IPP Progress Report for the week YYYY.MM.DD - YYYY.MM.DD

(Up to IPP Progress Reports)

Eugene Magnier

Heather Flewelling

Bill Giebink

Roy Henderson

Paul Price

• Image subtraction tuning
  • Problems with adding larger radii basis functions were due to kernel and stamp size set in simtest recipe.
  • Adding a large radius basis function (e.g., 18 pixels FWHM) is important for matching images with large seeing differences (as we sometimes get), but it requires a large (e.g., 40 pixels half-width) kernel and stamp, which may make finding suitable stamps difficult in the masky GPC1 images.
  • Implemented scaling of kernel basis set, kernel size and stamp size.
  • Moved detection efficiency call earlier in psphotReadoutMinimal so that it gets done even if there are no sources detected.
  • Testing on real PS1 images.
  • Setting SYS.ERR=0.1. Since USE_WEIGHT is off in pmSubtractionCalculateEquation.c, this only affects the rejection stage: brighter stars aren't rejected as easily.
  • Now getting reasonable dual convolution subtractions. Some more detected sources in dual convolution version with new code than with old code, due to low brightness background features, presumably bad dark subtraction or streakies (additional smoothing in dual convolution makes them more visible) which should be dealt with in other places.
  • Test on 10 random 3pi diffs yielded 4 good and 4 awful subtractions, with the other two intermediate.
  • Revised recipe kernel parameters to fix the awful subtractions.
  • Got ppStack working with revised PSF-matching code, added kernel parameter scaling.
• Fixed ppVizPSF to set CELL.[XY]BIN, CELL.[XY]PARITY in pmReadoutFake.
• Going pixel-crazy on manual masking

Bill Sweeney

At MPG.

Chris Waters