http://imagej.273.s1.nabble.com/Stitching-1-1-Release-tp5007668p5010999.html
> Dear Stitching users,
>
> You may have noticed that the Stitching plugins (Plugins > Stitching >
> Pairwise stitching, and Plugins > Stitching > Grid/Collection stitching)
> take a fairly significant amount of time to get through the fusion process.
> Today, I am pleased to announce Stitching version 1.1 which features
> greatly reduced fusion times, available now in Fiji (just run Help > Update
> Fiji).
>
> Briefly, the old fusion paradigm was to iterate through output image's
> pixels and, at each position, check every input image to see if they
> overlapped at that position. By pre-computing these contribution ranges at
> the start of fusion, we can see significant performance improvements.
>
> The actual speedup will depend on the number of images being stitched and
> how much they overlap, but on a test dataset with ~150 images and 10%
> overlap, the new fusion method was over an order of magnitude faster (80
> seconds + ~10 seconds of pre-computation, down from 20 minutes with the
> previous Stitching version).
>
> We have done a number of tests comparing the output of the new plugin with
> the previous Stitching version, and as far as we can tell the new results
> are pixel-perfect matches with the old, so the quality of your data should
> not be affected.
>
> If you do run into any problems, errors, mis-stitches, etc... or have any
> questions/comments about the Stitching plugin and its uses, please let us
> know!
>
> Happy stitching!
> - Mark
>
> --
> ImageJ mailing list:
http://imagej.nih.gov/ij/list.html>