MATLAB IMAGE ACQUISITION TOOLBOX - RELEASE NOTES Uživatelská příručka stáhnout pdf (Strana 336)

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14 Using the VideoDevice System Object

14-8

To create a System object using the Color sensor:

vidobjcolor = imaq.VideoDevice('kinect', 1);

To create a System object using the Depth sensor:

vidobjdepth = imaq.VideoDevice('kinect', 2);

The Depth sensor returns skeleton metadata. To access this, you need to add a second

output argument for the step function. The Color sensor works the same way as other

devices. So acquiring a frame using the Kinect Color sensor is done as shown here:

imageData = step(vidobjcolor);

where imageData is the frame acquired if vidobjcolor is a System object created with

Device 1, the Kinect Color sensor.

The Kinect Depth sensor requires a second output argument, as shown here:

[depthData metadata] = step(vidobjdepth);

where depthData is the frame acquired if vidobjdepth is a System object created with

Device 2, the Kinect Depth sensor, and metadata is the skeleton metadata returned

with the frame.

These metadata fields are related to tracking the skeletons. The metadata is returned as

a structure that contains these parameters:

IsPositionTracked

IsSkeletonTracked

JointDepthIndices

JointImageIndices

JointTrackingState

JointWorldCoordinates

PositionDepthIndices

PositionImageIndices

PositionWorldCoordinates

SegmentationData

SkeletonTrackingID

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