Is Fisheye Removal Possible?

[budwzr]

I have a GoPro, and sometimes I wish the fisheye could be removed because it's too much, but I don't want to crop it and lose resolution or end up playing the cropped video at a smaller size.

[poisondeathray]

after effects

I think there are some stickies on how to do it in the go pro forum with AE

eg
http://forums.adobe.com/message/3739820

Avisynth has a "defish" plugin as well, but I've never tried it
http://forum.doom9.org/showthread.php?t=152860

[dragonkeeper]

Check this forum out, it demonstrates methods to remove fisheye and other annoyances.

[budwzr]

Check this forum out, it demonstrates methods to remove fisheye and other annoyances.

Hell yeah, homefrog! Thanks

[manono]

VC Mohan's DeBarrel filter for AviSynth should be able to do it:

http://avisynth.org/vcmohan/DeBarrel/DeBarrel.html

[budwzr]

VC Mohan's DeBarrel filter for AviSynth should be able to do it:

http://avisynth.org/vcmohan/DeBarrel/DeBarrel.html

I don't know how to script

I do have MeGUI, but I only know how to use one filter to make 60p interpolated from 30p.

[yoda313]

I don't know how to script

I feel your pain! I know I've been led by the hand on my limited script experience when I dived into some sbs to anaglyph conversions awhile back.

I wanted to let you know there is a download at the bottom of the page on the debarrel link - it contains the html file copy of the website and a dll file. I believe that is to aid you in the process. I'm not sure how that works either but just that there is more info available.

Perhaps a kind soul on this website will be able to give you a briefing on scripting.

Edit - out of curiosity I digged up this link:

http://www.afterdawn.com/guides/archive/avisynth_tutorial.cfm

I should invest some time in it myself. I really only have a sub-sub-sub beginner understanding of avisynth and its true potential. This should be a good place to start for us uninitiated neophytes.

edit - this program says it requires .net framework 1.1 to install. I just got a bunch of updates done for Vista Home Premium - the computer I'm currently typing at - I thought the newer .net was included in Vista? I have service pack 2 for home premium fy. Hmm....

[budwzr]

I don't know how to script

Perhaps a kind soul on this website will be able to give you a briefing on scripting.

I installed Avisynth, but I can't find it, hahaha.

[yoda313]

I don't know how to script

Perhaps a kind soul on this website will be able to give you a briefing on scripting.

I installed Avisynth, but I can't find it, hahaha.

I don't know if you caught my edits in time before posting:

http://www.afterdawn.com/guides/archive/avisynth_tutorial.cfm

There is a guide here for avisynth. However I can't seem to install it because of a .net requirement. I'm gonna check to see what version of .net I have on my vista pc.

I think there should be some other tutorials out there for avisynth. Unfortunaley there was another tutorial listed in the guides section but the link was dead.

[budwzr]

OK, thanks Yoda, I found everything I need to know.

I guess nobody here actually knows how it works.

[yoda313]

Thats good.

Actually as an fyi I actually have .net version 4 installed but for some reason that avsedit program is insisting on 1.1. I'm not changing it for one program. I'll leave it as it is.

I'll keep that link handy should I need something from it later.

[budwzr]

I'm gonna remember who failed to help me when they want to learn how to make this

[poisondeathray]

Avisynth is just a frameserver. Open a file in notepad, type the commands in. You start with a source filter (to load the video), then the filters come after . You can preview the scripts in vdub or avspmod, and many media players will play avs scripts

eg.

AVISource("PATH\video.avi")
SomeFilter()

http://avisynth.org/mediawiki/Main_Page#New_to_AviSynth_-_start_here
http://avisynth.org/mediawiki/First_script
http://avisynth.org/mediawiki/Getting_started
http://avisynth.org/mediawiki/Filter_introduction
http://avisynth.org/mediawiki/Script_examples


I haven't used defish or debarrel before, but they come with documentation and instructions

[budwzr]

OK, you cut out some popcorn pieces and a popcorn box from Google, and shoot 'em out a particle emitter.

[poisondeathray]

FIshEye removal

[budwzr]

Hehehe

[poisondeathray]

Get the defish plugin

LoadPlugin("PATH\defish.dll")
FFMpegSource2("PATH\Fisheye.mp4")
AssumeFPS(30000,1001) #this is because ffms2 sometimes gets the framerate slightly off
ConvertToRGB32() #req'd for defish, I'm using Rec.601 for this example, but you usually use Rec.709 for HD footage
defish(fov=85)

Original




Defish(fov=85)





Defish(fov=85, scale=0.7)




When you "undo" a barrel distortion or fisheye, you are left with "gaps" - areas than were never recorded. Most plugins will automatically "zoom in" to eliminate the black areas, but you're left with softer footage, and less field of view . You can use defish with scale to control the amount of zooming

(Get the pun??? "Defish with scale" hahahha!!! )

This plugin doesn't have an center offset parameter - in your footage the center isn't actually in the center, so the distortion and correction are skewed (notice the objects on the left of the frame are more distorted than the right)

Other FX programs can actually motion track background objects like the ground to (almost) automatically fill in the gaps, and there are other compositing "trickery" that you can do (e.g. the sky is easy to fill in for this particular) - so you try to get the "best" of both worlds - less zoom in , and no black gaps

Most people add sharpening afterwards (because the scaling and undistortion cause softness, especially on the periphery) - but the "ideal" way to do it is through a gradient - so objects in the center are less sharpened, objects in the periphery are sharpened to a larger degree

Of course you have to fiddle with the parameters and settings to get best results

[budwzr]

Nice work and explanation, thanks.

I ran across this free software called Hugin that does this stuff on stills, but not video.

Given the results above, the Vegas "Deform" tool is a lot easier to use and seems to accomplish the same result, gaps that need to be cropped.

OK, thanks.

[budwzr]

Vegas Deform gave me this:



I think repairs like this can be used with crop, then played in their own space, but not zoomed to full rez, so the usefulness is limited.

[GoProWarrior]

There is also the plugin for Virtualdub called Barrel distortion correction from Emiliano Ferrari that can do the job.
It gives a good image quality without loosing too much on the sides.

Here is an explanation on how to use it: http://skisoo.com/blog/en/2012/how-to-remove-the-fisheye-effect-from-gopro-hero-2-vide...free-software/

[jagabo]

Actually as an fyi I actually have .net version 4 installed but for some reason that avsedit program is insisting on 1.1.

Unlike most libraries which have backward compatibility, each version of .net is separate. A program that requires .net 1.1 will not run on .net 2, 3, or 4.

[smrpix]

Nope Budwzr, didn't work. They found it again!

http://www.google.com/hostednews/ap/article/ALeqM5itAwBtxMa8_eIsnWTMLwvFfKrXZA?docId=2...223de06da1fd6b

[budwzr]

What the hell is that? Jeezuz Kroist!

[budwzr]

There is also the plugin for Virtualdub called Barrel distortion correction from Emiliano Ferrari that can do the job.

Thanks, I'm looking at that. This one too.

VC Mohan's DeBarrel filter for AviSynth should be able to do it:

http://avisynth.org/vcmohan/DeBarrel/DeBarrel.html

[altarvic]

Has anyone tried Defishr or ProDRENALIN? Both tools from proDAD and designed for use with action camera footage (including GoPro).

[theewizard]

did you ever think about taking it apart and changing the lens