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[mediacapture-main] Add device calibration and position (intrinsics and extrinsics) to MediaTrack

From: Aleksandar Stojiljkovic via GitHub <sysbot+gh@w3.org>
Date: Fri, 11 Nov 2016 13:04:22 +0000
To: public-media-capture@w3.org
Message-ID: <issues.opened-188755960-1478869461-sysbot+gh@w3.org>
astojilj has just created a new issue for 
https://github.com/w3c/mediacapture-main:

== Add device calibration and position (intrinsics and extrinsics) to 
MediaTrack ==
In mediacapture-depth extension, we need access to capture device 
(color or depth camera) intrinsics and extrinsics.
This is the data that enables compensating camera distortion and 
mapping pixels from different camera's capture.
Further explanation is in the [comment 
here.](https://github.com/w3c/mediacapture-depth/issues/110#issuecomment-259842834).
Naming and semantics of the data is fairly standardized among 
different device vendors:
[Microsoft 
Kinect2](https://msdn.microsoft.com/en-us/library/microsoft.kinect.kinect.cameraintrinsics.aspx),
 [Android 
Tango](https://developers.google.com/tango/apis/c/reference/struct/tango-camera-intrinsics)
 and [Intel RealSense 
cameras](https://github.com/IntelRealSense/librealsense/blob/master/include/librealsense/rs.h#L264)
 define:

**Intrinsics:**
double focalLengthX // used to calculate horizontal field of view 
double focalLengthY // used to calculate vertical field of view 
double principalPointX // coordinate on the image, in pixels.   
double principalPointY // coordinate on the image, in pixels.
string distortionModel; // name of distortion model, several different
 in use but with similar logic.   
double distortionParameters[5] // Kinect names 3 parameters.
width // already in MediaTrackSettings
height // already in MediaTrackSettings

**Extrinsics:**
Position of cameras to common reference position (vector with origin).
 Used for projecting from one camera space to another.
double[4] rotation, // quaternion defining rotation
double[3] translation // vector defining translation

MediaTrackSettings looks like it could fit these too, but we could 
also define additional MediaTrackCalibration or MediaTrackCaptureInfo.

Please view or discuss this issue at 
https://github.com/w3c/mediacapture-main/issues/416 using your GitHub 
account
Received on Friday, 11 November 2016 13:04:30 UTC

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