scipy.signal.wiener 始终显示警告

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)

但我总是收到此警告：

/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)

我猜我们将 "divided by zero" 反驳为下溢数。

scipy.signal.wiener 始终显示警告

scipy.signal.wiener always show warning

python

filter

scipy

noise-reduction