- OpenCV Tutorial, Image Rotation: Here, a blank image is created. Then, it is filled by two rectangles using rectangle function. Next, the image is interactively rotated by changing the angle of rotation with a trackBar created by createTrackbar. Functions getRotationMatrix2D and warpAffine are used to implement the rotation around the center of the image.
Figure 1: A snapshot of image rotation by angle 30.
- OpenCV Tutorial, Minimum Area Rectangle: Using function cv2.minAreaRect, we find the boundign rectangle with minimum area for a set of poits. Here, points of a text are used. By pressing any key, the text image is randomly rotated. Then, we draw the computed minimum area rectangle over the image.
Figure 2: A snapshot of the rotated text image and its bounding rectangle.
