tree 2a4014958af34ce60e68caec00c2760b0a41125d
parent 719c10d28d840b826352980f00fb27913c00b988
author Sarah Parker <sarahparker@google.com> 1542153701 -0800
committer Sarah Parker <sarahparker@google.com> 1542157499 +0000

Add function to take the difference between two frames

This will be used to compute the temporal derivative for disflow.

Change-Id: If121bab8495c3113f02e5bce7e7a35a9b8925a4a