In [1]:

    

import skimage.io
import skimage.metrics


    

In [2]:

    

img_org = skimage.io.imread('data/src/lena.jpg')
img_q95 = skimage.io.imread('data/src/lena_q95.jpg')
img_q50 = skimage.io.imread('data/src/lena_q50.jpg')


    

In [3]:

    

print(skimage.metrics.peak_signal_noise_ratio(img_org, img_q95))


    

    




39.024557583745676

In [4]:

    

print(skimage.metrics.peak_signal_noise_ratio(img_org, img_q50))


    

    




30.34829234238757

In [5]:

    

print(skimage.metrics.peak_signal_noise_ratio(img_org, img_org))


    

    




inf






    




/usr/local/lib/python3.7/site-packages/skimage/metrics/simple_metrics.py:160: RuntimeWarning: divide by zero encountered in double_scalars
  return 10 * np.log10((data_range ** 2) / err)

In [6]:

    

print(skimage.metrics.peak_signal_noise_ratio(img_org, img_q95, data_range=255))


    

    




39.024557583745676