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.
The noise characteristic graph shows the standard deviation as a function of the mean pixel counts. The power fit shows that the mean pixel count is proportional to the standard deviation to the power of 1.97, which matches the property of ideal Poisson distribution, i.e., the mean pixel count is proportional to the square of the standard deviation.
