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Making Things See
book

Making Things See

by Greg Borenstein
January 2012
Beginner to intermediate content levelBeginner to intermediate
440 pages
17h 11m
English
Make: Community
Content preview from Making Things See

User Detection

As I indicated, the process begins when a user enters the view of the depth camera. When the user appears, OpenNI recognizes that a user is present. At this point, the user has not been calibrated and his joint data is not available. OpenNI basically has a hunch that someone is moving around within the view of the depth camera. OpenNI calls our sketch’s onNewUser function.

Depending on the conditions of the scene, this can happen sooner than you might expect. OpenNI can detect the presence of a user even when not much of his body has entered the frame. For example, Figure 4-2 shows a screen capture from this sketch that was taken at the moment OpenNI first detected me. You can see that I’ve barely entered the frame on the left. My ...

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Publisher Resources

ISBN: 9781449321918Errata