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| Paper: |
A Method for Minimizing Background Offset Errors When Creating Mosaics |
| Volume: |
77, Astronomical Data Analysis Software and Systems IV |
| Page: |
335 |
| Authors: |
Regan, M. W.; Gruendl, R. A. |
| Abstract: |
When creating a mosaic from a set of individual frames, the correct background offset for each frame must be determined for proper matching. In this paper we describe a method for constructing a mosaic from a set of individual frames by applying a chi (2) minimization technique. This technique uses the offset between all overlapping pairs of frames to determine the best background offset for each frame. This technique was developed for use with infrared arrays; it has been used with the existing Simultaneous Quad Infrared Imaging Device (SQIID) software within IRAF, but applies to any image that is created from several individual frames. We also describe several techniques that allow objective criteria to be used to identify individual frames to be excluded from a mosaic. We present examples of our technique using two computer programs and compare the results with simpler methods. This technique is extremely powerful for examining low surface brightness objects. |
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