How to morphologically open a binary image ?

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Gn Gnk
Gn Gnk 2020-11-21
评论： Gn Gnk 2020-11-24
Hello , i am trying to morphologically open(to decrease the retrieved area) a binary image . However i am getting a black image (all pixels are 0) .What is wrong ?
se=strel('disk',3);
Im_open=imopen(original_binary,se);
figure;
imshow(Im_open);

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回答（2 个）

Image Analyst
Image Analyst 2020-11-21
This works just fine:
grayImage = imread('moon.tif');
subplot(2, 2, 1);
imshow(grayImage);
title('Original Gray Scale Image', 'FontSize', 15);
original_binary = imbinarize(grayImage);
subplot(2, 2, 2);
imshow(original_binary);
title('Binarized Image', 'FontSize', 15);
se=strel('disk',3, 0);
Im_open=imopen(original_binary,se);
subplot(2, 2, 3:4);
imshow(Im_open);
title('Opened Image', 'FontSize', 15);
If it doesn't for you then it's possible all your white blobs in your original image are less than 7 pixels in diameter (3 in radius). Or else your image is so big that the small things just get subsampled away for display (zoom in, in that case to see them).
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Image Analyst
Image Analyst 2020-11-23
OK, but then what that will do is to remove any blobs smaller than 3 pixels in radius, or 7 pixels in diameter.
Gn Gnk
Gn Gnk 2020-11-24
Got it ! Do you know any other function that i can use to do what i want ?For example check this binary image before and after using imopen() . This is what i want to achieve in the end.

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asd asd
asd asd 2020-11-21
Good luck with ΨΕΕ file!

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