The glass-to-glass latency of this demonstration was measured by streaming a digital stopwatch and calculating the time difference between the actual stopwatch and the displayed stopwatch. Figure 7-3 shows an example of the latency measurement:

• The actual real-time stopwatch was at 09:52:32 when the picture was taken.
• The displayed stopwatch was at 09:52:26 when the picture was taken.
• The displayed stopwatch lagged the actual stopwatch by 60 ms, which was considered the glass-to-glass latency.

This demonstration did not perform deep learning analytics and thus the latency did not include what is introduced by the deep learning processing. According to Table 5-1, the total latency is 57 ms without the deep learning block. Considering measurement errors, the measured latency of 60 ms is very close to the estimated value.