opencv 图片旋转

import cv2 as cv
import numpy as np # 图片旋转
img = cv.imread('../images/face.jpg', flags=1) # flags=1读取为彩色，flags=0读取为灰度
h, w = img.shape[:2]
mat_rotate = cv.getRotationMatrix2D(center=(w*0.5, h*0.5), angle=45, scale=1) # center旋转中心 angle旋转角度 scale缩放比例
dst = cv.warpAffine(img, mat_rotate, (w, h))
cv.imshow('img1', img)
cv.imshow('img2', dst)
cv.waitKey(0)