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Kinematic Flashcards

(8 cards)

1
Q

Why do impact sports require a higher sampling frequency?

A

Because they occur at a higher frequency so a higher frequency is needed to capture a true representation.

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2
Q

Why do you need to use a high shutter speed?

A

Creates a clear image so joint marker locations can be pinpointed accurately

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3
Q

What is genlocking?

A

Synchronisation of shutter speed across cameras - needed to 3D analysis

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4
Q

What are the pros and cons of 2D analysis

A

Cheaper
Easier to use

Can only analyse one plane of motion at a time
Less accurate as always tends to be movement outside of one plane that can be important to whole movement

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5
Q

What are the pros and cons and 3D motion analysis?

A

Truer representation of whole movement

More complicated and more expensive

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6
Q

What are the main sources of error in movement analysis?

A

Human error - incorrect/inconsistent marker placement
Perspective error - objects distance from lens impacts its apparent size
Parallax error - false angles displayed unless perfectly perpendicular to lens

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7
Q

What are some considerations when setting up a kinematic analysis?

A

Stable tripod
Camera positioned far away utilising zoom
High shutter speed
High frame rate (adequate to frequency of data)
Movement occurs perpendicular to camera
Tight clothes/reduce marker movement

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8
Q

How would you ensure a reliable digitisation?

A

Repeat analysis of at least one recording several times and compare results - should be similar

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