如何基于有效的OpenCV代码在iPhone应用程序的opencvWrapper文件中创建Python函数findcontour

import cv2
import numpy as np

def findcontour(image_data):
    # Convert image to grayscale
    gray = cv2.cvtColor(image_data, cv2.COLOR_BGR2GRAY)

    # Apply thresholding to obtain binary image
    ret, thresh = cv2.threshold(gray, 127, 255, cv2.THRESH_BINARY)

    # Find contours in the binary image
    contours, hierarchy = cv2.findContours(thresh, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)

    # Draw contours on the original image
    result = cv2.drawContours(image_data, contours, -1, (0, 255, 0), 2)

    # Return the contours data structure
    return contours