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MODELLING > MOTION CAPTURE > Flashcards

MOTION CAPTURE Flashcards

KAK

1
Q

what is motion capture

A

process of recording movement of people / objects

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2
Q

need for motion capture (2)

A
  1. assessment of health status

2. rehabilitation process

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3
Q

motion capture conventional practices (4)

A
  1. low tech mainly observational
  2. subjective evaluations
  3. poor evaluation criterea
  4. bad long term monitoring
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4
Q

MOCAP applications (4)

A
  1. gait analysis
  2. rehabilitation & monitoring
  3. patient motion capabilities & habits
  4. ergonomic analysis
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5
Q

biomedical model shows (5)

A

skeleton, joints, positions

velocities, acceleration (linear/angular)

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6
Q

motion capture classified as (2)

A
  1. invasive & internal

2. noninvasive & external

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7
Q

example of invasive internal (2)

A
  1. x-ray

2. fluoroscopy imaging

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8
Q

4 types of motion capture

A
  1. mechanic
  2. magnetic
  3. optical
  4. inertial
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9
Q

2 types of optical

A
  1. markers

2. markerless

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10
Q

MECHANICAL
what measures movements
what is exoskeleton composed of (2)

what does deformation of exoskeleton do

A

deformable exoskeleton
segments connected by metal or pastic geniometers
potentiometers on joins
transformed into electrical signals

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11
Q

MAGNETIC
what detects
what is detected

A

magnetomeres / electromagenetic coils

orientation or movement in magentic field

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12
Q

OPTICAL
what type of camera
what do cameras do (2)

what is optical-markers
what is optical-markerless

A 
infrared
1. track light source or reflection
2. identify profiles from video frames
markers placed in remarkable points of the body
dedicated tool recognizes the body
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13
Q

2 types of markers

A
  1. passive

2. active

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14
Q

what are passive markers

A

retroreflective markers

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15
Q

what are active markers (2)

A

LEDs, markers

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16
Q

main factors of optical markers (4)

A
  1. number of cameras
  2. camera resolution & frame rate
  3. light condition
  4. contrast: marker vs. background
17
Q

problem w/ optical marker

A

occlusion by person/obstacles

18
Q

optical marker technology (3)

A
  1. VICON (passive)
  2. QUALYSIS (both)
  3. OPTITRACK (both)
19
Q

OPTICAL-MARKERLESS

3 benefits optical markerless

A
  1. low cost
  2. simple
  3. portable
20
Q

optical markerless mechanism

A

human body silhouette identified, then identify body parts

21
Q

optical markerless equipment (2)

A

RGB camera / RGB depth camera

22
Q

INERTIAL

what detects

A
  1. accelometers

2. gyroscopes

23
Q

inertial units

A

inertial measurement units

24
Q

inertial advantages (2)

A
  1. portable

2. capture tight spaces

25
Q

inertial cons (2)

A
  1. low position accuracy

2. position drift

26
Q
  1. OPTICAL MARKER (both active & passive)

pros (2)

A
  1. high precision

2. free marker positioning

27
Q
  1. OPTICAL MARKER (both active & passive).

Cons (3)

A
  1. high cost
  2. long setup time
  3. need dedicated lab
28
Q

OPTICAL MARKERLESS - RGB

pros (2)

A
  1. low cost

2. easy calibration

29
Q

OPTICAL MARKERLESS - RGB

cons (3)

A
  1. low precision
  2. need up to 6 cameras
  3. influence of environment
30
Q

OPTICAL MARKERLESS-RGB-D

pros (3)

A
  1. low cost
  2. good precision
  3. easy calibration
31
Q

OPTICAL MARKERLESS-RGB-D

Cons (1)

A
  1. interference among sensors
32
Q

INERTIAL-3D ACCEL

pros (2)

A
  1. low cost

2. sensibility

33
Q

INERTIAL-3D ACCEL

cons 2

A
  1. loose positioning

2. long setup time

34
Q

SOFTWARE tasks for motion capture processing

A
  1. joints identification
  2. skeleton generation & motion
  3. motion data
  4. medical indexes
35
Q

motion capture flowchart steps:

A
  1. camera calibration
  2. capture tight spaces
  3. 2D marker identification
  4. subject calibration
  5. 3D marker reconstruction
  6. cleanup
  7. skeletal motion
36
Q

example of independent mocap software

A

iPi motion capture (sony playstation)

MODELLING (4 decks)

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