Correlated noise between STIPS runs

[benw1]

I am finding that the noise in different STIPS-produced images is correlated. That is, if I run two different bands with 2 different SEED values, the noise peaks in each will be in the same pixels. This caused much trouble for source detection algorithms using the combined significance of counts across different bands.

[benw1]

This may be a reappearance of issue #21 ... not sure, except it is not using the cpu_pool

[benw1]

Updated STIPS, and am now retesting...

[york-stsci]

Any results from retesting?

[benw1]

This correlated noise is still occurring with the latest dev16 version. I'm setting the seed in the ObservationModule() using "random_seed" but the noise is correlated between runs. The background noise doesn't show this. I can see it best if I don't include a background, so it is likely something to do with how the read noise is being added.

[york-stsci]

To confirm, what you are doing is creating two ObservationModule() objects, each with a different input value of random_seed, but getting the same noise values?

[benw1]

I may have set the seed in the wrong line of the code. Please ignore for the moment while I continue testing.