XMM-Newton Science Analysis System
imgrad (tools-1.68) [xmmsas_20190531_1155-18.0.0]
imgrad
Abstract:
This task approximates the gradient at each pixel of an image by doing least-squares fitting of a plane to the 3x3 array of values centred on each pixel.
XMM-Newton SOC/SSC -- 2019-06-02