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This algorithm first finds the largest intensity pixel in a square region set by a "rank" parameter:  peaks include all pixels with intensity above zero in the square region spanning from −rank to +rank in both the row and column directions relative to the maximal intensity pixel.

Peak Finder "V3"

The same algorithm as Peak Finder V1, but the radial parameter for peak finder is separated form the radial parameter for background estimation, which is done in the second stage.

In a second stage, all pixels associated with a peak are used to evaluate the row and column of the peak maximum, total intensity, center of gravity coordinates, and edges of the peak region.  A surrounding user-specified ring-region of pixels around the peak is used to evaluate average background level, its rms spread, and signal-over-noise ratio. The user will typically reduce the number of peaks returned from these algorithms by applying cuts to signal levels or signal-over-noise ratio.