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TadasBaltrusaitis / OpenFace

OpenFace – a state-of-the art tool intended for facial landmark detection, head pose estimation, facial action unit recognition, and eye-gaze estimation.
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Some questions about landmarks locations in 3D #985

Open tkzky opened 3 years ago

tkzky commented 3 years ago

Hello! I want to know whether the z coordinate value represents the depth information of the distance between the landmark and the camera?

TadasBaltrusaitis commented 3 years ago

It represents the distance from camera plane rather than camera itself. Sometimes this is called z-depth. Distance from camera would be referred to as radial depth.

Please note that this distance is only approximate (as depth estimation from a monocular camera is ill-posed) and will depend on camera calibration and assumptions about head size.