How to crop out the barcode??

Question

Kim 2012-2-11

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/28754-how-to-crop-out-the-barcode

评论： Daniel Purba 2020-7-27

I have found out the way to determine the barcode and currently working on cropping out the barcode. How can I write the code so that it can crop out the barcode?? I have paste my original image and my coding below.

Original Image

Processed Image

% Read Image
rgb = imread('barcode.jpg');
% Resize Image
rgb = imresize(rgb,0.33);
%figure(),imshow(rgb);
% Convert from RGB to Gray
Igray = rgb2gray(rgb);
BW2 = edge(Igray,'canny');
%figure(),imshow(BW2);
% Perform the Hough transform
[H, theta, rho] = hough(BW2);
 % Find the peak pt in the Hough transform
peak = houghpeaks(H);
 % Find the angle of the bars
barAngle = theta(peak(2));
J = imrotate(rgb,barAngle,'bilinear','crop');
%figure(),imshow(J);
Jgray = double(rgb2gray(J));
% Calculate the Gradients
[dIx, dIy] = gradient(Jgray);
%if min(dIx(:))<= -100 && max(dIx(:))>=100 || min(dIy(:))<=-100 && max(dIy(:))>=100
if barAngle <= 65 && barAngle >=-65 && min(dIx(:))<= -100
    B =  abs(dIx) - abs(dIy);
else
    B = abs(dIy) - abs(dIx);
end
% Low-Pass Filtering
H = fspecial('gaussian', 20, 10);
C = imfilter(B, H);
C = imclearborder(C);
%figure(),imshow(C);
figure(),imagesc(C);colorbar;

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Answer 1

Chandra Kurniawan 2012-2-12

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https://ww2.mathworks.cn/matlabcentral/answers/28754-how-to-crop-out-the-barcode#answer_37137

在 MATLAB Online 中打开

D = C > 20;
Ilabel = bwlabel(D);
stat = regionprops(Ilabel,'boundingbox');
for x = 1 : length(stat)
    Icrop{x} = imcrop(J,stat(x).BoundingBox);
end

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Daniel Purba 2020-7-27

Mas Chandra, saya menggunakan Code seperti diatas untuk cropping, hanya saja terkendala harus memilih mana cropping image yang mengandung barcode. Apakah ada code khusus untuk langsung mendapatkan cropped image yang mengandung barcode? Terimakasih.

Chandra, I tried the code you gave, the obstacle is we still have to choose a region that contains a barcode. Is there a way that directly displays a cropped image that contains a barcode? Thanks.

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Answer 2

Image Analyst 2012-2-11

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/28754-how-to-crop-out-the-barcode#answer_37092

Looks like thresholding at about 20 should do it. Then label and use regionprops to do size filtering and get the bounding box. Then use imcrop to do the cropping.