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Todd R. Reed<br />

University of California at Davis<br />

28.1 Introduction<br />

© 2002 by CRC Press LLC<br />

28<br />

Digital Video Processing<br />

28.1 Introduction<br />

Some Historical Perspective • Video • Image Sequences<br />

as Spatiotemporal Data<br />

28.2 Some Fundamentals<br />

A 3-D System • The 3-D Fourier Transform • Moving<br />

Images in the Frequency Domain • 3-D Sampling<br />

28.3 The Perception of Visual Motion<br />

Anatomy and Physiology of Motion Perception • The<br />

Psychophysics of Motion Perception • The Effects<br />

of Eye Motion<br />

28.4 Image Sequence Representation<br />

What Does “Representation” Mean? • Spatial/<br />

Spatial-Frequency Representations • The Gabor<br />

Representation • Spatial/Scale Representations<br />

(Wavelets) • Resolution<br />

28.5 The Computation of Motion<br />

The Motion Field • Optical Flow • The Calculation<br />

of Optical Flow<br />

28.6 Image Sequence Compression<br />

Motion Compensated Prediction/Transform<br />

Coders • Perceptually Based Methods<br />

28.7 Conclusions<br />

Rapid increases in performance and decreases in cost of computing platforms and digital image acquisition<br />

and display subsystems have made digital images ubiquitous. Continued improvements promise<br />

to make digital video as widely used, opening a broad range of new application areas. In this chapter,<br />

some of the key aspects of this evolving data type are examined.<br />

Some Historical Perspective<br />

The use of image sequences substantially predates modern video displays (see, e.g., [1]). As might be<br />

expected, the primary initial motivation for using these sequences was the depiction of motion. One of<br />

the earlier approaches to motion picture display was invented by the mathematician William George<br />

Horner in 1834. Originally called the Daedaleum (after Daedalus, who was supposed to have made figures<br />

of men that seemed to move), it was later called the Zoetrope (life turning) or the Wheel of Life. The<br />

Daedaleum works by presenting a series of images, one at a time, through slits in a circular drum, as the<br />

drum is rotated.<br />

Although this device is very simple, it illustrates some important concepts. First and foremost, the<br />

impression of motion conveyed by a sequence of images is illusory. It is the result in part of a property

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