Visage Technologies Documentation

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FaceTrack is available on all major platforms and embedded systems, including Windows, OS X, RedHat, Ubuntu, Android, iOS, HTML5, Xilinx and Raspberry Pi. Other platforms are available per request.

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Main features

  • Real-time tracking of multiple faces and facial features in input video or images

  • Returns 2D and 3D head pose, the coordinates of facial feature points (e.g. chin tip, nose tip, lip corners, mouth contour, chin pose, eyebrow contours), fitted 3D face model, eye closure and eye rotation (gaze direction)

  • Instant initialization: tracking starts immediately when the face is visible

  • Robust recovery from any losses due to occlusions, face turning away, tracked person coming and going etc.

  • Lightweight technology enabling high performance across a whole range of supported platforms

  • A detailed Technical Specification brochure is available, including measurements of accuracy, performance, code size, data size and memory usage – contact us to request it

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FaceTrack inputs

  • Tracks from any standard camera type (including webcams and mobile phone cameras) or any video file format thanks to the raw image interface

  • Tracks in color or grayscale image, including near-infrared

  • Configurable face search range (minimal and maximal face size to be detected and tracked)

  • Sustainable tracking on faces as small as 30×30 pixels

  • Wide head-pose range: achievable tracking on rotations up to 90 degrees of yaw, 90 degrees of roll and 30 degrees of pitch

  • Extensive tracking distances: for example, for a webcam with resolution 1920×1080 (Logitech C920), tracker can be configured to detect and track faces up to ~7.25 meters from the camera (with performance tradeoff)

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FaceTrack outputs

The tracker offers easy-to-use API for accessing the tracking data on-the-fly during tracking operation. The available data includes, for each face:

  • 3D head pose (translation and rotation)

  • Facial feature coordinates in global 3D space, relative to the head or in 2D image space. The feature points are specified according to the MPEG-4 FBA standard

  • 3D gaze direction (gaze vector)

  • Screen-space gaze coordinates: the point where the user is looking on the screen; requires a short calibration for each user.

  • Eye closure

  • A set of Action Units (e.g. jaw drop, lips stretch, brow raise…) describing the current facial expression; please note that these Action Units are similar but not exactly the same as FACS AUs

  • 3D model of the face in current pose and expression, returned as single textured 3D triangle mesh; enabling, for example face masking/filtering

Fully configurable tracker

Face tracking is fully configurable through an extensive set of parameters in easily manageable configuration files. The configuration file fully defines the tracker operation, in effect customizing the tracker for a particular application. Default configuration files include:

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