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##

SUM

SUM
This program is used to sum many images, handling a weight image in or-
der to produce the average image later on.
It computes X(i,j) = X(i,j) + F * Z(i,j)
and Y(i,j) = Y(i,j) + F
for all non blanked pixels of the input image Z. When called
repetitively with the same input/output images X and Y, X contains the
weighted sum of all Z images, and Y the weight of each pixels. A
parameter is provided to initialise the process.
The last step to obtain the average image is to divide X by Y using pro-
gram COMBINE with option DIVIDE. You can also use SIC command LET to do
so, but SUM and COMBINE will handle properly blanking values.

Gildas manager
2020-07-04