Hi,
In OTB, a window radius is always the half-size of the window without
the center pixel. Therefore, you are right: the window size = 2 * radius + 1.
I assume that you are trying to use the HaralickTextureExtraction
application.
Displacement and orientation are given using the 2 offset parameters.
Displacement and orentation define a vector in polar coordinates, while
xoffset and yoffset define it in cartesian coordinates:
displacement = sqrt(xoffset^2+yoffset^2)
orientation = atan(yoffset/xoffset)
The HaralickTextureExtraction allows you also to define the parameters
of the histogram (min, max, number of bins) used for the computation of
the co-occurrence matrix.
You can also compute only sub-sets of the whole list of Haralick
textures with the "-texture" parameter setting it to
simple/advanced/higher:
simple: Energy, Entropy, Correlation, Inverse Difference Moment,\
Inertia, Cluster Shade, Cluster Prominence and Haralick Correlation
advanced: simple + Mean, Variance, Sum Average, Sum Variance,\
Sum Entropy, Difference of Entropies, Difference of Variances, IC1 and IC2
higher: advanced + Short Run Emphasis, Long Run Emphasis, Grey-Level
Nonuniformity, Run Length Nonuniformity, Run Percentage, \
Low Grey-Level Run Emphasis, High Grey-Level Run Emphasis, Short Run Low
Grey-Level Emphasis, Short Run High Grey-Level Emphasis, \
Long Run Low Grey-Level Emphasis and Long Run High Grey-Level
Emphasis
The output of the application is a multi-channel image with the textures
in each band in the order given above.
Jordi
OneK <[email protected]> wrote:
>
> Hey Everyone,
>
> I'm trying to use the Haralick Texture in OTB, but I don't find clear
> information about it.
>
> We have to define 3 main parameters which are :
>
> - window size,
> - displacement,
> - orientation.
>
> First of all, I can't really understand if "radius" is equal to the size of
> window or if I have to use the formula : window size = 2 * radius + 1 ?
> In the first case, we will have a window of 2*2 per default (???) and in the
> second case, we will have a window of 5*5 per default (I prefer).
> What is the good answer ? The first, the second, noone ??
>
> Secondly, I would like to understand if the offset give an information on the
> displacement in pixels (example : offset x = 1 and offset y = 1 give a
> displacement of one pixel)
> or if it gives information on the orientation (example : offset x = 1 and
> offset y = 1 give an orientation of 45°) ? I am really confused...
>
> We have any other parameter to define in order to launch a texture Haralick
> int OTB. Where is the 3rd parameter ??
>
> Thanks for your help,
> Best regards,
>
> OneK
>
>
> --
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