FIGURE 3.
Image captured by normal webcam (a) with light on and (b) with light off. The same images captured by IRS imaging system (c) with light on and (d) with light off.
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.