SubframeSelector Weighting Expressions
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ABCDEFGHIJKLMNOPQRSTUVWXYZ
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MinMaxWeight
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FWHM3.769.13609551
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Eccentricity0.270.76208
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SNRWeight0.791.182021
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Range60
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Weighting Expressions
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Original (fixed weights)
35*(1-(FWHM-4.7)/5.4) + 5*(1-(Eccentricity-0.33)/0.45) + 10*(SNRWeight-0.93)/1.02 + 50
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Original (variable weights)
51*(1-(FWHM-4.7)/5.4) + 8*(1-(Eccentricity-0.33)/0.45) + 21*(SNRWeight-0.93)/1.02 + 20
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Aggressive FWHM
51*((1/(FWHM^2))-0.00980296049406921)/0.0354663921541879 + 8*(1-(Eccentricity-0.33)/0.45) + 21*(SNRWeight-0.93)/1.02 + 20
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Notes
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- Enter the minimum and maximum values calculated by SubframeSelector for each of the metrics (blue boxes)
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- Adjust the weights to your preference
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- The range sets how much variance in the final weighted calculation. If set to 100, then the output weights will range from 0 to 100, meaning the worst frame would have no contribution to the final stack.
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- I like to use a range of 40 to 60, but it's up to you
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- If you want to weight based more on FWHM, I would use the last expression since the 1/FWHM^2 function will cause a more rapid drop off of weights as the FWHM increases
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- Once you've entered the data copy the expression to your SubframeSelector Weighting expression field (there may be spaces at the end of the text that will need to be deleted)
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Credits
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Charles Walker for his idea to use a document to aid in generating the weighting expressions
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David Ault for his SubframeSelector tutorial and weighting expressions
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Mike Schuster, for making the SubframeSelector script
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The PixInsight Development team, for making PixInsight
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