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| Paper: |
Robust Estimation and Image Combining |
| Volume: |
77, Astronomical Data Analysis Software and Systems IV |
| Page: |
514 |
| Authors: |
Zhang, C. Y. |
| Abstract: |
A task GCOMBINE in the STSDAS package, for combining images, is briefly reviewed. With a stack of input images, one can identify bad pixels by comparing the deviation of a pixel from the mean with a user-specified threshold times the clipping sigma. It is crucial that estimation of the mean and sigma be robust against unidentified outliers, in order to reject cosmic ray events effectively. A variety of weighting schemes and means for storing noise characteristics are discussed. Information in neighboring pixels can also be used in a global way to identify cosmic rays. |
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