How to detect and crop boundry of the given image deleting unwanted space?

Question

Indunie Florence 2014-5-31

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/131926-how-to-detect-and-crop-boundry-of-the-given-image-deleting-unwanted-space

评论： Ali Haider 2016-2-22

采纳的回答： Image Analyst

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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".

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

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Indunie Florence 2014-6-1

no, It doesn't crop above image correctly. Actually above code is a testing code for cropping. Your code is working to the given image by me. It is a very clear card. According to my target I use images with some noises. After some functions worked, it produces a image without boundary. I want to crop it too. Your code didn't work in this situation.

Can you help me.Image is given below. It is in binary mode.

Image Analyst 2014-6-1

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.

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