What the problem with this code of cropping image ?

Question

M.aM 2012-7-26

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https://ww2.mathworks.cn/matlabcentral/answers/44617-what-the-problem-with-this-code-of-cropping-image

Hi all

I have apply this code to crop my images in any sizes

B = imread('bar5.jpg');
B = imresize(B,0.33); 
B2 = im2bw(B1); 
stat = regionprops(I,'area'); 
C(1:length(stat)) = stat(1:end).Area; 
m = max(C); 
J = bwareaopen(I,m); 
imshow(J);

and I got this message

??? Undefined function or variable 'I'.

so any ideas

sorry I'm new in matlab

I want learning

Thanks

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Answer 1

Walter Roberson 2012-7-26

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https://ww2.mathworks.cn/matlabcentral/answers/44617-what-the-problem-with-this-code-of-cropping-image#answer_54690

在 MATLAB Online 中打开

After the line

B2 = im2bw(B1);

add the line

I = B2;

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Answer 2

M.aM 2012-7-26

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https://ww2.mathworks.cn/matlabcentral/answers/44617-what-the-problem-with-this-code-of-cropping-image#answer_54694

Thank you Walter but why it did not cropped image do you know? should I put the size of image ??? but I need it to apply for unknown image Thanks once again

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Ryan 2012-7-27

编辑：Ryan 2012-7-27

There is nothing in the code to suggest the image was cropped in any way, just resized.

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Answer 3

Image Analyst 2012-7-27

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https://ww2.mathworks.cn/matlabcentral/answers/44617-what-the-problem-with-this-code-of-cropping-image#answer_54750

在 MATLAB Online 中打开

You can do this:

stat = regionprops(B2,'area'); 
allAreas = [stat.Area]; 
maxAreas = max(allAreas);

You didn't do any cropping (perhaps you meant "size filtering" instead). You just took your image and threw away all the objects smaller than the largest object by using bwareaopen(). In other words, you threw EVERYTHING away.