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Track and Corner Pin in Mocha

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Darren GrimsleyTrack and Corner Pin in Mocha
by on Mar 20, 2013 at 3:16:08 pm

I'm exploring Mocha for the first time and I just can't get it to track solidly. It may just be that it's difficult material to track and corner pin. The surface doesn't have much detail and I only ever have two corners on screen and one of those corners is obscured part of the time.

I'm pretty inexperienced in motion tracking, so maybe someone out there can give me a clue as to what I'm missing?

Sample:








Thanks,
Darren


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Ross ShainRe: Track and Corner Pin in Mocha
by on Apr 2, 2013 at 7:55:06 pm

This shot has "very little" detail to track. If you can upload it for me, we can take a quick look. If anything can track it, it will be mocha.

You can always get in touch with Imagineer support here:
http://www.imagineersystems.com/contact_form

Ross Shain
Imagineer Systems
http://www.imagineersystems.com


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Darren GrimsleyRe: Track and Corner Pin in Mocha
by on Apr 2, 2013 at 8:20:00 pm

Hi Ross,

Thanks for taking the time to reply to my question. I've uploaded a sample clip for you to look at. It has "goodwill" written across the box which may give you a little more to work with as the clip you saw already had the replacement graphic on it.

They never had plans to track and remove the writing while shooting, just a request that was made after the fact...I guess that's often the case though.

Here's the link to the footage.
https://drive.google.com/folderview?id=0BzIc8XKSjIifR3FZbmpHMXFzdkU&usp=sha...


Thanks,
Darren


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Ross ShainRe: Track and Corner Pin in Mocha
by on Apr 2, 2013 at 9:43:18 pm

I was able to get a very good solve in mocha after some experimentation.

First, I believe your clip has pulldown? Make sure to remove the pulldown so you are tracking in frame based material. mocha can do this on import, but I prefer to send mocha clean frames and personally would remove in AE.

Next I created a tight track shape around the text in center.

Then using the Add X-spline to layer button I added another shape to the track layer focusing on the upper left corner. This detail helps the track be more solid.

Last, I turned min % of pixels to use to 100 and tracked with shear on, perspective off.

I know this seems like a lot of tweaks, but in a few minutes I was able to greatly reduce the drifts that I saw in your preview.

All the best,
Ross

Ross Shain
Imagineer Systems
http://www.imagineersystems.com


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Darren GrimsleyRe: Track and Corner Pin in Mocha
by on Apr 3, 2013 at 7:04:32 pm

Thanks a lot for going to the trouble for me. I will test this out this afternoon.

Thanks,
Darren


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