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Tweaks to get good results in camera tracker?

Dec 29, 2012 5:12 PM

Today I shot very simple footage with my Canon 60D DSLR to use as practice for inserting 3D objects using Element 3D. Basically the footage is handheld, camera forward while I'm walking towards the front door, opening it, which gives a view of the front yard and the porch in the foreground. I keep walking past the porch and then rotate the camera towards the right, then tilt upwards a bit. After that, I rotate the camera to the left. The plan was to insert 3D objects to both left and right.

 

Usually when I use the CS6 camera tracker I get pretty good results, but this time I'm getting "analysis solve failed" on all four takes. Or, it stays on "Solving camera" for minutes on end, when these are clips shorter than a minute and usually that takes no time to solve.

 

I thought this footage was going to be easy to track because last weekend I shot some footage also in the front and back yards and it tracked perfectly, especially because there are lots of dry leaves that provide good points of reference. But today it's just not working, even if I do a detailed analysis. Note that the footage is properly exposed, and there's plenty of detail

 

Are there any tweaks I can make? I tried adding levels to add more exposure and it didn't help. Sharpening also didn't help. I'll keep trying different filters (always before the camera tracker one), but does anybody know of a better way (without buying a 3rd party tool) or a specific filter that will give me good results?

 

Thanks,

 

Sebastian

 
Replies
  • Currently Being Moderated
    Dec 29, 2012 6:16 PM   in reply to Sebasvideo

    Im very curious as to why you are having such problems with your footage.

     

    You are covering a lot of territory with your move. Try breaking up the shot and using just the portion where you walk up to the porch and get out before you pan right. See if you get any different results.

     

    If you want to make it accessible  it might make it easier to analyze why its failing.

     
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  • Currently Being Moderated
    Dec 29, 2012 9:08 PM   in reply to Sebasvideo

    As Tom says, you should break this up into pieces.

     

    The simple pans/rotations/tilts won't have any actual 3D camera movement in them; they are essentially 2D tracking shots since there is no parallax from the camera moving.

     
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  • Currently Being Moderated
    Dec 30, 2012 9:14 AM   in reply to Sebasvideo

    As Todd said, a shot that is panned doesnt give the tracker the parallax info needed to do a 3D track. Ive seen tutorials where you can kind of fake object placement in a tripod (static panning) type shot, but not when it is part of a long sequence of camera moves that may preceed it.

     

    The only thought I have is to place a reference obejct where you want your object to be and use Mocha to object track. Then place your object over the reference one in AE. It might do better then using the 3D cameratracker.

     

    Either that or while doing your pans also move the camera thru 3D space to give the 3D cameratracker the info it needs.

     

    I have not come across any preferred shutter speeds, but I have seen how the rolling shutter issue with DSLR cameras can throw a camera track off.

     
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    Dec 30, 2012 10:24 AM   in reply to lasvideo

    I agree with Tom that mocha is better for the 2D tracking parts of the shot.

     
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