how to rotate/skew binary image by orientation angle

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Gytis Raudonius
Gytis Raudonius 2015-11-4
编辑： Gytis Raudonius 2015-11-4
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
so i think i have orientation angle but i dont know how to use it by rotate.

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