Hi,
It is not my first attempt at tracking, but I've never stumbled across anything like it, namely, after doing a 4 point track in MatchMove, the image that I try to composite into the picture is shaking rapidly. I tried to increase the contrast of the background image but it didn't work, so I don't know what I'm doing wrong (whether it's the tracker box or its settings).
Here is the screenshot of the tracked image, with 4 white markers beneath the rear passenger window:
http://img372.imageshack.us/my.php?image=picture1sn8.jpg
And here's the tracker itself:
http://img53.imageshack.us/my.php?image=picture2xr2.jpg
Should I readjust the tracker box?
P.S.
The shot is a DV clip, 720x576.
QUOTE(hubert19 @ 07/06/08, 09:40 PM) [snapback]287955[/snapback]
P.S.
The shot is a DV clip, 720x576.
interlaced or progressive?
if the first, you'll want to deinterlace for the track, then decide if you want to re-enable interlaced rendering for the final composite.
if it's progressive, try making the inner box a bit bigger and denoise/deartefact or simply blur the clip somewhat. play around with a one point tracker until you found a way that you get good results, then use the same settings for 4 points.
in worst case, use several 4 point trackers and average them and link the matchmove to that..
++ c.
ps: i generally avoid the matchmove node because i've read about some bugs, not sure if that's still valid, but using a stabilize node and switching it to matchmove should be save.
pps: and tell the camera operator to reduce sharpening a bit next time ![]()
One more thing - is there any other way to average a 4 point track besides tracking from first frame to last and backward?
by experience the 4 point track is generaly a mess.
Use a stabilize node with 2 points, activate the rotation and scale if you think there is in your scene.
Then use the match option of the stabilize that's it
sometime, tracking on the track node give better results, then copy past the track info in your stabilize node.
I never use the matchmove node, and i track really often.
for average or more smoothing a track, go in the curve editor after activated curves on x and y of you track, select your cuves.
there is 4 round buttons on the left under the curves grid, an other round one is just after, called apply operations
you can use it to smooth, scale.... that can help jittery track
or try boujou and import the tracks
cheers
Jaz
i would have to agree with fxnurbs...4 point track is a horrible way to do it. here is the actual tracking method i use:
for a 4 point, i use 4 actual tracker nodes instead of tracks inside those nodes. i track out 1 point per node.
after i finish getting all 4 tracks the way i want them, i then use a corner pin node on my object i want to place in the scene. on the 4 points they give you in the scene just use the x,y values from each tracker that you used. for example:
Tracker1.track1X (this would go in the X value for one of the corners)
Tracker1.track1Y (this would go in the Y value of the same corner)
Tracker2.track1X (this would go on your next corner X)
Tracker2.track1Y (this would go on the next corner Y)
use the process for the other 2 corners by just typing them in the value field for each. once you have image doing the motion you want, just use a move2D node to position it in the scene exactly where you want.
i hope this works out for you.
