Problems with image alignment

Posted by Bernardo on Aug 18, 2016; 7:16am
URL: http://astroimagej.170.s1.nabble.com/Problems-with-image-alignment-tp448.html


Hi there!!,

I´m using AstroImageJ to analyse images from DAWN Mission.

For each zone I have 8 images using different filters...well, while the camera is changing the filter the spacecraft is still moving, for this reason the 8 images are displaced among themselves.

To aling the images I´m using a manual method: I measure the coordinates of one pixel in one of the images and use it as a reference for the following images. Then measure again the coordinates of this pixel on the other images; finally when I know the differences I do: Process--->Shift Image Manually

Do you know if there is a better and more precise method?

And another question...when I have aligned all the images there are parts of some of them that appear in black because of the displacement. I would like to delete these "black parts" because I think they´re giving me some problems using READFITS on GDL.

I use "Rectangular" to mark these regions and then use Image--->Crop. The problem is that after doing this the images come back to be displaced between them.

Do you know how it could be solved and having the images centered and without "black parts"?...

So sorry for being so noob using AstroImageJ and thanks a lot for your attention,

Bernardo