22
Image digitization and reconstruction
A sequence of still pictures captured and displayed at a sufficiently high rate – typically between 24 and 60 pictures per second – can create the illusion of motion, as I will describe further on page 51. Sampling in time, in combination with 2-D (spatial) sampling, causes digital video to be sampled in three axes – horizontal, vertical, and temporal – as sketched in Figure 22.1.
One-dimensional sampling theory was described in Filtering and sampling, on page 191.
One-dimensional sampling theory applies along each of the three axes. I sketch just three temporal samples, because temporal sample count is limited by the number of picture stores provided; picture stores are more expensive than linestores. ...
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