cv2.rotatedrectangleintersecti

on function is used to calculate the intersection area between two rotated rectangles. The function is called `cv2.rotatedRectangleIntersection(rect1, rect2)`. It takes two parameters, `rect1` and `rect2`, which represent the rotated rectangles.

Here is an example usage of the function:

import cv2
import numpy as np

# Define the rotated rectangles
rect1 = ((100, 100), (200, 100), 30)
rect2 = ((150, 150), (100, 200), 45)

# Calculate the intersection area
intersection = cv2.rotatedRectangleIntersection(rect1, rect2)

# Check if there is an intersection
if intersection[0] == cv2.INTERSECT_NONE:
    print("No intersection between the rectangles.")
elif intersection[0] == cv2.INTERSECT_PARTIAL:
    print("Partial intersection between the rectangles.")
elif intersection[0] == cv2.INTERSECT_FULL:
    print("Full intersection between the rectangles.")

# If there is an intersection, retrieve the intersection rectangle
if intersection[0] != cv2.INTERSECT_NONE:
    intersection_rect = cv2.boxPoints(intersection[1])
    intersection_rect = np.int0(intersection_rect)

In this example, `rect1` and `rect2` are defined as tuples representing the center coordinates, size (width and height), and rotation angle of each rectangle. The function returns a tuple with two elements. The first element represents the type of intersection (`INTERSECT_NONE`, `INTERSECT_PARTIAL`, or `INTERSECT_FULL`), and the second element is the intersection rectangle if there is an intersection.

Note that this function requires OpenCV library to be installed on your machine.