# how can i automatically crop this image? if it is possible.

조회 수: 2 (최근 30일)
SvenvdB 2021년 6월 29일
댓글: Walter Roberson 2021년 6월 29일
I have a script that automatically calculates de surface area of a shape. The problem is i have to manually crop a the images.
Does anyone know if this i possible to do. and tips on how to do it.
This is an example of the picture i want to crop.
i want to crop it like this:
this i my code for calculating surface area:
imshow(i);
%%Convert RGB to Gray
imshow(gry,[]);
%%Image segementation by thresholding
level=0.7;
thres=im2bw(gry,level);
imshow(thres);
%sort image
format long g
props = regionprops(~thres, 'Area');
sA = sort([props.Area])
mA = min(sA(1:end-1))
relA = sA(end)/mA
small_area = 10*10;
absA = relA * small_area
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Walter Roberson 2021년 6월 29일
I knew that looked familiar ;-)

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### 채택된 답변

Joseph Cheng 2021년 6월 29일
well, you can find the corner squares by doing the following:
figure(1),subplot(221),imshow(img);
%%Convert RGB to Gray
%find corner squares;
[rgion] = find(rsum~=0);
[cgion] = find(csum~=0);
subplot(224),imshow(img(rgion(1):rgion(end),cgion(1):cgion(end),:))
the area in the bwareafilt was selected from your calculation of the regionprops. similarly with the region props you can find the centroid of these corner markers and perform a rotation if you need to morph the image.
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SvenvdB 2021년 6월 29일
Thank you. the cropped image that is output. what is the name of that? like how to i continue with that image. when i try right now it grabs the uncropped image. hope it makes sense, i am not that experienced with matlab so sorry in advance.
Joseph Cheng 2021년 6월 29일
it can be whatever you want it to be. if you follow the step by step code you can see that i find the extremes/bounds of the cropped image by the defined rgion and cgion (row and column regions):
Croppedimg = img(rgion(1):rgion(end),cgion(1):cgion(end),:);
so you can save the original image in a variable by specifying the indexes of the original image

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