problem with grid/collection stitching

Posted by Aryeh Weiss on Aug 24, 2016; 3:49am
URL: http://imagej.273.s1.nabble.com/problem-with-grid-collection-stitching-tp5017105.html

I am having trouble with stitching the following set of images (filename
defined positions):

https://drive.google.com/file/d/0Bytu294eIohjUE5waC1EQUhfZE0/view?usp=sharing
The above link is to a zip file that contains the 120 tiles that I am
trying to stich (nominally 10% overlap)

With the default parameters, the following is obtained, with many
"misplaced" tiles
Here is a link to what I get.
https://drive.google.com/file/d/0Bytu294eIohjbzYwWG15bW5qWEk/view?usp=sharing

If I reduced the regression threshold to 0.02 (from 0.3), it is better,
but I still have the (1,1) tile misplaced:
https://drive.google.com/file/d/0Bytu294eIohjbDQ0N2VxVVVuUVE/view?usp=sharing

If I repeat with the smaller regression threshold, but I only stitch the
top half of the image, including the (1,1) tile, it works correctly.

By eye it looks like I have enough  "structure" (marks, spots, etc) to
align. In any case, I dont see how it can get so misalligned, even when
I reduced the max/avg displacement.

Is there something inherently wrong with  with my images? Is there a
better set of parameters which I can use to get it right.

Thanks in advance for any help you can provide.

--aryeh

--
Aryeh Weiss
Faculty of Engineering
Bar Ilan University
Ramat Gan 52900 Israel

Ph:  972-3-5317638
FAX: [phone]

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