SDA9410
Preliminary Data Sheet
Global motion, film mode and phase detection
vectors from the estimator or the analysis of the field difference. It is expected that with
film material broadcast in the 50 Hz television standard, motion will occur only every
second field. Therefore the “vector activity” (VAC) in the SDA 9410 as sum of the
absolute vector components which are larger as a threshold defined by the I²C
parameter MEMMINMOT (I²C Bus sub address 4Bh) is accumulated . Depending on the
sum, the actual detected mode (MOVMO, MOVTYP) and several I²C Bus parameters
(MEMINTH, MEMAXTH, SFMINTH, SFMAXTH) the actual field is decided to have
motion or not. The table below explains the decision of the detection:
Actual field has
If
motion
[VAC > scmax * (MEMAXTH+1)] or
[ (VAC > scmin * (MEMINTH+1)) and (VAC <= scmax *
(MEMAXTH+1)) and
MOVMO=0]
no motion
[VAC <= scmin * (MEMINTH+1)] or
[ (VAC > scmin * (MEMINTH+1)) and (VAC <= scmax *
(MEMAXTH+1)) and
MOVMO=1]
Table 81
Principles of global motion and film mode detection
The values scmin and scmax are scale factors which are defined by the table below:
SFMINTH/SFMAXTH
scmin/scmax
00
01
10
11
8
16
32
64
Table 82
Definition of scmin/scmax depending on SFMINTH/SFMAXTH
To avoid switching artifacts a temporal hysteresis is implemented. Temporal hysteresis
means, that at least a certain number of fields defined by the I²C Bus parameter
MEMOHIST must fulfill the conditions for switching from camera mode to film mode or
vice versa. The number of fields (NoFields) defined by the I²C Bus parameter
MEMOHIST can be calculated by the equation below:
NoFields = 2 ꢁMEMOHIST + 1ꢂ
105
Micronas
MICRONAS [ MICRONAS ]
