Temporal Domain

When a face is captured over a period of time, as in video recording, it is often said that a facial image is available in temporal domain or that it has temporal resolution. In contrast, when only a single image of a face is available, as in a passport photograph, it is said that facial image is not available in temporal domain. In sensing data, a natural tradeoff is observed: either sensory data are of high spatial resolution or temporal resolution, but not of both at the same time. For example, an image of a face in a printable document is of high resolution, whereas faces observed live on TV are normally of very small resolution. As demonstrated by biological vision systems, recognizing an object that is observed in temporal domain (e.g., recognizing a face on TV) can be done just as efficiently or even more efficiently than recognizing the same object from a single high-resolution sample. For automated recognition systems however this is not the case yet.

Face Databases and...