very hard problem, and currently unsolved in science.
difference to reference image. But if you sometimes have also a movement of
somewhat or the antenna did not deploy fully.
we have to guess what kind of data you are working with.
Hello DÅŸenan,
Thanks for your suggestions. You asked for a sample of the data, one image
is attached herewith. Sometimes, there may be translation / rotation
involved in the field collected antenna image. How we can address that.
What examples I should follow. I apologies for posting directly.
Similarly I am working on another problem. How I can judge differences in
2 photographs acquired at different times. Translation and rotation will be
there as these photos are acquired manually using digital cameras. I am
looking for feature differences etc.
Thanks & regards
Prakash
what you might do is create mask of your deployed antenna and save it
along your reference image of the antenna. Then in field, acquire a new
image, apply the mask to both reference and field images, and then do a
difference. Try it with several different field images with different
lighting and states of deployment of the antenna to figure out a dependence
of pixel-wise difference in images and whether antenna was deployed
properly.
Regards,DÅŸenan
Hi DÅŸenan
Thank you very much for your help and guidance.
The images I am working with are 2D. Camera position is fixed with respect
to Antenna. Assuming there are no variations in foreground and background.
Lighting / Illumination may differ from lab and field conditions.
In the lab, images are acquired in still condition. Even though camera is
fixed with respect to each other, the entire system is not stationary but
moving.
Waiting for your advise
Thanks & regards
Prakash
are the images you are working with 3D or 2D? If 2D, do they have variable
lighting, variable background, variable foreground (maybe something
obscuring the antenna)? Does the camera move relative to antenna or not?
In the simplest case (camera not moving, lighting, foreground and
background not variable) you don't need to do any registration, just
subtract the images (reference and current) and compare difference against
a threshold to judge whether the antenna deployed. And each added variable
in the imaging process makes your task much harder.
Is the camera just pivoting in a fixed position? You could get away with
translation only during registration. Camera moving and pivoting, but
pointing at the same location? You will need deformable registration,
probably with manual initialization too. And so forth.
If you want more specific advice, be more specific in your question. And
show us some example images (reference and those being examined).
And you might as well post it on discourse, more people will see it as we
moved the discussions there.
Regards,DÅŸenan
Hi DÅŸenan,
Thanks for the reply. Earlier I was using ITK and after a long gap again I
required it. Actually I am planning to use ITK for whether an antenna is
deployed properly or not. I have antenna images (reference). I want to
match the image of deployed antenna with the reference images to judge
whether it is deployed properly or not. There are two things.
1. If needed I should be able to register my present image with reference
image without using any control points (if possible)
2. Automatic change / difference between the images.
As the example list is too vast can you please suggest what will be the
right choice for me.
Thanks & regards
Prakash
there are plenty of example for registration. You could take a look at the
ones on the wiki.
Regards,DÅŸenan
Hi all
I have some reference images acquired previously. Current images I want to
register with those images. What examples of ITK I should follow
Thanks & regards
Prakash
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