| | 15 | |
| | 16 | == Overview == |
| | 17 | On April 12 Peter Draper pointed out that the Kron radii measured by psphot using the default recipe are much lower than those |
| | 18 | measured by SExtractor. He found that if the gaussian weighting function is removed, more sensible results are obtained. |
| | 19 | See plot at http://ps1sc.ifa.hawaii.edu/PS1wiki/index.php/KP12videocon_page#Kron_radii_-_possible_improvement |
| | 20 | |
| | 21 | Using a set of 40 simulated images provided by Peter we have done many experiments with psphot to invesigate |
| | 22 | the accuracy of the kron measurements. We reported April 30 at the DRAVG |
| | 23 | meeting that results closer to SEXtractor can be achieved with a prototype version of psphot which |
| | 24 | smooths the input image with a 1.7 pixel gaussian prior to measuring the kron radius and flux. |
| | 25 | http://ps1sc.ifa.hawaii.edu/PS1wiki/index.php/DRAVG_telecon#Kron_radii_improvements |
| | 26 | |
| | 27 | We have more carefully implemented the smoothing function and the code is now included in the ipp-trunk. |
| | 28 | |
| | 29 | There are several recipe values that now may be used to control the psphot kron measurements |
| | 30 | |
| | 31 | |
| | 32 | |
| | 33 | |
