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CHAPTER 12 /COMPUTERVISION 177
FIGURE 12.24 Optical flow (a) straight-line motion and (b) rotation.
FIGURE 12.25 Optical flow of a 2D image.
Facial expression detection can be done by using Discrete Cosine Transform
(DCT) conversion* DCT conversion is performed to a rectangular area that includes
an eye. When the eye closes, distance along the vertical axis increases. When the
mouth opens, distance along the horizontal axis increases. A schematic of facial
expression detection is shown in Figure 12.26.
12.5 APPLICATION OF TELESENSATION
12.5.1 Recognition and Synthesis of a 3D Human Image
To provide a virtual space teleconferencing environment or a virtual space distance
education environment with realistic sensations, research on how a viewer can get
different perspectives on an object or on a human is being carried out. The posi-
tion of the eye and the direction of view are usually detected by having the par-
ticipant wear special glasses with sensors. The sensors detect the eye position. The
shape of the object is adjusted and the color mapped and displayed on screen to
