Itseez/opencv — pull request #1795 by alalek (2013-11-13 14:37:57+00:00)
Title: perf report: summary.py: added --progress mode

Basically we compare `i` sample with the first reference sample (`0`). It is useful to compare different implementations/devices (samples represent different implementations).
This PR add the progress mode, when we compare `i` sample with the previous `i - 1` sample. This mode is useful to track changes "in time": samples represent different timestamps.