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.
Hypothetical query by image example in a multiple-dimensional feature space (illustrated here in three dimensions). Each black dot represents a multidimensional feature vector that represents a database grain image. A query image is mapped into the same feature space (red dot). The nearest neighbors are selected and ranked with their corresponding images displayed to the user.
