如何通过Python获取立体相机镜头长度属性？

import cv2
import numpy as np

left_image = cv2.imread('left_image.jpg', 0)
right_image = cv2.imread('right_image.jpg', 0)

min_disparity = 16
num_disparities = 112
block_size = 5

stereo = cv2.StereoBM_create(numDisparities=num_disparities, blockSize=block_size)
disparity = stereo.compute(left_image, right_image)

focal_length = 0.8 * num_disparities * block_size

import cv2
import numpy as np

left_image = cv2.imread('left_image.jpg', 0)
right_image = cv2.imread('right_image.jpg', 0)

min_disparity = 16
num_disparities = 112
block_size = 5

stereo = cv2.StereoBM_create(numDisparities=num_disparities, blockSize=block_size)
disparity = stereo.compute(left_image, right_image)

focal_length = 0.8 * num_disparities * block_size

print("立体相机镜头长度属性：", focal_length)