The second stage corresponds to face interpretation . This is determined by the application. The third stage is to synthesize the various emotional states using computer graphics models. Applications include video teleconferencing and systems which combine auditory and visual information. Once segmented, we want to track specific objects which are pre-determined by the application being implemented.
Segmentation is among the most difficult problems in visual information processing.
Motion segmentation is especially important for video applications. Automatic object tracking, is fundamental in applications such as monitoring and surveillance. Given a video sequence, determine in which frames scene changes occur. Temporal segmentation is a major task in video production and content-based handling. Target applications include assisted non-linear video editing systems, and video library indexing.