# -*- coding:gb2312 -*-import cv2from math import *import numpy as npimg = cv2.imread("3-2.jpg")height,width=img.shape[:2]degreeAffine=45#切变换最后结果heightAffine=heightwidthAffine=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/2tempX=(heightAffine+1)/2-height/2temp=np.zeros((heightAffine,widthAffine,3),np.uint8)+255temp[tempX:(tempX+height),tempY:(tempY+width)]=imgcv2.imshow("temp",temp)#仿射变换矩阵matAffine=np.zeros([2,3])matAffine[0,0]=1matAffine[0,1]=tan(radians(degreeAffine))matAffine[0,2]=(widthAffine-width)/2matAffine[1,0]=0matAffine[1,1]=1matAffine[1,2]=(heightAffine-height)/2imgAfiine=cv2.warpAffine(img,matAffine,(widthAffine,heightAffine),borderValue=(255,255,255))cv2.imwrite("temp.jpg",temp)cv2.imwrite("imgAffine.jpg",imgAfiine)cv2.imshow("imgAffine",imgAfiine) 
