[GRASS-dev] [GRASS GIS] #3210: r.texture: bug when non continuous series of values

[GRASS GIS]

#3210: r.texture: bug when non continuous series of values
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  Reporter:  mlennert     |      Owner:  grass-dev@…
      Type:  defect       |     Status:  new
  Priority:  normal       |  Milestone:  7.2.0
 Component:  Raster       |    Version:  svn-trunk
Resolution:               |   Keywords:  r.texture
       CPU:  Unspecified  |   Platform:  Unspecified
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Comment (by mlennert):

 Just one question:


 The manual says:

 r.texture  assumes  grey levels ranging from 0 to 255 as input.  The input
 is automatically rescaled to 0 to 255 if the input map
        range is outside of this range.


 But when I rescale the above (second) matrix to 0,255 I get a different
 result:


 {{{
 r.in.ascii --o in=- out=test_matrix <<EOF
 north: 3
 south: 0
 east: 3
 west: 0
 rows: 3
 cols: 3
 1 1 1
 3 0 0
 0 0 3
 EOF
 r.texture -s test_matrix out=text method=idm --o
 r.stats -1n text_IDM_90
 0.40000007

 r.rescale test_matrix out=test_matrix_rescaled to=0,255
 r.texture -s test_matrix_rescaled out=text_rescaled method=idm --o
 r.stats -1n text_rescaled_IDM_90
 0.16672371
 }}}

 I would have thought that the result should be the same ?

 Moritz

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Ticket URL: <https://trac.osgeo.org/grass/ticket/3210#comment:3>
GRASS GIS <https://grass.osgeo.org>