bugGNU Astronomy Utilities - Bugs: bug #44888, Convolve on sections of image if...

 
 

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bug #44888: Convolve on sections of image if input is too large

Submitted by:  Mohammad Akhlaghi <makhlaghi>
Submitted on:  Tue 21 Apr 2015 02:08:44 AM UTC  
 
Category: ConvolveSeverity: 3 - Normal
Item Group: CrashStatus: Postponed
Privacy: PublicAssigned to: None
Open/Closed: Open

Wed 27 May 2015 01:24:26 AM UTC, comment #2:

This problem only exists for frequency space convolution.

This can be fixed by using the channel structure, explained in the "Tiling an image" part of the manual. If a channel structure is introduced, then frequency space convolution can be done on each channel independently, thereby decreasing the number of pixels in each row and column, increasing the speed and decreasing the burden on the CPU.

Each row and column that is given to the FFT algorithm can be larger than the channel by half the PSF size. This will allow edge effects to not harm the convolution on the channels that are not lying on the edge of the image.

Mohammad Akhlaghi <makhlaghi>
Project Administrator
Tue 21 Apr 2015 02:08:44 AM UTC, comment #1:

This item has been reassigned from the project GNU Astronomy Utilities task tracker to your tracker.

The original report is still available at task #13560

Following are the information included in the original report:

[field #0] Item ID: 13560
[field #1] Group ID: 11425
[field #2] Open/Closed: Open
[field #3] Severity: 3 - Normal
[field #4] Privacy: Public
[field #9] Category: Convolve
[field #10] Submitted by: makhlaghi
[field #11] Assigned to: None
[field #12] Submitted on: Mon 20 Apr 2015 03:22:14 PM JST
[field #13] Summary: Convolve on sections of image if input is too large
[field #14] Original Submission: When the image size is too large, cut the image into smaller pieces and convolve them then stitch the separate convolved parts to make the output. Since by default Convolve makes heavy use of all the CPU cores in the frequency domain, if the image is too large (in width or height or both), it can take too long and the CPU will heat up to dangerous limits.
[field #16] Item Group: Crash
[field #17] Status: Postponed
[field #18] Component Version: None
[field #19] Operating System: None
[field #20] Reproducibility: None
[field #21] Size (loc): None
[field #22] Fixed Release: None
[field #23] Planned Release: None
[field #24] Effort: 0.00
[field #28] Priority: 5 - Normal
[field #29] Should Start On: Mon 20 Apr 2015 12:00:00 AM JST
[field #30] Should be Finished on: Mon 20 Apr 2015 12:00:00 AM JST
[field #31] Percent Complete: 0%
[field #33] Release: None
[field #58] Custom Select Box #1: None
[field #59] Custom Select Box #2: None
[field #60] Custom Select Box #3: None
[field #61] Custom Select Box #4: None
[field #62] Custom Select Box #5: None
[field #63] Custom Select Box #6: None
[field #64] Custom Select Box #7: None
[field #65] Custom Select Box #8: None
[field #66] Custom Select Box #9: None
[field #67] Custom Select Box #10: None

Mohammad Akhlaghi <makhlaghi>
Project Administrator
Tue 21 Apr 2015 02:08:44 AM UTC, original submission:

When the image size is too large, cut the image into smaller pieces and convolve them then stitch the separate convolved parts to make the output. Since by default Convolve makes heavy use of all the CPU cores in the frequency domain, if the image is too large (in width or height or both), it can take too long and the CPU will heat up to dangerous limits.

Mohammad Akhlaghi <makhlaghi>
Project Administrator

 

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    Follow 4 latest changes.

    Date Changed By Updated Field Previous Value => Replaced By
    Wed 27 May 2015 01:24:26 AM UTCmakhlaghiCategoryNone=>Convolve
      Item GroupNone=>Crash
      StatusNone=>Postponed
    Tue 21 Apr 2015 02:08:44 AM UTCmakhlaghiReassign itemGNU Astronomy Utilities, task #13560=>GNU Astronomy Utilities, bug #44888

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