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Old Jan 04, 2011, 03:46 PM
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GGoodrum's Avatar
South Orange County, CA
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GoPro "fisheye" correction technique...

Like many, I've been irritated at the fisheye effect that the GoProHD videos always have, so I decided to try and do something about it. Recently, I upgraded from Sony Vegas 7 to Vegas Pro 10. It is almost unrecognizable, in terms of all the "stuff" they've added, but soon enough I have been able to reacquaint myself with most of the basic features. I then started looking for ways to manipulate the video, and got buried in a plethora of filters/effects. As it turned out, all I needed was the basic "Deform" filter, and then the Pan function. In the short test video below, the first half is the "raw" version, and the second half has the "corrected" version. Please ignore the smudge on the left part of the frame. This is a remnant of a mud-planting I made the other day, when I backed my AR.Drone into a palm tree, in the front yard.

Anyway, in the first half, you can see how the hill line on the horizon "bends" quite a bit, as the camera is moved up and down. In the corrected version, the hill line remains relatively straight.

Fisheye Correction Test-03.mov (1 min 36 sec)


Attached are a couple screen shots of the Vegas 10 filter/pan settings. The correction is not perfect, and I'm sure I can get it closer with some further tweaking, but for a quick'n dirty way to eliminate the fisheye effect, this works pretty well. Also, this is for the GoProHD's 1080p mode (r5...), which has a FOV of 127 degrees. The filter values would have to be tweaked higher for the 720p mode, which has a FOV of 170 degrees.

-- Gary
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Last edited by GGoodrum; Jan 04, 2011 at 03:51 PM.
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Old Jan 04, 2011, 03:54 PM
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Near Austin
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Wow! I'd say that's a pretty dramatic difference! That bowed skyline is irritating as it can be. I have been waiting for someone to come up with a "slip on" lens that would correct that, but it looks like there may be a software alternative!

Thanks for sharing!

Gene
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Old Jan 04, 2011, 04:54 PM
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GGoodrum, that is awesome, I have been looking for away to get rid of the Fish Eye and I already have Sony Vegas Pro 10.
I love you man, in a AV copter kind of way, which is good.
Thank you
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Old Jan 04, 2011, 05:17 PM
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Wow, that works really well. What effect does it have on the file size? I have sony vegas, its the most mind boggeling software ever. I guess my mind doesn't think the way the programmers do. I end up using windows live movie maker most of the time ( don't laugh too much )

Looks like its time I sat my down and got to learnin' vegas....
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Old Jan 04, 2011, 05:24 PM
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South Orange County, CA
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Originally Posted by Tarro View Post
GGoodrum, that is awesome, I have been looking for away to get rid of the Fish Eye and I already have Sony Vegas Pro 10.
I love you man, in a AV copter kind of way, which is good.
Thank you
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Old Jan 04, 2011, 05:30 PM
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I have been working with the Deform filter and it is easy, I just have to see how well it plays with the Stabilization filter.
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Old Jan 04, 2011, 05:31 PM
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South Orange County, CA
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Originally Posted by signguy View Post
Wow, that works really well. What effect does it have on the file size? I have sony vegas, its the most mind boggeling software ever. I guess my mind doesn't think the way the programmers do. I end up using windows live movie maker most of the time ( don't laugh too much )

Looks like its time I sat my down and got to learnin' vegas....
It has zero effect on the file size, but will lengthen the render time a bit.

Vegas is pretty intuitive, once you get into it. I'm still trying to figure out most of the bells and whistles, but Ive got the basics down now. It took me awhile to figure out things like picture-in-picture, but it is surprisingly easy. That's why I nknew there had to be a fairly easy way to do this fisheye thing.

-- Gary
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Old Jan 04, 2011, 05:43 PM
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Too bad it is Windows only. It would be killer on a Mac.
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Old Jan 04, 2011, 05:55 PM
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Originally Posted by Tahoe Ed View Post
Too bad it is Windows only. It would be killer on a Mac.
You can correct easy in After Effects as well, or export to a sequence and batch correct in Photoshop, which offers more flexibility.
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Old Jan 04, 2011, 06:04 PM
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USA, CA, Thousand Oaks
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That's pretty impressive.

How well doe lens correction work in AE? Also an interesting idea to use Photoshop.
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Old Jan 04, 2011, 06:25 PM
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Australia
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I did a Stabilizing test

http://www.youtube.com/watch?v=8eVXpTCtavI
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Old Jan 04, 2011, 08:00 PM
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Excellent stuff guys, many thanks!

Dan
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Old Jan 05, 2011, 02:02 AM
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Speaking of stabilizing and De-shaking software. Any free ones on the net? Anyone?
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Old Jan 05, 2011, 02:22 AM
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Vegas 10 has a stabilization function, but I haven't tried it yet. I'll give this a try, in conjunction with the deform/fisheye correction.

-- Gary
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Old Jan 05, 2011, 07:37 AM
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Originally Posted by GGoodrum View Post
Vegas 10 has a stabilization function, but I haven't tried it yet. I'll give this a try, in conjunction with the deform/fisheye correction.

-- Gary
The stabilization function works awesome, I use it on all my videos now.
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