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

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Kim
Kim 2012-2-2
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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采纳的回答

Razvan
Razvan 2012-2-2
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');
  2 个评论
Kim
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
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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