I was trying a similar thing of aligning images of stars. Could not get
the feature matching to work with any of the default parameters.
Add images. Set each one as a new lens
Create mask to exclude foreground. Copy and paste to all images. (Wish
you could select multiple images to do this)
I but modified Align image stack, then got tons of control points. Used
the Edit | Remove control points in masks, to remove the unwanted
control points.
-f %v -e --corr=0.4 -v -p %o %i
-e = Assume input images are full frame fisheye
-corr=0.4 = correlation threshold for identifying control points default 0.9
Did not try anything in between. It seamed I got very few bad values.
Choosing many different combination of images to get them all connected.
Optimizing y, p, r, x, y, z, b
Use this as a template.
This was still a lot of work. Before I finished I was told of a better way.
Sequator. Specifically made to stack star images. It can work on RAW
images, can incorporate Dark Frame, and cam stack the foreground and
stars separately with the freeze option.
https://sites.google.com/site/sequatorglobal/
My final result
http://photocreations.ca/Saints_Rest_Beach/index.html
Jim Watters
On 2018-07-25 11:01 PM, clepsydrae wrote:
Thanks as always for the excellent help -- I got the images to align
by doing as you said: paying more attention to the CPs.
align_image_stack was finding bad matches, but I was getting fooled
when I was checking the points. Closer inspection revealed that they
were bad. I ended up having to make manual points for the 1-63 pair,
as well as a few internal pairs (1-21, 21-42, 42-63). I then optimized
the 1-21-42-63 set (with Positions/Barrel/View, as Bruno suggested),
then I did a custom optimization with 1-21-42-63 fixed, and the result
wasn't perfect, but it was close enough to get the job done.
It's good to know about the ability to optimize/align subsets of
images, thanks for that!
-c
On Tuesday, July 24, 2018 at 9:56:43 AM UTC-7, T. Modes wrote:
Am Montag, 23. Juli 2018 22:31:25 UTC+2 schrieb clepsydrae:
Maybe it is sufficient to connect all images sequentially and
then run align_image_stack only on the first and last image to
connect them.
(align_image_stack can only cope with a limited amount of
movement. It this is too big between first and last image
you can do it e.g. to link only every tenth image -
connect images 0, 10, 20, 30, 40, 50 and 60)
Thanks -- I tried that (1-63 as well as connecting 1-7, 7-14,
14-21, etc, plus 2-62) -- it might have helped a little bit,
but didn't really make a difference. The statistical pull of
each immediate image connection seems too strong.
Have you checked the cp between the first and the last image? Are
the ok? Or have the many stars fouled align_image_stack and it has
selected a neighbor star? How big is the error between the first
and the last?
Maybe optimize first only the first and the last image. Then leave
them fixed and optimize the other images.
(I used the Fast Preview window to add these control points --
I assume that was your meaning.)
No, I meant to select only a subset of the images in the images
tab and run then align_image_stack on the subset.
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