Re: help with TrakEM2 alignment

Posted by Saalfeld, Stephan on Apr 15, 2016; 1:41pm
URL: http://imagej.273.s1.nabble.com/help-with-TrakEM2-alignment-tp5016144p5016153.html

The deformed image is rendered by interpolation.  TrakEM2 uses bilinear
interpolation for export.  Your rendered image will have bands of
sharper and less sharp pixels depending on how close or far they fall
compared to the original pixels.  ImageJ's nearest neighbor
interpolator would preserve original pixels but lead to blocks and
aliasing.  ImageJ's bicubic interpolation would remedy the banding to
some extent but introduce halos.  We also have a Lanczos interpolator
in the pool that would also help with the banding and aliasing and also
introduce halos.  If there is true need to make this available in
TrakEM2's export, I am willing to add this as an option some time soon.
 But please first check how important it is really.

Thanks,
Stephan

On Fri, 2016-04-15 at 00:47 -0700, inesica wrote:

> Thank you very much! The deformable alignment tool helped me a lot.
> however,
> when i export the images that i worked on, the one that i realigned
> seems
> more blurry that the others (the second image in comparison with the
> first)...is that normal?
> <http://imagej.1557.x6.nabble.com/file/n5016149/image1-1.jpg>
> <http://imagej.1557.x6.nabble.com/file/n5016149/image1-2.jpg>
> thank you!
>
>
>
>
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