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)