Comparison of sequentially taken flat frames with HX516

Flat images were taken on a cloudy night so some developments could be due to changes in the cloud structure. However clouds were pretty uniform. Exposure 30sec.

raw = distance image histogram gauss equalized
filtered = distance image gauss blur filtered sigma=4 and then histogram gauss equalized

#50 - #40
raw                                                                                Gauss filtered sigma=4
     

#50 - #30
raw                                                                                Gauss filtered sigma=4
     

#50 - #20
raw                                                                                Gauss filtered sigma=4
     

#50 - #10
raw                                                                                Gauss filtered sigma=4
     

#50 - #01
raw                                                                                Gauss filtered sigma=4
     

Two immediately neighboring images
#50 - #49
raw                                                                                Gauss filtered sigma=4
     

With more time in between exposures more structures become visible.
 

Statistics:

From the std-dev of images 1-20 vs 50 it appears that the camera was not fully in equilibrium. Perhaps still cooling down? These were the first images taken. Images 30 to 50 seem to be pretty homogenous.