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I 76 INTELLIGENT COMMUNICATION SYSTEMS
FIGURE 12.22 Tracing method.
FIGURE 12.23 Optical flow.
Detection of optical flow: Detecting the movement of feature points of two im-
ages at different times, allows optical flow to be determined (Figure 12.25).
12.4.7.2 Motion Capture
To recognize human motion, body movement, hand movement, or a facial expres-
sion is motion capture. Conventionally, markers are put on the face or sensors are
put on the body and to register motion. Research on detecting facial expression
without the need to wear sensors or markers is also being carried out.
