Author Topic: II MRS noise evaluation warning?  (Read 2730 times)

Offline mschuster

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II MRS noise evaluation warning?
« on: 2012 June 22 16:21:02 »
I just did an 18 sub ImageIntegration and see this warning logged:
    No convergence in MRS noise evaluation routine - using k-sigma noise estimate.

Below that in the log I see:
    Gaussian noise estimates:
    ?s = 2.205e-004

I ran Script>NoiseEvaluation on the integration and get this:
   * Channel #0
   ?K = 9.520e-005, N = 65045 (3.12%), J = 3

The integration visually appears to be OK.

II parameters were what I usually use for lights: Average, Additive, Noise evaluation, Winzorized Sigma Clipping, Scale + zero offset.

What is the meaning of the different ?s and ?K measurements and what is the significance of their differences? I would like to learn more about this.

Is there any way of telling why convergence failed? Note: when I integrate only 7 subs (using Percentile Clipping) rather than all 18 no warning appears.

I attached a copy of the log.

Thanks,
Mike