Lens distortion removal can help "flatten" images with a "fisheye" or barrel distortion, and make it easier for them to be used in creating maps. This is especially helpful when using photos from smaller cameras like the #mobius-action-cam and most #gopro cameras. Nathan Craig says: > Also, lens calibration is useful to consider when creating surfaces. In building large surfaces lens error can accumulate and result in distortion. Agisoft, the makers of PhotoScan, provide a free lens calibration program on their website. **** ## Questions [questions:lens-distortion] **** ## Activities There are a number of ways to remove lens distortion, including #fisheyegl, [**LensFun**](http://lensfun.sourceforge.net/), and **Agisoft Lens**. We're collecting guides on using these here; please add one if you can! [activities:lens-distortion] **** ## Lens databases Databases collecting lens geometries are available, for use with programs like this one: http://www.agisoft.ru/products/lens/ ### LensFun database The LensFun database is an open source database of lens models for correcting distortion. It'd be great to get the Canon A490 and SD 1300 series in there, and the format is: You can read more about how to calculate this and generate other types of camera model stuff here: http://lensfun.berlios.de/lens-calibration/lens-calibration.html...
| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| warren | "Hi, i dug into the code a bit and found the section I think we need to modify, but it's WebGL, and relatively obscure: https://github.com/jywarren..." | Read more » | almost 8 years ago | |||
| warren | "Indeed, i used Scott's posted images and got the same issues. But then I tried cropping them to square, and re-running them, using these settings:..." | Read more » | almost 8 years ago | |||
| warren | "Cool, thanks. I took a pic of a grid with my Mobius (an old one, i'm not actually sure of the lens) and got this: I couldn't get a perfect undis..." | Read more » | almost 8 years ago | |||
| eustatic | "See https://publiclab.org/notes/eustatic/11-11-2014/a-method-for-distorting-mobius-action-cam-imagery-in-gimp-foss " | Read more » | almost 8 years ago | |||
| warren | "Update: I added full-resolution, and also made it so that if you drop a succession of images onto it, it adds them below in a kind of 'gallery' -- ..." | Read more » | almost 8 years ago | |||
| tonyc | "Pat, we are going to be getting samples of Mobius cameras from the factory, preinstalled with 6mm and 8mm lenses. Hoping to be able to sell these t..." | Read more » | almost 9 years ago | |||
| tonyc | "Pat, we have an option to have different lenses installed at the factory. They are asking for a sample lens, and specs on what we'd want to have in..." | Read more » | almost 9 years ago | |||
| patcoyle | "In the YouTube, BrainExploder provides this link to 12mm lens: 12mm: http://www.amazon.com/gp/product/B008... An 8mm unit is shown at: http://www...." | Read more » | over 9 years ago | |||
| RQ-05 | "Wow...great stuff! I have been looking for different lenses for my mobius. I tried Prism Stowaway Delta but didn't see any lenses there. Can you gi..." | Read more » | over 9 years ago | |||
| pswigert | "Hi Gerald. I'd be happy to chat with you about the project. Shoot me a note at peter.swigert@berkeley.edu! " | Read more » | over 9 years ago | |||
| geraldmc | "Nice work Pat. Is there a way to learn more about the initiative mentioned and Peter's work? For a deeper dive into fisheye, here's a pdf link to ..." | Read more » | over 9 years ago | |||
| pswigert | "Excellent post, Pat! It's been great talking to you about different technologies and approaches for mapping. Glad we had a chance to fly the Phantom. " | Read more » | over 9 years ago |