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The countermeasures based on differences in motion patterns rely on the fact that real faces display a different motion behaviour compared to a spoof attempt.
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Instead of using an IP or Mac address, the technology relies on motion patterns for the address code.
Benabbas et al., "Motion pattern extraction and event detection for automatic visual surveillance") relies on extraction of associated motion patterns from optical flow fields by means of probabilistic clustering for automatic detection of events related to crowds and groups of people.
For methods relying on trajectory prototypes, inter-vehicle influences cannot be taken into account during the learning phase because the resulting number of motion patterns would quickly become intractable.
Original frameDetected motion patterns.
Differences in motion patterns.
We applied sinusoidal motion patterns with different gait pattern parameters.
Then, we compare the motion patterns of possible detections with the modeling motion patterns.
Measurements from these were then subjected to a mathematical model to quantify their surface motion patterns.
Figure 12 Detected motion patterns in a pilgrimage sequence.
Figure 11 Major motion patterns in an urban scene.
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