I'm testing Rigid Transformation Resample to apply a model fitted out
of set of Homologous Points. (I'm also testing using a model derived
from interactive
points as well as Fine Registration, but that's another story).
Interband misalignments are substantial as the images come from a
multicam aboard a drone. 5 bands (B,G,R,REdge,NIR).
The procedure is
1. otbcli_HomologousPointsExtraction between each band and band 4
(taken as reference band)
2. Fit a model in R. Example of model:
s alfa dx dy
1 1.0029784 0.06989697 -5.819075 -3.871411
2 1.0069938 0.02176913 -45.387618 -5.723231
3 1.0029354 0.02747776 25.232517 7.283582
4 0.0000000 0.00000000 0.000000 0.000000
5 0.9994018 0.04154600 3.444670 2.325798
So essentially no scaling, small rotation (~1 to 4 deg) and substantial shifts.
3. Apply model with otbcli_RigidTransformResample (2 times for each
image, one for the rotation then for the translation)
After testing in 5 images, I get very good results for all bands
except for band 2, where the shift seems to be overestimated by
several pixels .
Any idea on why?
Thanks,
Agus
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