import cv2 import numpy as np import matplotlib.pyplot as plt # 生成一个空灰度图像 img1 = np.zeros((400, 400), np.uint8) img1 = cv2.line(img1, (0, 0), (400, 400), 255, 5) # 生成一个空彩色图像 img3 = np.zeros((400, 400, 3), np.uint8) img3 = cv2.line(img3, (0...