Figure 2.
Input and output of the system along with corresponding images: (a) a letter “H” and (b) a Chinese character “
”.
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.