How to crop image with nonlinear cropping shape?
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Ivan Shorokhov
le 16 Fév 2015
Commenté : Image Analyst
le 16 Fév 2015
Dear all,
I have following image:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/147156/image.jpeg)
And would like to crop it as follows:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/147157/image.jpeg)
Here is the code I'm using right now is:
clc;close all;clear all;
corn=imread('After_phi_o-phi-f.jpg');
mm_corn=imerode(corn,strel('disk',1));
bw_corn=im2bw(mm_corn, graythresh(mm_corn));
cc_corn = bwconncomp(bw_corn);
aba_corn = [cellfun(@numel,cc_corn.PixelIdxList)];
[mv_corn,ind] = sort(aba_corn,'descend');
L_corn=labelmatrix(cc_corn);
ki_corn = find(aba_corn >= mv_corn(2));
mbi_corn = ismember(L_corn, ki_corn);
bw_corn(~mbi_corn) = 0;
Ibw = imfill(bw_corn,'holes');
Ilabel = bwlabel(Ibw);
stat = regionprops(Ilabel,'centroid');
imshow(bwconvhull(im2bw(corn, graythresh(corn)))); hold on;
plot([stat(1).Centroid(1),stat(2).Centroid(1)], [stat(1).Centroid(2),stat(2).Centroid(2)], 'r');1)
And result is:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/147158/image.jpeg)
So I want cut information from the left until the red line, how I can do it?
Thanks for any help.
4 commentaires
Réponse acceptée
Image Analyst
le 16 Fév 2015
Get the horizontal and vertical profiles using sum(), and get the top and bottom row and left and right column using find()
horizontalProfile = sum(binaryImage, 1);
verticalProfile = sum(binaryImage, 2);
topRow = find(verticalProfile, 1, 'first');
bottomRow = find(verticalProfile, 1, 'last');
leftColumn= find(horizontalProfile, 1, 'first');
rightColumn = find(horizontalProfile, 1, 'last');
croppedImage = binaryImage(topRow:bottomRow, leftColumn:rightColumn);
2 commentaires
Image Analyst
le 16 Fév 2015
Is the line always red? And does it never extend to the boundaries of the blob? If so I'd suggest you extract the red line, then find the endpoints of it with bwmorph(), then draw a black line in the image using imline(), demo attached. Then extract the biggest blob, demo attached.
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