taskGNU Astronomy Utilities - Tasks: task #13633, Set the padded image sizes for FFT...


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task #13633: Set the padded image sizes for FFT to fast sizes

Submitter:  Mohammad Akhlaghi <makhlaghi>
Submitted:  Wed 27 May 2015 01:28:14 AM UTC
Should Start On:  Tue 26 May 2015 03:00:00 PM UTC Should be Finished on:  Tue 26 May 2015 03:00:00 PM UTC
Category:  Convolve Priority:  5 - Normal
Item Group:  Enhancement Status:  Postponed
Privacy:  Public Percent Complete:  0%
Assigned to:  None Open/Closed:  Open
Effort:  0.00

Wed 27 May 2015 01:28:14 AM UTC, original submission:  

The speed of the FFT algorithm significantly depends on the size. Such that if the size is a certain multiple of some numbers, then the speed will be very fast. Even if that size is larger than a bad size number.

When padding the image, currently the minimum best size (the size of the image plus the PSF) is used. See how an algorithm can be used to check if a better (larger size, but resulting in faster FFT) size can be defined.

Mohammad Akhlaghi <makhlaghi>
Project Administrator


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