：Asher Zaidi 2018-6-21

I'm sorry my question was unclear. I was hoping to select the white foreground of the image so that I can delete the background I wanted to overlay it on top of the original image.