... This noise can be reduced by replacing the pixels with an average of the surrounding values using a linear filter. In general, the image is convolved by a filter function giving the smooth image . ... The effects of applying linear filters to a CCD frame is shown in Figure . ... The result of the filter is shown in Figure . ... To remove stellar images from a picture of comet Halley, the results of applying different non--linear filters to the frame are given in Figure . ...

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... Transforms a qpoe file according to the specified parameters. ... Any type of filtering can be applied to the input qpoe file, including region filtering. In addition, the size of the output event record can be different from the size of the input event record. Of course, usually one makes the output record equal to or smaller than the input. If the output record size is made greater than the input record, a warning is issued and the ``extra'' part of the record is undefined.) ...

Next: Feature enhancement: normalizing Up: No Title Previous: Feature enhancement: pulsing . The inverse transform is at the core of the best known applications of wavelets: data compaction and numerics. ... Two applications fall within our scope: filtering and denoising. Filtering consists of using only a portion of the wavelet map in the inverse transform process, masking out certain durations. ... Figure 23: Filtered reconstruction of the intermittent signal. ...

... Previous: A Posteriori Guidance for Astronomical Images . ... We present an original algorithm for the recognition of anomalous events in a CCD frame (i.e., cosmic hits, bad pixels etc.) The algorithm is able to distinguish between these events and real features by comparing the standard deviation and the kurtosis of a synthetic PSF, whose width is given by the user, and the corresponding values in a running window, whose size is chosen by the user, in the actual frame. ...

Next: Self-Calibrating with Multiple Models Up: Computation Previous: Computation . Both selfcal and gpscal produce antenna gain tables in the same format as the calibration tasks previously described. ... Finally, if the primary gains have appreciable XY phase (for any antenna for selfcal , but for the reference antenna only for gpscal ), or significant amplitude gain mismatches (for selfcal only) then these corrections should be applied to the data before self-calibration. ...

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