Averaging circles filter

A new feature was added to KOPR software, first it is possible to use it since version 0.57 (it was added in version 0.56 but didn’t work properly).

Averaging circles filter is doing pixel intensity measure in circle slices around coma photometric center and finding a median value for pixels in circle selection. By limit set (100% by default) a pixels with value larger than median * (1+limit) are excluded from average calculation, than total number of pixels are multiplied by resulting average value.

Comet with bright star inside aperture radius.
Bright star causing a large error in comet magnitude, causing it to be ~1 mag larger.
Same measure with use of ACF filter. star influence was removed from result.

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