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Making sense of calibration
https://forum.ipisoft.com/viewtopic.php?f=5&t=5988		 Page 1 of 1
Author:  AaronC [ Sat Apr 28, 2012 7:46 pm ]
Post subject:  Making sense of calibration
Ok so I've trialed and errored this enough, with no luck to speak of.

I have 2 Kinects, and want to get calibration right.

So I record video, and move the plane around (the 30-90 degree configuration). I get confused in loading video into the studio program. I have a marker, on the floor, directly in the middle where the wall meets the floor, behind me. With the studio grid, I line up the centre line of the grid with that marker, using the orbit and move tools under the scene tab. I do that with both cameras. Is this the right thing to do?

So when I go View>Show depth from all sensors, the sensor renderings of me dont quite match up..

What exactly is required here to get a clean calibration? Whe reviewing the resultant calibration, after processing, the dots flash in not quite the same positions..WHats a reasonable margin of error in reviewing the resultant calibration after processing? The User guide at http://wiki.ipisoft.com/User_Guide_for_ ... figuration Doesn't say what is good and usable and what isnt, it just says to review it.. My dots are mostly green, occasionally red and yellow, but the dots never exactly match position...

Is this a good calibration to move forward from? Please see attached pic. Thanks

http://deepwater3d.com/downloads/IsThis ... ration.jpg

AaronC

PS being able to upload images directly to the forum would be a lot less hassle for forum users.
Author:  vmaslov [ Wed May 02, 2012 10:43 am ]
Post subject:  Re: Making sense of calibration
AaronC wrote:
PS being able to upload images directly to the forum would be a lot less hassle for forum users.

Here you go :)
Author:  Michael Nikonov [ Wed May 02, 2012 2:27 pm ]
Post subject:  Re: Making sense of calibration
AaronC wrote:
With the studio grid, I line up the centre line of the grid with that marker, using the orbit and move tools under the scene tab. I do that with both cameras. Is this the right thing to do?


That does not hurt but also does not help.
Calibration is completely automated with dual-Kinect setup.
You should just choose approximate angle between sensors and click "Calibrate".

http://wiki.ipisoft.com/images/8/8e/Dua ... -start.png

AaronC wrote:
Is this a good calibration to move forward from? Please see attached pic. Thanks
http://deepwater3d.com/downloads/IsThis ... ration.jpg


Most probably this is good calibration.

Kinect's accuracy varies depending on range. It has good accuracy at close range (1 meter or closer) and poor accuracy at long range (4 meters away). If your calibration is off a bit that may be normal.

What drivers do you use?
Please be aware that you can have higher accuracy with Microsoft's drivers (because Microsoft's drivers can use additional calibration information stored in Kinect's firmware). To get Microsoft's drivers working, you may need to remove "PrimeSense driver registration for Kinect" and install Kinect SDK.
Author:  AaronC [ Wed May 02, 2012 7:51 pm ]
Post subject:  Re: Making sense of calibration
Michael Nikonov wrote:

What drivers do you use?
Please be aware that you can have higher accuracy with Microsoft's drivers (because Microsoft's drivers can use additional calibration information stored in Kinect's firmware). To get Microsoft's drivers working, you may need to remove "PrimeSense driver registration for Kinect" and install Kinect SDK.


Hi Michael thanks for all this good info above and allowing attachments.

I have just been using the default iPi recorder install with PrimeSense, and have just now downloaded and installed the Kinect SDK. I uninstalled the PrimeSense driver first using the windows control panel, and now when I run the iPi recording application it still reads the kinects ok, so does this mean I have successfully switched drivers?

Thanks
AaronC
Author:  vmaslov [ Thu May 03, 2012 12:45 am ]
Post subject:  Re: Making sense of calibration
AaronC wrote:
does this mean I have successfully switched drivers?

Used drivers are displayed in braces after camera model name. In case of Kinect with Kinect SDK, camera name should read as:
MS Kinect Sensor (MS SDK)
Author:  AaronC [ Thu May 03, 2012 7:19 pm ]
Post subject:  Re: Making sense of calibration
Brilliant, thanks, we're good to go. Looking forward to V2!

AC
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