An official website of the United States government
Here's how you know
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.
Illustration of comparison of GRI and GRI+FCR. Note that the FCR step yielded vivid and visually reasonable results compared with GRI only as visually assessed.