sometimes my 3d plane to calibrate two kinects are a bit off, for a some unknown reasons to me, my questions is, is there any way to manually move a camara for a little twitching or will it be implementedin new releases? Thanks!

You can adjust camera position at the Scene tab. However, it is not recommended to do after calibration, because you will never have more accurate results with manual positioning than with automatic.
You'd better concentrate on improving you calibration procedure. Do you give the calibration board enough movement within the capture area - back and forth, side to side? Is it properly recognized in the view of both sensors most of the time? How many good frames are reported after the calibration process is complete? It should be at least 100-200.

normally i give it 180-200 frames to calibrate, but now this didn't know, should i move the calibration plane during this frame? i tough it was supposed to be still...

Absolutely not. You should move it at least in a half-meter range for good calibration results. Also make it tilt and yaw slightly, holding its sides parallel to the floor. And ensure its corners are not in touch with your body - hold by the middle of a side, not a corner, in a straight arm.

More motion is better--holding the board absolutely still does not give the tracker enough useful information to reconstruct the camera positions. And especially include back to front motions--this tells the tracker which camera configuration you're using. Move the board smoothly though--jerky motions may cause issues because Kinect is only 30fps and the recorded data is not necessary in sync to the exact frame all the time.

FYI, I typically record about 400 to 500 frames for calibration. Shorter sample (200 frames) is okay but more frames improves accuracy. That said, any more than 500 is probably overkill and unnecessary.

G.

_________________
Greenlaw
Artist/Partner - Little Green Dog | Demo Reel (2017) | Demo Reel (2015) | Demo Reel (2013)


Watch a one minute excerpt on Vimeo now!

Thanks! well, last sunday we recorded a lot of video... ashame, but it's only a fraction of the whole for a project, really appreciate the help! in the next sessions we'll do it right!

Yes, it's a horrible feeling to lose an entire day of shooting because of poor calibration data. In the early days of iPi mocap, this happened to me often.

Thankfully, I learned from the experience though. If I'm recording a lot of motion, I will do a second calibration at the end of session, on the chance that a camera go bumped during the session. If it's a very long shoot, I may do some calibration videos during the shoot.

When running iPi Mocap Studio with dual Kinect on a desktop computer with a good graphics card, the entire calibration process only takes a couple of minutes, so I will run the calibration before shooting motion to be sure I have it.

If I'm using natural room lighting during daylight hours, I also like to run a new Background Evaluation from time to time. Natural lighting can change quickly, especially in the morning, which will affect background subtraction. Just something to keep in mind.

G.

_________________
Greenlaw
Artist/Partner - Little Green Dog | Demo Reel (2017) | Demo Reel (2015) | Demo Reel (2013)


Watch a one minute excerpt on Vimeo now!