For humans, the image appears to have stayed the same, but the network thinks differently. It now classifies the tiger as a cockroach with a high probability:
In[8]:=
net[tiger2,"TopProbabilities"]
Out[8]=
cockroach
0.864649
The network has been fooled by small changes with high spatial frequency:
In[9]:=
diff=ImageDifference[tiger2,tiger];
In[10]:=
ImageMeasurements[diff,"Max"]
Out[10]=
{0.0465536,0.0533883,0.0475996}
In[11]:=
diff//ImageAdjust
Out[11]=
Note that this optical illusion is network specific. The neural network in
