I have a muti-spectral image with inter-band misallignmet and use i.e.
$ otbcli_HomologousPointsExtraction -in1 TTC4510v2.tif -band1 3 -in2
TTC4510v2.tif -band2 2 -mode full -precision 20 -mfilter 1 -algorithm
sift -out TTC4510v2homSIFT3.txt
to find homologous points.
The image is geotif with arbitrary coordiantes:
$ gdalinfo TTC4511v2.tif
Driver: GTiff/GeoTIFF
Files: TTC4511v2.tif
TTC4511v2.tif.aux.xml
Size is 1280, 1024
Coordinate System is `'
Origin = (0.000000000000000,1024.000000000000000)
Pixel Size = (1.000000000000000,-1.000000000000000)
Image Structure Metadata:
COMPRESSION=LZW
INTERLEAVE=PIXEL
Corner Coordinates:
Upper Left ( 0.000, 1024.000)
Lower Left ( 0.0000000, 0.0000000)
Upper Right ( 1280.000, 1024.000)
Lower Right ( 1280.000, 0.000)
Center ( 640.000, 512.000)
Band 1 Block=1280x1 Type=UInt16, ColorInterp=Gray
I'd like to confirm:
1. The resulting points in
-out TTC4510v2homSIFT3.txt
are x,y coordinates with (0,0) at the bottom left.
2. The argument
-precision 20
means that homologous points in image B (band 2 in this case) will be
searched within a radius of 20 pixels of points in image A (band 3 in
this case)
3. The argument
-mfilter 1
means that couples of homologous points farer away than 20 pixels from
each other will be eliminated.
Could anybody confirm?
When I display the points in QGIS I find them kind of weird. First, I
do not see them
as salient sites at all. Second, I do not see that they track the
displacement (there is
a rotation + horizontal and vertical displacement). This is why I'd
like to make sure I'm making a correct interpretation of the manual.
Thanks
Agus
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