python - scipy.signal.wiener 总是显示警告

Question

我正在尝试在灰度图像中使用 Scipy 的维纳降噪函数:

image = data.imread(image_path, as_grey=True)
image = signal.wiener(image)

但我总是收到这个警告:

/usr/lib/python2.7/dist-packages/scipy/signal/signaltools.py:425: RuntimeWarning: divide by zero encountered in true_divide
      res *= (1 - noise / lVar)
    /usr/lib/python2.7/dist-packages/scipy/signal/signaltools.py:425: RuntimeWarning: invalid value encountered in multiply
      res *= (1 - noise / lVar)

过滤器工作正常，但为什么我会收到此警告？

Answer 1

尝试将输入图像的数据类型转换为float32或float64，即:

image = image.astype('float64')
image = signal.wiener(image)

我想我们将“除以零”作为下溢数进行了反驳。