how to rotate/skew binary image by orientation angle

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Gytis Raudonius 2015-11-4

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/252800-how-to-rotate-skew-binary-image-by-orientation-angle

编辑： Gytis Raudonius 2015-11-4

volv.jpg

I work on anpr so i need to rotate number plate, so i think i need to know orientation angle. And then rotate or skew so how i can do this. Thans for answers.

warning off
img = imread('6.jpg');
img1 = rgb2gray(img);
imshow(img1);
level = graythresh(img1);
BW = im2bw(img1,level);
figure, imshow(BW);
BW1 = imclearborder(BW);
figure, imshow(BW1);
CC = bwconncomp(BW1, 8);
S = regionprops(CC, 'Area');
L = labelmatrix(CC);
P = 1500;
BW2 = ismember(L, find([S.Area] >= P));
figure, imshow(BW2);
st = regionprops(BW2, 'BoundingBox', 'Orientation' );
L = labelmatrix(CC);
for k = 1 : length(st)
    thisBB = st(k).BoundingBox;
    rectangle('Position', [thisBB(1),thisBB(2),thisBB(3),thisBB(4)],...
    'EdgeColor','r','LineWidth',2 )
    I = imcrop(BW2, thisBB);
    figure, imshow(I);
    I2 = imcrop(img, thisBB);
    figure, imshow(I2)
end