Changes between Version 9 and Version 10 of Background_Oversubtraction
- Timestamp:
- Mar 15, 2011, 3:12:30 PM (15 years ago)
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Background_Oversubtraction
v9 v10 1 1 == Background Model and Over and Under Subtraction on GPC1 Images == 2 2 (Up to the [wiki:IPP_for_PS1 IPP for PS1]) 3 4 '''update : looking into this further, it seems like the technique described below rejects too many real galaxies; the necessary parameters are probably too sensitive to things like seeing and background. I have done further work to address this issue using the peak/footprint culling described here: [wiki:PeakCullingInPSPHOT Peak Culling in psphot]. 3 5 4 6 Bill identified an image from the CNP dataset which was generating large numbers of detections and taking an extremely long time to process. Checking into this, I discovered that there is a problem with the source detection, particularly in cases where the background model is unable to follow the structures in the background, and when the image quality is poor (large FWHM). At a suggestion from Michael Wood-Vasey, I have added an additional source filtering which appears to improve this situation.
