[OpenDroneMap-users] Newbie focal length override

[Stephen Mather]

Hi Howard,

Welcome! Try forcing the ccd size. Did you do any barrel distortion
correction first? This is something ODM doesn't do well (yet) as it only
does 3-parameter (not 6-parameter) distortion corrections. This is
something that needs worked into the toolchain in the near future.

References:

There's a calibration class up here from Cole:
https://github.com/colek42/TrackIt/blob/master/catkin/src/stabilize/src/calibrate.py

plus Alex' work here (GoPro2 only, but a good example):
https://github.com/wildintellect/lenscorrection

Finally, see Jan Erik Solem's work here for a full calibration solution:
http://www.janeriksolem.net/2014/05/how-to-calibrate-camera-with-opencv-and.html

Once you've done the correction and cropped, you'll need to estimate the
ccd size of the cropped area, I think, and then it should feed in just fine.

Cheers,
Best,
Steve





On Sun, May 10, 2015 at 1:20 PM, Howard Butler <howard at hobu.co> wrote:

> All,
>
> So I have a 2 min 720 video from a GoPro Hero 3 Black that I ripped out
> 126 images out of using ffmpeg. I want to attempt to start with that.
>
> When I attempt to run them, I get the following error:
>
> > no CCD width or focal length found for image-100.jpg - camera: “ "
>
> Of course this is a FAQ, but my pattern isn’t quite the same. If I try
> —force-focal 5.76, which is the GoPro entry in the json file, it still
> blows up.
>
> Ideas?
>
> Thanks,
>
> Howard
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