Hi,

I got some trouble with rotating the bounding box of object detection.

I have an source image and a bounding box (xmin, ymin, xmax, ymax) of the object, and I rotate the image around its center by an angle WITHOUT cutting off the edge:

```
def rotate_image(mat, angle):
# angle in degrees
height, width = mat.shape[:2]
image_center = (width / 2, height / 2)
rotation_mat = cv2.getRotationMatrix2D(image_center, angle, 1.)
abs_cos = abs(rotation_mat[0, 0])
abs_sin = abs(rotation_mat[0, 1])
bound_w = int(height * abs_sin + width * abs_cos)
bound_h = int(height * abs_cos + width * abs_sin)
rotation_mat[0, 2] += bound_w / 2 - image_center[0]
rotation_mat[1, 2] += bound_h / 2 - image_center[1]
rotated_mat = cv2.warpAffine(mat, rotation_mat, (bound_w, bound_h))
return rotated_mat
```

I want to rotate the bounding box by the same degree and crop it out. How can i do that? Many thanks.

Best,