how to rotate/skew binary image by orientation angle

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.