imageutils.py 文件源码

def clipped_linscale_img(img_array,
                         cap=255.0,
                         lomult=2.0,
                         himult=2.0):
    '''
    This clips the image between the values:

    [median(img_array) - lomult*stdev(img_array),
     median(img_array) + himult*stdev(img_array)]

    and returns a linearly scaled image using the cap given.

    '''

    img_med, img_stdev = np.median(img_array), np.std(img_array)
    clipped_linear_img = np.clip(img_array,
                                 img_med-lomult*img_stdev,
                                 img_med+himult*img_stdev)
    return cap*clipped_linear_img/(img_med+himult*img_stdev)