I was wondering if we could add this as a feature to http://Infragram.org (and potentially MapKnitter in the future!) by writing a JavaScript Canvas module that removes lens distortion from an image.

I might've thought to do it in the same way we use Canvas to distort (https://github.com/publiclab/mapknitter/blob/master/public/cartagen/src/warper/image.js#L344)

but these days, we might be able to write a WebGL module to do it even faster.

This person has ported a lens distortion shader (http://devlog-martinsh.blogspot.ca/2011/10/glsl-cubic-lens-distortion.html) to WebGL:

https://medium.com/@mattdesl/filmic-effects-for-webgl-9dab4bc899dc

The shaders are here: https://github.com/mattdesl/filmic-gl/tree/master/demos/shaders

hmmm! I don't know webgl well, but it seems promising?

https://mapknitter.org/maps/bayou-st-john-shoreline-nov-2014

I also do not know webgl, but

this would be an excellent option to those softwares.

I've been using the Mobius Cam with both standard and Wide Angled Lens for KAP and soon UAV. I solved the lens distortion issue thanks to a workflow suggested to me in the comment section of my KAP research note- (see bottom 3 comments in the thread) http://publiclab.org/notes/code4maine/06-25-2014/kap-test-for-invasives-monitoring-project Basically, there is a Plugin called "BIMP" that allows you to do batch processing in GIMP. You do need to set the distortion values manually however, by taking a screenshot and copying the values into the plugin dialog. There are other FOSS programs for batch processing like DIGIKAM and HUGIN Panorama editor that I havent tried yet. However, considering the popularity of GIMP, it may be worth designing our own plugin with Mapknitter (and/or Infragram) support as more and more people use the Mobius Cam.

just getting back into this again. ajawitz, thanks for your BIMP recommendation.

i think i was going to figure out how to batch process

channel switching R-B, red boost to 130, then contrast boost