python opencv实现切变换 python opencv实现切变换 不裁减图片
yjl9122 人气:0# -*- 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)
效果图:
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