LS2

Name

LS2

Purpose

Scale image between percentiles 1 and 99 (or specified percentiles).

Calling Sequence

out = ls2(in, [l, u, alo, ahi])

Inputs

in = input image. in
Byte, Int, and Uint scale to full data type range.
by default. Other data types scale to 0 to 255
by default. However, a floating result is returned.
l = lower percentile to ignore (def = 1). in
u = upper percentile to ignore (def = 1). in

Keyword Parameters

Keywords

MIN=mnout Output image min value.
MAX=mxout Output image max value.
Default min and max are full datatype range.
SCALE_ON=arr Array to determine scaling on. If not
given then input image in is used. As a special case
may give a 2 element array: [lo,hi] to scale to min, max.
/QUIET Inhibit scaling message.
/NOSCALE Do not actually scale the data (returns 0).
MISSING=miss Values to ignore for processing. Restore
when done. Note: MISSING applies to the input image
array, not the SCALE_ON array if given.
WMISS=wmiss 1-d indices into each color component
where data missing (-1 if no missing data).
WGOOD=wgood 1-d indices into each color component
where data is good.
NBINS=nbins Number of histogram bins to use (def=600).

Outputs

alo = value scaled to min out
ahi = value scaled to max out
out = scaled image. out

Common Blocks

Notes

Notes: Uses cumulative histogram.

Modification History

R. Sterner, 2002 Jun 21
Copyright (C) 2002, Johns Hopkins University/Applied Physics Laboratory
This software may be used, copied, or redistributed as long as it is not
sold and this copyright notice is reproduced on each copy made. This
routine is provided as is without any express or implied warranties
whatsoever. Other limitations apply as described in the file disclaimer.txt.

LS2