Orfeo Toolbox - Open Source Geospatial Tools: Applications in Earth Observation - page 205

(a) (b)

Fig. 13.8 Comparison of segmentation algorithms over Shannon airport. a Mean shift segmenta-
tion. b Edison segmentation

13.4 Edge Detection

In some cases it is necessary to run a filter on an image to help identify edges between
features located within images. For instance, it may be useful in order to identify
the edge between two land cover types or where the edge of lake meets land. For
these types of applications, OTB provides the otbcli_EdgeDetection module
which takes a single band image (or one band from a multispectral image) and uses
a filter to output the edge detected dataset as a raster image.

-progress
< boolean > Report progress

-in
<

string > Input Image (mandatory)

-channel
< int 32 > Selected Channel (mandatory, default value is 1)

-ram
<

>

int 32 Available RAM (Mb) (optional, on by default, default value is 128)

-filter
< string > Edge feature [gradient/sobel/touzi] (mandatory, default value is

gradient)
-filter.touzi.xradius
< The X Radius (mandatory, default value is 1)

-filter.touzi.yradius
<

int 32 >

int 32 > The Y Radius (mandatory, default value is 1)

-out
<

[pixel] FeatureOutput Image [pixel=uint8/uint16/int16/uint32/int32/
float/double] (default value is float) (mandatory)

string >