Using ImageJ to distort or skew an image.

[Blue]

I have a collection of several thousand images that I need to process, but we've realised that the camera wasn't aligned properly. I'm wondering if I can use ImageJ (or Fiji) and a macro to fix each image. Below is an example of what I want to do. Basically, by artificially skewing the image in the other "direction", we can "fix" the problem of the camera being off-centre when the image was taken.



I've been searching around online and here for an answer, but most solutions seem to be about fixing distortion due to the lens, which I think would be the fisheye effect. I've tried playing with ImageJ and reading the documentation, but I haven't figured it out that way, either. Apologies if this has been solved before.

Thanks!

[Michael Schmid]

Hi blue anonymous,

for correcting perspective, you need an affine transformation. E.g.
  http://www.imagescience.org/meijering/software/transformj/affine/
  http://imagej.net/Interactive_Affine
  http://ij.ms3d.de/plugins/affine_mapping.php
  http://www.med.harvard.edu/JPNM/ij/plugins/Align3TPmanual/Align3TPmanual.html
  http://imagej.nih.gov/ij/plugins/untilt-stack/index.html
  http://biocomp.cnb.csic.es/~iarganda/bUnwarpJ/

Michael
________________________________________________________________
On Apr 1, 2015, at 04:48, Blue wrote:

> I have a collection of several thousand images that I need to process, but
> we've realised that the camera wasn't aligned properly. I'm wondering if I
> can use ImageJ (or Fiji) and a macro to fix each image. Below is an example
> of what I want to do. Basically, by artificially skewing the image in the
> other "direction", we can "fix" the problem of the camera being off-centre
> when the image was taken.
>
> <http://imagej.1557.x6.nabble.com/file/n5012282/Untitled_zpshutsmag0.png>
>
> I've been searching around online and here for an answer, but most solutions
> seem to be about fixing distortion due to the lens, which I think would be
> the fisheye effect. I've tried playing with ImageJ and reading the
> documentation, but I haven't figured it out that way, either. Apologies if
> this has been solved before.
>
> Thanks!

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[Blue]

Ah, thanks for that. I did wonder if I had the correct terminology.

I'll make my way through the links and see if anything works. Thanks again!