
Image digitization
and reconstruction
18
Figure 18.1
Horizontal domain
Y
Figure 18.2 Vertical
domain
Figure 18.3
Temporal domain
Figure 18.4
Spatial domain
In Chapter 16,
Filtering and sampling,
on page 141,
I described how to analyze a signal that is a function of
the single dimension of time, such as an audio signal.
Sampling theory also applies to a signal that is
a function of one dimension of space, such as a single
scan line (image row) of a video signal. This is the hori-
zontal or
transverse
domain, sketched in Figure 18.1 in
the margin. If an image is scanned line by line, the