Lecture 4

Question 1

How many cameras are needed to create a motion capture environment in a lab?

Answer 1

At least 8

Question 2

What type of cameras are used for motion capture analysis?

Answer 2

Infrared cameras

Question 3

What are the advantages of wearable sensors? (6 answers)

Answer 3

• Directly on the body
• Cost-effective
• Simple operation
• In controlled and/or real-life settings
• Remote support/feedback
• Extensive parameters

Question 4

WHat requirements do sensors have to fulfil?

Answer 4

Precision
Validity/accuracy
Objectivity
Reliability/reproducibility
Sensitivity to changes

Question 5

What does an inertial measurement unit (IMU) consist of?

Answer 5

Accelerometers, gyroscopes, and magnetometers

Question 6

What are some opportunities/limitations of IMUs? (3 & 4)

Answer 6

Opportunities:
- Lab-independent
- Long-term monitoring is possible
- Direct quality check is possible

Limitations
- Drift and ferromagnetic influence
- Measurement of accelerations and angular velocities, no position
- Load is only measured indirectly
- Distances determined by integration (gives in complete data with +C)

Question 7

What is the issue with using filters for your data?

Answer 7

The data has the potential to change significantly so it can be difficult to determine an optimal filter.

They still have their uses but it is important to report which filter gets used