
2-3 pulldown 36
Motion picture film originates at 24 frames per second.
Many television programs, including the majority of
prime-time programs, originate on film at this rate. This
chapter
discusses
the conversion of film to video at
frame rates different from the native 24 Hz of film.
Film has historically been transferred to 480i29.97
video using a technique called 2-3
pulldown,
whereby
successive film frames are scanned first twice then three
times to produce five video fields. The process is then
repeated, reversing the roles of the first and second
fields. The scheme is sketched ...