How to rotate the image so that the barcode horizontal??

Question

Kim 2012-2-2

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https://ww2.mathworks.cn/matlabcentral/answers/27782-how-to-rotate-the-image-so-that-the-barcode-horizontal

How can I rotate the image using the barcode to determine where the angle is and rotate it according to make it horizontal. I used `Hough Transform` but I can only rotate slightly to the right.

     rgb = imread('barcode10.jpg');
      % Resize Image
      rgb = imresize(rgb,0.33);
      figure(),imshow(rgb);
      % Convert from RGB to Gray
      Igray = double(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);

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Answer 1

Razvan 2012-2-2

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https://ww2.mathworks.cn/matlabcentral/answers/27782-how-to-rotate-the-image-so-that-the-barcode-horizontal#answer_36053

在 MATLAB Online 中打开

J = imrotate(rgb,90 + barAngle,'bilinear','crop'); seems to give the right result. I think it depends if the Hough transform detects a horizontal line or a vertical line. So one of these should rotate the image as you like:

J = imrotate(rgb,barAngle,'bilinear','crop');

or

J = imrotate(rgb,90 + barAngle,'bilinear','crop');

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Kim 2012-2-2

But how can I make the barcode become horizontal no matter what image I insert whether is it vertical or horizontal.

Anton Semechko 2012-2-2

there is too much clutter in the background ... Did you check if the bin with the highest vote actually corresponds to the orientation of the barcode lines?

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