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  1. #1
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    Go pro- removing fisheye?

    I noticed that some videos shot with the go pro hero aren't in fish eye. Can anyone explain this trick to me? Go pro doesn't sell a standard lens, what's the trick?

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    Quote Originally Posted by allenrl View Post
    I noticed that some videos shot with the go pro hero aren't in fish eye. Can anyone explain this trick to me? Go pro doesn't sell a standard lens, what's the trick?
    Not sure if there is a trick but there are some third party flat lenses vendors out there, For example:
    http://www.makospearguns.com/product-p/mgphl.htm

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    I use this one:
    http://ragecams.com/shop/product_inf...d8db773fa7031d

    Does a decent job, but the lens is a bit soft. The GoPro's sensor is not the highest quality, so the new lens can show slight imperfections in the flatness of the sensor. Also know that the smaller FOV amplifies camera shake.
    You have to take the camera apart to change the lens. It's not difficult, just be very careful screwing the new lens on. The threads are plastic, very fine, and easy to cross-thread.

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    You can also fix the fisheye effect using camera calibration techniques. Basically you have to run some software which calculates the distortion of the lens by showing it a chessboard with all straight lines on it. Then the camera can see that the lines are curved and calculate what it'd take to make them straight again. Unsure if there's any software which does it easily though - it's generally used in machine vision afaik.
    Uses a Mega2560 with AQv2.0 shield, KDA20-22L motors with 25A Plush ESCs, 3S 5Ah batteries, 900MHz Vtx + CL antennas

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    Senior Pilot UndCon's Avatar
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    it is usually called barrel distortion and can be removed with VirtualDub and a plugin (only 32bit atm)

    It works pretty OK and I have been messing with it earlier.

    Here is a sample:

    Deshaker test
    http://www.youtube.com/watch?v=6ma96EZhdt8

    Barrel distortion
    http://www.youtube.com/watch?v=Ope3ZU7i9P4


    //UndCon

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    remove fisheye effect in gopro videos

    The fisheye effect can be removed in video editing software. Final cut pro and abode premiere have a plugin for that.
    There is a plugin called Barrel distortion correction for the free software virtualdub that can do it. Here is a explanation: http://skisoo.com/blog/en/2012/how-t...free-software/

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    Quote Originally Posted by UndCon View Post
    it is usually called barrel distortion and can be removed with VirtualDub and a plugin (only 32bit atm)

    It works pretty OK and I have been messing with it earlier.

    //UndCon
    Quote Originally Posted by goprowarrior View Post
    The fisheye effect can be removed in video editing software. Final cut pro and abode premiere have a plugin for that.
    There is a plugin called Barrel distortion correction for the free software virtualdub that can do it. Here is a explanation: http://skisoo.com/blog/en/2012/how-t...free-software/
    =P
    push the envelope, watch it bend

  8. #8
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    Um, i put my Hero 2 on 1080p narrow, fisheye gone and all pixels intact
    Fleet: AQ32 Y6 FPV, Mega v2.1.2 FPV quad, Blade mcp-X, 6' Skywalker 1900, 20" Flying wing, 100 mph 1:10 car
    Gear: GoPro Hero 2, Gopro hero 3 Black, Fatshark Predator, 600mw 5.8, 9XR, 850mw 1.2, scherrer lrs
    Carnage: This year: 1.2 TX, several ESC's, mostly due to polarity.. CHECK YOUR BATTERY LEADS!!

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    Thumbs up

    Take a look at ProDRENALIN tool for GoPro camera users. It can remove fisheye and stabilize the video.


 

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