ml87v21071 Oki Semiconductor, ml87v21071 Datasheet - Page 34

• Manufacturer Part Number: ml87v21071
• Description: Video Signal Noise Reduction Ic With A Built-in Frame Memory
• Manufacturer: Oki Semiconductor

2.1.3 Detection of Motion between Frames, Fields, and Lines
OKI Semiconductor
There are two types of luminance signal motion detection: level motion detection and continuous code motion
detection.
Chrominance signal motion detection includes level motion detection.
From the differential data between fields, including luminance signal motion and noise, the high frequency
component (∆HY) is filtered with the LPF, extracting only the low frequency differential data (∆LY).
Luminance LPF: F(z) = (1/8)z
The low frequency differential data is assumed to have a large proportion of the motion component, so the
absolute value of that data (|∆LY|) is compared with the luminance noise convergence level set in YNS[5:0] to
determine the amount of motion.
If the result shows that the differential absolute value is greater than the noise convergence level, it is determined
that there is a lot of motion in the data, and the motion flag (YMT) = 1 is set.
If the differential absolute value is less than the noise convergence level, it is determined that there is not much
motion in the data, and the motion flag (YMT) = 0 is set.
This feature detects sequences of 3, 4, and 5 continuous codes in the differential data that includes the pixels for
which noise detection is being performed. Where continuity is detected, the absolute value of the low frequency
differential data and the continuous code motion detection level YMS[3:0]( SUB:50h-bit[3:0]) are compared to
determine the amount of motion.
• 3 Continuous Code Detection
If 3 continuous codes are detected to be the same and their low frequency differential data absolute values are
equal to or greater than the continuous code motion detection level (YMS[3:0]), the data is judged to have much
motion, and the 3 continuous code motion flag (YMT3) = 1 is set.
If the absolute value is less than the continuous motion detection level, the data is judged to have little motion, and
the 3 continuous code motion flag (YMT3) = 0 is set.
Luminance Level Motion Detection
Luminance Continuous Code Motion Detection
Table F2-1-3 (2) Luminance 3 Continuous Code Motion Detection
Table F2-1-3 (1) Luminance Level Motion Detection
Motion Detection Conditions
Motion detection condition
-2
+ (1/8)z
| ∆ LY| ≥ YMS[3:0]
| ∆ LY| < YMS[3:0]
| ∆ LY| > YNS[5:0]
| ∆ LY| ≤ YNS[5:0]
| ∆ LY| > 64
| ∆ LY| > 16
-1
+ (1/2)z
0
+ (1/8)z
1
Motion flag (YMT3)
+ (1/8)z
Motion Flag (YMT)
2
1
1
0
1
1
0
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