A face device is a system to acquire a set of digital data samples representing a human face. As the human face is a complex 3D object, the data can be in several forms: a 2D image where the gray levels of the pixels represent the projected reflectance of the face surface under visible illumination; a 2D image where the gray levels of the pixels represent the projected reflectance of the face surface illuminated with an active source; a 2D thermal image representing the heat emitted by the face surface; 3D samples of the surface structure.
Face devices can be distinguished on the basis of the data dimension if it is active or passive. Face devices can be passive, i.e., based on the passive reflectance of ambient light by the body, or active, i.e., associated with an energy emitter and a sensor to capture the energy reflected by the face. The data captured can be either in 2D or 3D form.
A face device can...
- 1.Litwiller, D.: CCD vs. CMOS: facts and fiction. Photonics Spectra, pp. 151–154 (2001)Google Scholar
- 4.Slama, C.: Manual of Photogrammetry/ American Society of Photogrammetry, Falls Church, VA, USA, 4th edn. (1980)Google Scholar
- 5.Phillips, J.J., Flynn, P., Scruggs, T., Bowyer, K.W., Chang, J., Hoffman, K., Marques, J., Jaesik, M., Worek, W.: Overview of the face recognition grand challenge. In Proceedings CVPR05, pp. 947–954 (2005)Google Scholar