图像增强

水平翻转（标注翻转）：
def random_horizontal_flip(image, bboxes):
    _, w, _ = image.shape
    # [::-1] 顺序相反操作
    # a = [1, 2, 3, 4, 5]
    # a[::-1]
    # Out[3]: [5, 4, 3, 2, 1]
    image = image[:, ::-1, :]
    bboxes[:, [0, 2]] = w - bboxes[:, [2, 0]]
    return image, bboxes
bbox = np.array([[185,62,279,199,14]])
image = np.array(cv2.imread("000001.jpg"))
image1, bboxes = random_horizontal_flip(image.copy(), bbox.copy())
cv2.namedWindow(‘0‘,0)
cv2.imshow(‘0‘,image1)
cv2.waitKey(0)