python opencv实现切变换不裁减图片

Z时代
2024-01-10
分类：综合

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)