User guide

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Appendix B: Choosing the Correct Deinterlacer B–3
Cadence Detection and Reverse Pulldown in the Deinterlacer II MegaCore Function—In Depth
January 2013 Altera Corporation Video and Image Processing Suite
User Guide
To enable this option, open the Deinterlacer II MegaWizard Plug-In Manager. In the
Parameter Settings tab, under the Behavior parameter, select Motion Adaptive High
Quality from the Deinterlacing method drop-down option.
With the moving “Dial” test sequence, the motion adaptive HQ mode of the
Deinterlacer II MegaCore function improves the Bob interpolation further by
operating on a 17x3 kernel of pixels. This allows much lower angles to be detected
and interpolated, eliminating the staircasing effect almost completely. The area is
8,252 LUTs.
Cadence Detection and Reverse Pulldown in the Deinterlacer II
MegaCore Function—In Depth
The deinterlacer is compile-time configurable to implement a 3:2 or 2:2 cadence detect
mode.
1 Cadence detection and reverse pulldown only applies to the Deinterlacer II MegaCore
function.
When images from film are transferred to NTSC or PAL for broadcast (which requires
frame-rate conversion), a cadence is introduced into the interlaced video. Consider
four frames from a film where each frame is shown split into odd and even fields, as
shown in Figure B–4:
Figure B–3. Deinterlacer II Motion Adaptive High Quality
Figure B–4. Odd and Even Fields
1
1
2
2
3
3
4
4
Original film
Odd lines
Even lines