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.
Example extracted patches using manual annotations. From top to bottom: samples of base, body, stem, and tip, respectively. Note that the key structural elements are not always centred in the patches as a result of the random cropping process for patch extraction.
