python怎么把背景换成黑色

import cv2

image = cv2.imread('image.jpg')  # 替换为图像文件路径

black_background = np.zeros_like(image)  # 创建与图像大小相同的黑色背景

# 分离前景thresh = cv2.threshold(image, 128, 255, cv2.THRESH_BINARY)[1]contours, _ = cv2.findContours(thresh, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)# 绘制前景到黑色背景上cv2.drawContours(black_background, contours, -1, (255, 255, 255), -1)

cv2.imwrite('image_black_background.jpg', black_background)  # 替换为结果图像文件路径