Image Processing Reference
In-Depth Information
1 pixel line
2 pixel line
Defocussed line
Figure 5-5
Horizontal detail.
Position in first field
Position in second field shown in dashed outline
Even field
Odd field
Figure 5-6
Interlaced object movement.
Pausing the video so that both fields are displayed presents a very disturbed image with
some detail twittering about all over the place while the background remains still.
Some of these effects are alleviated by only displaying one field when the video is
paused, but this sacrifices vertical resolution. Averaging between the two fields is another
possibility that works some of the time, but it is a compromise as well. Chapter 33 revisits
that topic in the discussion about de-interlacing. This is an important part of the practical
encoding process.
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