如何平移旋转的 OpenCV 垫
我正在编写一些代码，将 OpenCV Mat 旋转指定角度。使用下面的代码，我成功地围绕其中心旋转了Mat，但是由于图像不是正方形，旋转后的图像的中心不是新图像的中心，并且图像的一部分落在了外面新马特。
Point2f src_center(source.cols/2.0F, source.rows/2.0F);
Mat rot_mat = getRotationMatrix2D(src_center, angle, 1.0);
Mat final;
final.create(calculateHeight(source.cols, source.rows, angle), calculateWidth(source.cols, source.rows, angle), CV_32FC1);
warpAffine(source, final, rot_mat, final.size());
注意：calculateHeight和calculateWidth是根据原始Mat的尺寸和旋转角度简单确定新Mat的大小的方法。
如何旋转垫子，使生成的旋转垫子在边界内居中？
I am writing some code that rotates an OpenCV Mat by a specified angle. Using the following code, I have successfully rotated the Mat around its center, but due to the fact that the image is not square, the center of the rotated image is not the center of the new image, and part of the image falls outside of the new Mat.
Point2f src_center(source.cols/2.0F, source.rows/2.0F);
Mat rot_mat = getRotationMatrix2D(src_center, angle, 1.0);
Mat final;
final.create(calculateHeight(source.cols, source.rows, angle), calculateWidth(source.cols, source.rows, angle), CV_32FC1);
warpAffine(source, final, rot_mat, final.size());
Note: calculateHeight and calculateWidth are methods that simply determine the size of the new Mat based on the dimensions of the original Mat and the angle that it is being rotated.
Example: Original image rotates to: rotated image
How do I rotate the Mat in such a way that the resulting rotated Mat is centered within the boundaries?
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只需将要旋转的图像复制到足够大的新图像的中心并旋转新图像即可。
Just copy the image you want to rotate to the center of a big enough new image and rotate the new image.