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CS 6353 Computer Graphics and Multimedia Motion Capture Motion CaptureBy Vanitha Kowdeed.

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Presentation on theme: "CS 6353 Computer Graphics and Multimedia Motion Capture Motion CaptureBy Vanitha Kowdeed."— Presentation transcript:

1 CS 6353 Computer Graphics and Multimedia Motion Capture Motion CaptureBy Vanitha Kowdeed

2 Overview: Definition of Motion Capture Definition of Motion Capture History of Mocap History of Mocap Rotoscoping Rotoscoping Types of Motion Capture Types of Motion Capture Prosthetic Prosthetic Optical Optical Electromagnetic Electromagnetic Acoustic Acoustic Marker Placement Marker Placement Production Pipeline Production Pipeline Objects for Mocap Objects for Mocap Skin Deformation Skin Deformation Examples Examples References References

3 What is Motion Capture? Motion Capture of an object involves sensing, digitizing, and recording that object in motion – Whole body – Hands – Face One way of acting out an animation Or A process by which a movement can be recorded digitally.

4 Originally used for military tracking purposes. Originally used for military tracking purposes. In sports, motion capture acts as a tool for biomechanic research that is focused on the mechanical functioning of the body, like how the heart and muscles work and move. In sports, motion capture acts as a tool for biomechanic research that is focused on the mechanical functioning of the body, like how the heart and muscles work and move. History of Motion Capture The Motion Capture began in late 1800s when Etienne Jules Marey and Eadweard Muybridge performed motion studies on various animals and humans.

5 Etinne Jules Mareys Motion Capture Suit History of Motion Capture (Contd.) Eadweard Myubridge Historically, Motion Capture in animated movies was created using the extension of "ROTOSCOPING" technique.

6 Rotoscoping is an animation technique in which the animators trace over live- action film movement frame by frame, for use in animated films. The pre-recorded live- action film images are projected onto a frosted glass panel and are re-drawn by an animator. This project equipment is called rotoscope. Rotoscoping is an animation technique in which the animators trace over live- action film movement frame by frame, for use in animated films. The pre-recorded live- action film images are projected onto a frosted glass panel and are re-drawn by an animator. This project equipment is called rotoscope. Tom Goes To The Mayor

7 There are primarily five methods in motion capture. They are : There are primarily five methods in motion capture. They are : Prosthetic (or Electromechanical) Prosthetic (or Electromechanical) Acoustic Acoustic Electromagnetic Electromagnetic Optical fiber Optical fiber Optical Optical

8 Prosthetic Motion Capture uses Potentiometers on the aforementioned plastic exoskeleton that an actor must wear, and then act out his or her movements. This is very accurate and transmits real-time data at a far greater range than any other technology. Prosthetic Motion Capture uses Potentiometers on the aforementioned plastic exoskeleton that an actor must wear, and then act out his or her movements. This is very accurate and transmits real-time data at a far greater range than any other technology. A gypsy3 prosthetic suite

9 Fiber Optic sensors Fiber Optic sensors Rotation based on transmitted light Rotation based on transmitted light

10 This approach has a central magnet with several receivers attached to the actors body. The receivers capture and record the actors movements and save them to the computer. This motion capture method can be hindered by nearby metal objects if they are large enough and depending on the power of magnets being used. This approach has a central magnet with several receivers attached to the actors body. The receivers capture and record the actors movements and save them to the computer. This motion capture method can be hindered by nearby metal objects if they are large enough and depending on the power of magnets being used. A suit with magnetic sensors

11 Acoustic Motion Capture uses audio transmitters on the actors body that make a clicking sound when activated by movement. Receivers measure the time it takes for the sound to reach them and triangulate the data to indicate a point on a 3D plane. This method has a problem of audio interface that effects the accuracy of the motion capture. And the other disadvantages are as follows: Limited Rage Limited Rage Limited number of sensors Limited number of sensors Cables on body Cables on body

12 Reflective Markers Multiple Cameras that digitize different views of performance.

13 Motion Capture Systems Inside-In Inside-Out Outside-In Electromagnetic Acoustic Optical Electromechanical Optical Fiber

14 Location should move rigidly with joints Location should move rigidly with joints Stay away from bulging muscles Stay away from bulging muscles

15 Production Pipeline Sensor Calibration Subject Calibration Record Movements Compute the position and orientation of camera/transmitter Place markers on body, compute skeleton structure(lengths of links) Marker positions (and orientations) varying over time Marker Data Cleanup Convert to Joint Angles Occlusion and correspondence problems Mapping to characters Direct Mapping or retargetting

16 Details to be taken Care of at time of Motion Capture: What we need is – Position and orientation of the root segment – Joint angles – Length of each link (is it possible ?) – Skeleton connectivity – Skin deformation The mocap system actually provides – Marker positions on the skin, or – The positions and orientations of markers

17 Types of Objects that can be had motion capturing Human whole body Portions of body Facial animation Animals Puppets Other objects

18 What is Captured ? Skin Deformation:

19

20 References: Motion Capture- http://en.wikipedia.org/wiki/Motion_capturehttp://en.wikipedia.org/wiki/Motion_capture A Brief History of Motion Capture for Computer Character Animation- http://www.siggraph.org/education/materials/HyperGraph/animation/character_ animation/motion_capture/history1.htm http://www.siggraph.org/education/materials/HyperGraph/animation/character_ animation/motion_capture/history1.htm Computer Graphics World- http://www.cgw.com/ME2/dirmod.asp?sid=&nm=&type=Publishing&mod=Publi cations%3A%3AArticle&mid=8F3A7027421841978F18BE895F87F791&tier=4 &id=A8B4004315A84A5089255A2E366E2E78 Motion Capture- What is it? - http://www.metamotion.com/motion- capture/motion-capture.htmhttp://www.metamotion.com/motion- capture/motion-capture.htm ACCAD-Motion Capture Lab-Home, information and documentation- http://accad.osu.edu/research/mocap/mocap_home.htm

21 References (contd..) Motion Capture- http://www.postmagazine.com/ME2/dirmod.asp?sid=&nm=&type=Publishing& mod=Publications::Article&mid=8F3A7027421841978F18BE895F87F791&tier =4&id=C715B81DD6674D62BD666D304D2E8D0B Motion Capture- http://instruct1.cit.cornell.edu/courses/ee476/FinalProjects/s2005/Motion_Cap ture_KHY6_DCL34/Motion_Capture.htm Practical Motion Capture in Everyday Surroundings- http://www.youtube.com/watch?v=V0yT8mwg9nc Motion Capture- http://web.mit.edu/comm-forum/papers/furniss.htmlhttp://web.mit.edu/comm-forum/papers/furniss.html Motion Analysis Studios- http://www.mastudios.com/index.htmlhttp://www.mastudios.com/index.html

22 Any Questions ????????

23 Thanks !!!!


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