60 lines
2.4 KiB
HTML
60 lines
2.4 KiB
HTML
<HTML>
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<HEAD>
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<TITLE>The Local Maximum Search Module</TITLE>
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</HEAD>
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<BODY>
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<h1>The Local Maximum Search Module</h1>
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<p>
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This module allows to search for local maxima in two-dimensional
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datasets stored within a SICS histogram memory. All commands
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act upon the current content of the histogram memory. The following
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commands are understood:
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<dl>
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<dt>lowmax stat hm
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<dd>calculates the average and the maximum count in the frame
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currently held in histogram memory hm.
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<dt>lowmax search hm
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<dd>searches the frame held in histogram memory hm for local
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maxima. Local maxima are returned as sets of three numbers which are
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the x and y coordinates and the intensity. Each set of numbers is
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separated from the next one by the @ symbol.
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<dt>lowmax cog hm x y
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<dd>calculates the center ogf gravity for the pixel at coordinates x
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and y in histogram memory hm. Four numbers are returned: the new x and
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y coordinates, the intensity of the peak and the number of points
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contributing to the peak.
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<dt>lowmax steepness val
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<dd>accesses the steepness parameter for the peak search. With a
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parameter val sets a new value, without print the current value.
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<dt>lowmax window val
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<dd>accesses the window parameter for the peak search. With a
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parameter val sets a new value, without print the current value.
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<dt>lowmax threshold val
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<dd>accesses the thresholds parameter for the peak search. With a
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parameter val sets a new value, without print the current value.
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<dt>lowmax cogwindow val
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<dd>accesses the cogwindow parameter for the peak search. With a
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parameter val sets a new value, without print the current value.
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<dt>lowmax cogcontour val
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<dd>accesses the cogcontour parameter for the peak search. With a
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parameter val sets a new value, without print the current value.
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</dl>
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The local maximum search can be tuned through the parameters: The
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window parameter sets the size of the quadratic area for which a
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candidate pixel must be the local maximum. Threshold sets a minimum
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count rate for a local maximum. Steepness sets a minimum difference to
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the borders of the window used for the local maximum search which must
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be fulfilled.
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</p>
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<p>
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The center of gravity calculation can be tuned mainly through the
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cogcontour parameter which determines at which percentage of the
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maximum value of the peak the center of gravity calculation
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stops. Cogwindow is the size of the area in which a center of gravity
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is calculated. Can be set rather generously.
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</p>
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</BODY>
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</HTML>
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