opencv图像旋转

 y_img = cv2.flip(img, 1)  # 水平翻转，1=沿Y轴

x_img = cv2.flip(img, 0)  # 垂直翻转，1=沿Y轴， 0=沿X轴

x_y_img = cv2.flip(img, -1)  # -1 = 先水平翻转再垂直翻转，先沿Y轴翻转再沿X轴翻转

tran_img = cv2.transpose(img)

# 顺时针旋转90度
def Rotate90(img):
    trans_img = cv2.transpose(img)
    new_img = cv2.flip(trans_img, 1)
    return new_img

# 逆时针旋转90度
def Rotate_90(img):
    trans_img = cv2.transpose(img)
    new_img = cv2.flip(trans_img, 0)
    return new_img