python opencv实现切变换不裁减图片_Python

python opencv实现切变换不裁减图片

2021-03-22 00:15yjl9122 Python

这篇文章主要为大家详细介绍了python opencv实现切变换，不裁减图片，具有一定的参考价值，感兴趣的小伙伴们可以参考一下

本文实例为大家分享了python opencv实现切变换的具体代码，供大家参考，具体内容如下

									# -*- coding:gb2312 -*-

									import cv2

									from math import *

									import numpy as np

									img = cv2.imread("3-2.jpg")

									height,width=img.shape[:2]

									degreeAffine=45

									#切变换最后结果

									heightAffine=height

									widthAffine=int(2*height*tan(radians(degreeAffine))+width)

									# 随意两点得到仿射变换矩阵

									# point1=np.float32([[50,50],[200,50],[50,200]])

									# point2=np.float32([[50,50],[100,50],[50,200]])

									# matAffine=cv2.getAffineTransform(point1,point2)

									#如果结果是正的图片

									tempY=(widthAffine+1)/2-width/2

									tempX=(heightAffine+1)/2-height/2

									temp=np.zeros((heightAffine,widthAffine,3),np.uint8)+255

									temp[tempX:(tempX+height),tempY:(tempY+width)]=img

									cv2.imshow("temp",temp)

									#仿射变换矩阵

									matAffine=np.zeros([2,3])

									matAffine[0,0]=1

									matAffine[0,1]=tan(radians(degreeAffine))

									matAffine[0,2]=(widthAffine-width)/2

									matAffine[1,0]=0

									matAffine[1,1]=1

									matAffine[1,2]=(heightAffine-height)/2

									imgAfiine=cv2.warpAffine(img,matAffine,(widthAffine,heightAffine),borderValue=(255,255,255))

									cv2.imwrite("temp.jpg",temp)

									cv2.imwrite("imgAffine.jpg",imgAfiine)

									cv2.imshow("imgAffine",imgAfiine)