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major corner pin issues!!!
I have been trying to track this footage for days. Looks EZ. Semi travels in front of camera, rt to lt., slight angle away from cam. I’m using corner pin and the bottom is lining up for the most part (until a pickup passes in front of the semi) But the top 2 pins are drifting and bouncing and annoying the hell out of me. I’ve tried pre-processing the footage (levels, exposure, etc…) I’ve tried so many changes in the ‘Options’ that i’m going back over stuff I tried 4 days ago.
HELP!!!
here’s a link to the footage for those brave enuff to look- (it’s compressed to .mp4 for size sake)https://homepage.mac.com/frankcollins/movieTESTS/iMovieTheater77.html
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4 Replies
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What you might try is tracking the top left and right corners of the truck and then track the 2nd black notch down the back of the truck as the bottom right and then the top of the door as the bottom left point, then move the track point + curson to the bottom corner of the truck side for the 2 points just above.
Basically this will allow you to track points that seem to stay in frame and create point data for the correct points for the corner pin effect.
Let me know if this makes sense,
Andrew -
I know how you feel, I’ve dealt with similar stuff myself, mainly with blurring out license plates in some footage.
Anyways, what I would do is track the footage all the way up until the foreground truck starts to mess with your trackers, then go to the end of the footage and track it backwards until the foreground truck messes with your trackers as well. Then, I know it might suck, but you might have to go in and move the tracker by hand or at least the corner pins by hand for those frames where the truck is obstructing. It’s only like a second and half if that.
Trust me, this ain’t that bad, try working with hand held footage that is all over the place!!! I almost went insane!! Good luck, hope that helps.
–Jonathan
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One other quick thought after looking at the footage and fooling around with a tracker real quick, if you look at the behavior of the tracker, it pretty much follows a straight line. And they all will, since the camera is locked and the truck is going in a straight line. Really all you have to do is find the vanishing point of the truck and you could make guide lines for that vanishing point and use those as a means to animate the corner pins along. Does that make sense?
–Jonathn
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HI since it is locked off and the motion is pretty linear you could just hand track it. One tracker point at a time set to raw and then combined into one 4 point tracker. When you do difficult corner pin tracks always track the points one at a time and then combine them. If you are dead set on using a tracker you might consider tracking it in Shake and converting that data into AE formatting using excel or textmate. The shake tracker is way better.
PeteWednesday; August 2, 2006
10:21 AMbarxseven.com
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