使用python从opencv cascade中获取特定的图像截面

import cv2

cascade_path = 'path_to_cascade_file.xml'
cascade = cv2.CascadeClassifier(cascade_path)

image_path = 'path_to_image.jpg'
image = cv2.imread(image_path)

gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)

objects = cascade.detectMultiScale(gray, scaleFactor=1.1, minNeighbors=5, minSize=(30, 30))

for (x, y, w, h) in objects:
    roi = image[y:y+h, x:x+w]
    cv2.imshow('ROI', roi)
    cv2.waitKey(0)