Advanced 2:3:3:2 pulldown, Ab c d – Matrox MXO2 PCIe Host Adapter User Manual
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Advanced 2:3:3:2 pulldown
Advanced 2:3:3:2 pulldown
Advanced 2:3:3:2 pulldown was developed as an alternative to the standard
pulldown method for making frame rate conversions in DV video. It is used to
convert 486p @ 23.98 fps video to NTSC (486i @ 29.97 fps) video. This
conversion is used when video footage is acquired by a DV camera at 23.98 fps
and recorded to DV tape with the recorder set for advanced pulldown (called
24PA or 24P Advanced mode on some devices). Advanced 2:3:3:2 pulldown
differs from standard 2:3 pulldown in that the two middle frames of the video
sequence are each converted to three video fields.
The following diagram demonstrates the process:
Advanced 2:3:3:2 pulldown is accomplished by representing the first frame of
progressive video (frame
A
) as two fields of video (fields
a1
and
a2
), the second
frame (frame
B
) as three fields of video (fields
b1
,
b2
, and
b3
), the third frame
(frame
C
) as three fields (fields
c1
,
c2
,
and
c3
), and the fourth frame (frame
D
) as
two fields (fields
d1
and
d2
).
A
B
C
D
a1
a2
b1
b2
b3
d1
c3
c2
c1
d2
P
rogressive frames @ 23.98 fps
Video fields @ 29.97 fps
Frame
A
Frame
C
Frame D
Frame B
Frame E