Digital Signal Processing Reference
In-Depth Information
For example, if a 3:2 cadence is detected the deinterlacer can
suspend its motion adaptive mode, throw away the repeating
field, and weave the fields to get perfect deinterlacing with
minimal effort.
Deinterlacers must have logic built-in to detect the cadence
e
this can get even more complex when one part of the frame might
have 3:2 cadence, while the other part may be straight interlaced
(e.g. a film is inserted in an interlaced video). To detect and
correctly deinterlace such a source would require deinterlacers to
implement per-pixel cadence detection.
6.5 Conclusion
Deinterlacing is an important and common technique used in
a range of video processing systems. This is probably not going to
change in the near future, because we have to deal with legacy
video formats and also legacy monitors.
As with all video processing techniques, deinterlacing can be
as complex or as simple as the available computational resources.
The simplest techniques are easiest to implement but also
produce mediocre quality results. Motion-adaptive deinterlacing,
while complex and hardware intensive, provides high quality
results.
