
Raster images in
computing
4
This chapter places video into the context of
computing. Images in computing are represented in
three forms, depicted schematically in the three
rows
of
Figure 4.1 overleaf:
symbolic image description, raster
image,
and
compressed image.
9 A
symbolic image description does
not directly
contain an image, but contains a high-level 2-D or 3-D
geometric description of an image, such as its objects
and their properties. A two-dimensional image in this
form is sometimes called a
vector graphic,
though its
primitive objects are usually much more complex than
the straight-line segments