image_utils.py 文件源码

def adjust_gamma(img, gamma=1.0):
    assert (img.shape[0] == 1)
    invGamma = 1.0 / gamma
    table = np.array([((i / 255.0) ** invGamma) *
                      255 for i in np.arange(0, 256)]).astype("uint8")
    new_img = cv2.LUT(np.array(img, dtype=np.uint8), table)
    return new_img