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DIGITAL DANCING

DIGITAL DANCING. ETHAN BROWN / KATE RAFTER. What I learned…. SEEING THE WORLD IN THREE DIMENSION. Humans are good at understanding depth from a multitude of cues:. FAMILIAR SIZE. DEPTH PARALLAX. PERSPECTIVE. RELATIVE SIZE. MANY MORE…. STEREOPSIS. OCCLUSION. CONVERGENCE.

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DIGITAL DANCING

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  1. DIGITAL DANCING • ETHAN BROWN / KATE RAFTER

  2. What I learned…

  3. SEEING THE WORLD IN THREE DIMENSION Humans are good at understanding depth from a multitude of cues: FAMILIAR SIZE DEPTH PARALLAX PERSPECTIVE RELATIVE SIZE MANY MORE…. STEREOPSIS OCCLUSION CONVERGENCE Computers: not so much.

  4. INFRARED DEPTH MEASUREMENT: A CLEVER CHEAT • Infrared laser projects a pattern of infrared dots • Depth inferred from multiple cues • Kinect uses proprietary technology developed by PrimeSense

  5. HARDWARE Occipital Microsoft STRUCTURE SENSOR KINECT 1 KINECT 2

  6. SKELETON TRACKING • Complicated problem • Uses techniques from artificial intelligence, machine learning, and computer vision • Requires massive amounts of training data

  7. SOFTWARE TOOLKITS • OpenFrameworks (C++) • Cinder (C++) • Kinect .NET SDK (C#) • Point Cloud Library (C++) • OpenNI (C++) • OpenCV (C++)

  8. NODE / JAVASCRIPT • Edge.js makes Kinect SDK available • THREE.js / Canvas 3D / CubicVR • Distinct lack of libraries (OpenCV, PCL)

  9. DISPLAYING POINT DATA • OpenFrameworks / OpenGL • Kinect provides world coordinates; store as vectors (ofVec3f) • Convert point cloud vectors to mesh (ofMesh) • Some effects “accidental” artifacts of mesh rendering

  10. FLOOR REMOVAL • Plane detection with RANSAC algorithm, courtesy PCL • Hooray math! Point/plane distance • Expensive filtering: optimization pays

  11. “EXPLODING” SHADOWS • Easy centroid calculation: • Subtract centroid from each point and normalize: unit vector away from centroid • Scale unit movement vector and add to point to move away from centroid

  12. KATE RAFTER ON TECHNOLOGY AND PERFORMANCE

  13. LEARNING MORE • Trigonometry (Kahn Academy) • Linear Algebra (Kahn Academy) • The C++ Programming Language, 4th Edition • Making Things See by Greg Borenstein • Books on OpenFrameworks and Cinder from Pact Publishing

  14. ONWARD…. • Projector/real-world correspondence • Identify real-world features (with depth and/or visual data)

  15. THANK YOU • ethan.brown@popart.com • @EthanRBrown • k.e.rafter@gmail.com • www.katerafter.com www.popart.com zepln.com/wdne

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