SDA9410
Preliminary Data Sheet
Motion compensation
curve). With motion compensation (Figure 48: rhomb curve) intermediate motion
phases are calculated and the ideal curve is obtained, no motion blurring occurs.
1: camera mode
motion position (1D)
Original 50/60Hz interlaced
Simple non motion
compensated
SRC 100/120Hz interl.
Motion compensated
SRC 100/120Hz interl.
Motion compensated
SRC 50/60Hz progr.
50/60Hz step
time
100/120Hz step
Figure 48
Output sequence generation: Camera mode
A 50 Hz film mode input sequence already shows a motion blur (Figure 49: square
curve). This artifact increases on higher velocities. Motion compensation techniques can
reduce this effect under a visible threshold. Now the deviation from the ideal curve is
minimized (Figure 49; rhomb curve). The result is an output motion potrayal, which is
visibly smoother compared with the original input sequence.
A 60 Hz input field sequence has motion artifacts on higher velocities (Figure 50: square
curve) like the 50 Hz film mode but the blur is much more irregular caused by the 2-3
pulldown. The preferred application in this case is a 60 Hz progressive conversion. Here
also the motion portrayal can be improved by creating a new motion phases (Figure 50:
circle curve). Also this conversion results in an clearly improved motion potrayal.
Evaluation shows a very large improvement of the Film motion portrayal.
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Micronas
MICRONAS [ MICRONAS ]
