Hi,
Jonathan was only talking about an optimization for speed-up made in
Edison library. The plain MeanShift implementation takes into account
all bands and does not depend on the band order.
So if you use -filter meanshift as argument to the Segmentation
application, you will get this behaviour.
Regards,
Julien
Le 25/02/2014 08:57, Agustin Lobo a écrit :
Hi!
How many bands are actualy being considered in the Mean Shift segmentation
process? According to the message by Jonathan Guinet I reproduce, only
1 band is used, but
I'm not sure if this is the case for all the process or just for part of it.
Thanks
Agus
""""""""
Jonathan Guinet [email protected] Unsubscribe
10/21/13
to otb-users
Hy Eleni
you underline an interesting point in a previous message :
"
I notice that if I change the sequence of the bands ( ie from
RGBLIDAR to LIDARRGB ) the output clustered image is different
Is this reasonable?
"
this behavior is due to a processing optimization used by default when
wrraping EDISON (the MED_SPEEDUP algorithm) :
The bucket mode.explained in following reference :
Mean Shift Segmentation Evaluation of Optimization
Techniques Jens N. Kaftan and Andr`e A. Bell and Til Aach
To reduce exploration space a 3D hypercube is used the bucket. this
bucket is composed of spatial ranges : X,Y (the two first
dimensions) and dynamic range (the third dimension) i.e. the first
band of data. thus Only the first band of data is taken into
consideration to reduce exploration
Thus the sequence of band gives differents results.
"""""
--
Julien MICHEL
CNES - DCT/SI/AP - BPI 1219
18, avenue Edouard Belin
31401 Toulouse Cedex 09 - France
Tel: +33 561 282 894 - Fax: +33 561 283 109
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