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.
Representative 3D image filters: 6 type-I filters at mid-scale around z-axis (a), 6 type-I filters at mid-scale around y-axis (b), 3D Gaussian filter (c), 6 type-II filters at mid-scale around z-axis (d), 6 type-II filters at mid-scale around x-axis (e), 3DLaplacian filter (f).
