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.
Calculated gradient lines. (a) A set of calculated gradient lines after curve fitting in the x-direction. All of the gradient lines are scaled such that their maximum equals unity. (b) After multiplying by scaling factors, the combination of x- and y-gradient lines form a gradient mesh. The scaling factors are computed by minimizing the least square differences between the x- and y-gradient lines at the intersections.
