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Difference between revisions of "Calibration"

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(started calibration page)
 
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===Things to calibrate===
 
===Things to calibrate===
 
*nonlinear effects for both cameras:
 
*nonlinear effects for both cameras:
**radial distortion   
+
**radial distortion  [http://en.wikipedia.org/wiki/Distortion_(optics)#Radial_distortion On Wikipedia]
**tangential distortion  
+
**tangential distortion (sensor chip not parallel)
**rotational errors
+
**rotational errors (sensor rotated on image plane)
 
*Intrinsics matrix for both: Video camera & Depth Camera
 
*Intrinsics matrix for both: Video camera & Depth Camera
 
*Extrinsics matrix for both: Video camera & Depth Camera
 
*Extrinsics matrix for both: Video camera & Depth Camera
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===Questions to answer:===
+
===Questions to answer===
 
* Which parameters change much between different devices,
 
* Which parameters change much between different devices,
 
* Which change minor (and can be set constant?)
 
* Which change minor (and can be set constant?)
 
* Are routines to calculate parameters needed, or could a seperate application be used (based on OpenCV, for example)
 
* Are routines to calculate parameters needed, or could a seperate application be used (based on OpenCV, for example)
 
*
 
*
 +
 +
===Links===
 +
* Calibration based on libfreenect and rgbdemo (Nicolas Burrus):
 +
** http://nicolas.burrus.name/index.php/Research/KinectRgbDemo
 +
** http://nicolas.burrus.name/index.php/Research/KinectCalibration
 +
* [http://www.xboxgaming.co.za/news/the-secret-of-kinects-calibration-revealed/ About Xbox calibration]

Revision as of 19:28, 2 December 2010

Calibration

This page shall help to define a calibration procedure. Please add your knowledge.

Things to calibrate

  • nonlinear effects for both cameras:
    • radial distortion On Wikipedia
    • tangential distortion (sensor chip not parallel)
    • rotational errors (sensor rotated on image plane)
  • Intrinsics matrix for both: Video camera & Depth Camera
  • Extrinsics matrix for both: Video camera & Depth Camera
  • Registration of both cameras
    • Rotational tolerances
    • ?


Questions to answer

  • Which parameters change much between different devices,
  • Which change minor (and can be set constant?)
  • Are routines to calculate parameters needed, or could a seperate application be used (based on OpenCV, for example)

Links