GIM2D/GBKG

Parameters

     in_image = "junkjunk2"     Name of input image
    msk_image = "gx120y120_m"   Name of segmentation image
      (dohist = no)             Compute background pixel histogram (yes/no)?
       (ohist = "gx304y89.bh")  Name of output histogram file
       (bsize = 0.1)            Bin size in background sigmas
        (mode = "q")

GBKG uses all the background pixels in the segmentation image of a science image to compute the following background parameters: number of background pixels, mean, median, mode, sigma, minimum and maximum values. If dohist is set to yes, then GBKG will produce a background pixel intensity histogram and save it to the file ohist. This histogram is very useful to study the effect of low-energy cosmic rays on background parameters. It is important to note that all background pixels within 5 pixels of an object pixel are not included in the background calculations. This is to insure that pixels just below the object flux threshold do not significantly affect background estimates.

Last Update: 14 June 1997
Comments/questions to Luc.Simard(at)nrc-cnrc.gc.ca