How can I crop image 1.jpg from 2.jpg in matlab(if it doesn't have boundary)?

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Indunie Florence 2014-6-1

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评论： Indunie Florence 2014-6-1

How can I crop image 1.jpg from 2.jpg in matlab? Is there any function? 1.jpg is a binary image and it hasn't a boundary and noice. I use blue color for white color here to understandable.

1.jpg

2.jpg

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Answer 1

Image Analyst 2014-6-1

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https://ww2.mathworks.cn/matlabcentral/answers/132000-how-can-i-crop-image-1-jpg-from-2-jpg-in-matlab-if-it-doesn-t-have-boundary#answer_139060

Here are the steps (one way at least - there are several ways to do it).

convert to gray with rgb2gray()
threshold binaryImage = grayImage < 128
call bwconvhull
call bwlabel to get labeledImage
call regionprops(labeledImage..... and ask for 'BoundingBox'.
expand bounding box coordinates by whatever amount you want.
call imcrop(originalImage, boundingBox)

That pretty much does it, except for some things like imshow() to display your progress. See if you can do it all by yourself from this point on. Let me know how it goes.

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Indunie Florence 2014-6-1

编辑：Indunie Florence 2014-6-1

在 MATLAB Online 中打开

   [Ilabel num] = bwlabel(Ifinal1);
    Iprops = regionprops(Ilabel);
    Ibox = [Iprops.BoundingBox];      
    Icrop = imcrop(I,Ibox);
I used this code segment and it doesn't work.
I can't set the boundary mannually because I don't know where the objects are in the image.