[daip] IMEAN and noise

[Glenn Morrison]

Hi Eric,

Questions on how IMEAN works:


1) Does IMEAN just take all the pixel values in the image and then 
constructs a histogram, right?

2) Does it assume that all the pixel are independent, that there exists 
no correlation between individual pixels?

3) My Boss here at KPNO seems to think that in the radio image we are 
looking at (http://www.noao.edu/staff/morrison/home/GOODS/HDFNRADIO.html)
--that because the image seem to be smoothly varying (i.e., that the 
pixel values do not seem vary much) that the pixel values are 
correlated. Does this make sense to you and can you draw this kind of 
conclusion by visual inspection?

-Thanks

--Glenn