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Lens Distortion
activity:lens-distortion

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 "OK, we just did the GitUp 1 -- https://jywarren.github.io/fisheyegl/example/#a=0.989&b=0.98&Fx=0.05&Fy=0.14&scale=1.036&x=1.00..." | Read more » almost 3 years ago
stevie "This is Awesome!!! Just getting to test it out now. Thanks so much for putting this together and posting the walk through :) " | Read more » about 4 years ago
warren "Folks on the #nasa #aren project sent in this image and we corrected it on the call: Lightdow LD6000 WiFi 1080P HD Sports Action Camera https://w..." | Read more » over 4 years ago
warren "Ah! And i realized another feature i forgot to mention -- you can now see the model of camera used to take the photos, which is extracted from the ..." | Read more » over 4 years ago
warren "Thanks, Pat. Also, I found a good example of lens distortion with straight lines (a parking lot) on MapKnitter just now: https://mapknitter.org/ma..." | Read more » over 4 years ago
patcoyle "Thanks Jeff, I did my test on iMac (24-inch, Early 2009) with Graphics shown as: NVIDIA GeForce GT 120 256 MB. " | Read more » almost 5 years ago
warren "Awesome! I'll just copy in your notes so they're searchable on the site: I saw Jeff Warren’s note, so gave it a try. I’ve used some of the other t..." | Read more » almost 5 years ago
patcoyle "Nice Jeff. Here is a replication, but didn't think it warranted a note, see results in slides " | Read more » almost 5 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 » about 7 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 » about 7 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 » about 7 years ago