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.
Image contrast enhancement by averaging. (a) Single image with 2x enlargement in box on left. (b) Averaged of 2 consecutive images, corresponding to a 5 μm pullback distance. (c) Averaged of 4 consecutive images, corresponding to a 10 μm pullback distance.
