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two-threshold peak-finding algorithm in restricted region around pixel with maximal intensity. Two threshold allows to speed-up this algorithms. It is assumed that only pixels with intensity above thr_high are pretending to be peak candidate centers. Candidates are considered as a peak if their intensity is maximal in the (square) region of radius around them. Low threshold in the same region is used to account for contributing to peak pixels.

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peak_finder_v1

peaks = alg.peak_finder_v1(nda, thr_low=10, thr_high=150, radius=5, dr=0.05)

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• defines (square) region to search for local maximum with intensity above thr_high and contributing pixels with intensity above  thr_lo,
• is used as a r0 parameter to evaluate background and noise rms as explained in section below.

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peak_finder_v4

peaks = alg.peak_finder_v4(nda, thr_low=10, thr_high=150, rank=2, r0=5, dr=0.05)

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define peaks for regions of connected pixels above threshold

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peak_finder_v2

peaks = alg.peak_finder_v2(nda, thr=10, r0=5, dr=0.05)

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define peaks in local maximums of specified rank (radius), for example rank=2 means 5x5 pixel region around central pixel.

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peak_finder_v3

peaks = alg.peak_finder_v3(nda, rank=2, r0=5, dr=0.05)

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