Facial motion capture is related to body motion capture, but is more challenging due to the subtle expressions possible from small movements of the eyes and lips, requiring even greater resolution and fidelity. Motion capture, or mocap, is a technique of digitally recording the movements of real things — usually humans — it originally developed as an analysis tool in biomechanics research, but has grown increasingly important as a source of motion data for computer animation. ...
Two predominate technologies exist; marker and markerless tracking systems. PhaseSpace Optical Motion Capture is developing a hybrid solution.
Marker based systems apply 10 to 100 markers to the actors face and track the marker movement with high resolution cameras. This has been used on movies such as Polar Express to allow an actor such as Tom Hanks to drive the facial expressions of several different characters. Unfortunately this is relatively cumbersome and makes the actors expressions overly driven once the smoothing and filtering have taken place. (Disclosure: PhaseSpace markers are even more cumbersome by adding wires to bulky markers.) This article may be too technical for most readers to understand. ... A camera is a device used to take images (usually photographs), either singly or in sequence, with or without sound, such as with video cameras. ...
Markerless technolgoies use the features of the face such as nostrils, the corners of the lips and eyes, and wrinkles and then track them. This technology is demonstrated at http://www.ri.cmu.edu/projects/project_448.html and other locations, using active appearance models, Principle component analysis, eigen tracking and other techniques to track the desired facial features from frame to frame. This technology will likely be the winner in a few years, as it is much less cumbersome, and allows greater expression for the actor. A frame or framework is a structural skeleton, which supports the other components of the object. ...
It also has the ability to track eyelids and tongues which are obvious problems in most computer animated features.
In the motioncapture session itself, an actor, often a martial artist, dancer, or mime, wears a leotard with a number of markers taped velcroed or glued to specific points all over their body.
Motioncapture technology is frequently used in digital puppetry systems to aid in the performance of computer generated characters in real-time.
Facialmotioncapture is also sometimes utilized to digitally capture the complex movements in a human face, especially while speaking.
Motioncapture systems which involves the process of recording a live motion event and translating it into usable mathematical forms are now being widely used in many applications such as medicine (1-5), sports (6, 7), entertainment industry, and in the study of human factors (8).
MotionCapture is the process of recording a live motion event and translating it into usable mathematical terms by tracking a number of key points in space over time and combining them to obtain a single 3D representation of the performance [10].
MotionCapture is the process of recording a live motion event and translating it into usable mathematical terms by tracking a number of key points in space over time and combining them to obtain a single 3D representation of the performance [1, 47, 48].
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