使用Opencv和Python从四个角点裁剪图像

import cv2
import numpy as np

image = cv2.imread('image.jpg')
cv2.imshow('Original Image', image)
cv2.waitKey(0)

# 定义四个角点的坐标（顺时针或逆时针）
points = np.array([(x1, y1), (x2, y2), (x3, y3), (x4, y4)], dtype=np.float32)

width = max(np.linalg.norm(points[0] - points[1]), np.linalg.norm(points[2] - points[3]))
height = max(np.linalg.norm(points[1] - points[2]), np.linalg.norm(points[3] - points[0]))

output_points = np.array([(0, 0), (width - 1, 0), (width - 1, height - 1), (0, height - 1)], dtype=np.float32)

matrix = cv2.getPerspectiveTransform(points, output_points)

output_image = cv2.warpPerspective(image, matrix, (int(width), int(height)))

cv2.imshow('Cropped Image', output_image)
cv2.waitKey(0)