编写算法实现图片透视变换
时间: 2023-11-15 19:22:25 浏览: 78
1. 定义输入和输出
输入:原始图片,四个角点坐标;
输出:透视变换后的图片。
2. 计算变换矩阵
根据四个角点坐标,计算其对应的目标点坐标。使用cv2.getPerspectiveTransform()函数计算透视变换矩阵M。
3. 进行透视变换
使用cv2.warpPerspective()函数进行透视变换,将原始图片变换为目标图片。
4. 实现代码
```python
import cv2
import numpy as np
# 读取原始图片
img = cv2.imread('image.jpg')
# 定义四个角点坐标
src_pts = np.float32([[0, 0], [img.shape[1], 0], [img.shape[1], img.shape[0]], [0, img.shape[0]]])
dst_pts = np.float32([[0, 0], [img.shape[1], 0], [img.shape[1]*0.75, img.shape[0]*0.8], [img.shape[1]*0.25, img.shape[0]*0.8]])
# 计算透视变换矩阵M
M = cv2.getPerspectiveTransform(src_pts, dst_pts)
# 进行透视变换
result = cv2.warpPerspective(img, M, (img.shape[1], img.shape[0]))
# 显示结果
cv2.imshow('Original Image', img)
cv2.imshow('Perspective Transform', result)
cv2.waitKey(0)
cv2.destroyAllWindows()
```
5. 运行结果
原始图片:

透视变换后的图片:

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