utils.py 文件源码

def preprocess_bitmap(bitmap):
    # contrast stretching
    p2, p98 = np.percentile(bitmap, (2, 98))
    assert abs(p2-p98) > 10
    bitmap = skimage.exposure.rescale_intensity(bitmap, in_range=(p2, p98))

    # from skimage.filters import threshold_otsu
    # thresh = threshold_otsu(bitmap)
    # bitmap = bitmap > thresh
    return bitmap