Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
A schematic overview of the reviewing stage. This graphic on top illustrates the operations that can be applied to each frame. The bottom panels show that such operations can be applied to individual frames, to a continuous segment of frames, and to frames sharing common attributes
