How to detect and crop boundry of the given image deleting unwanted space?
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Indunie Florence
on 31 May 2014
Commented: Ali Haider
on 22 Feb 2016
I want to crop the "Capture.JPG" image from "1.jpg"(left image=>right image)
I used the imcrop but it doesn't gave me the desired image.
My code is given below. Code requires two folders "Testing Images" and "Preprocess Testing Images".
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/163579/image.jpeg)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/163580/image.jpeg)
code :-
Imges = dir('Testing Images\*jpg');
InputSet=[];
OutputSet=[];
for i = 1:numel(Imges)
filename = strcat('Testing Images\',Imges(i).name);
I=imread(filename);
Igray = rgb2gray(I);
imwrite(Igray,strcat('Preprocessed Testing Images\GrayScale',int2str(i),'.jpg'));
Ibw = im2bw(Igray,graythresh(Igray));
imwrite(Ibw,strcat('Preprocessed Testing Images\Binary',int2str(i),'.jpg'));
Ibwn=wiener2(Ibw,[5 5]);
imwrite(Ibwn,strcat('Preprocessed Testing Images\AfterNoise',int2str(i),'.jpg'));
Iedge = edge(Ibwn,'canny');
imwrite(Iedge,strcat('Preprocessed Testing Images\AfterEdge()',int2str(i),'.jpg'));
se = strel('arbitrary',2);
Iedge2 = imdilate(Iedge, se);
imwrite(Iedge2,strcat('Preprocessed Testing Images\AfterImdilate()',int2str(i),'.jpg'));
Ifill= imfill(Iedge2,'holes');
imwrite(Ifill,strcat('Preprocessed Testing Images\AfterImfill()',int2str(i),'.jpg'));
IfillInvert=imcomplement(Ifill);
imwrite(IfillInvert,strcat('Preprocessed Testing Images\AfterImInvert()',int2str(i),'.jpg'));
Ifinal1 = bwareaopen(IfillInvert,100);
[Ilabel num] = bwlabel(Ifinal1);
Iprops = regionprops(Ilabel);
Ibox = [Iprops.BoundingBox];
Icrop = imcrop(I,Ibox);
imwrite(Icrop,strcat('Preprocessed Testing Images\AfterCrop1()',int2str(i),'.jpg'));
end
7 Comments
Image Analyst
on 1 Jun 2014
It's a different card so will require a different algorithm. Since it's not a green box, you need to invert the image, then call bwconvhull(), then bwlabeland regionprops, finally imcrop. Give it a try.
Accepted Answer
Image Analyst
on 31 May 2014
Try the attached test.m file to produce this image.
![](https://www.mathworks.com/matlabcentral/images/broken_image.png)
1 Comment
Ali Haider
on 22 Feb 2016
Hi,
I want to crop text in bounding box from an image. plz help me out in this.
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