kin 221 module b4 - kinematic and motion tracking

resolution

optoelectronic passive system needs to calibrate to give ____________ to the cameras

true

calibrating the optic passive system helps the cameras map out and match the coordinates

t or f

kinematics

branch of physics concerned with motion of a body/segment or system of bodies w/o consideration of forces involved

video based motion capture \`

uses tracking points placed on joints and uses a video analysis as a means to measure joint angles

true

the perspective of the video camera is important when using video based motion capture for joint angle measuring

\
t or f

false

video based motion capture involves a lots of time

\
t or f

optoelectronic/optical motion capture system

this capture system was created in 1899 by Fischer and Braune using gessler tube reflected by light and uses an electronic current

optoelectronic active system

markers used will emit infrared light which is captured by camera and coordinates are recorded

true

clusters of markers are used for optical active systems

\
t or f

false

optical active systems involve the cluster of markers flashing all at once

\
t or f

optical passive system

this system uses individual markers which are reflected by infrared lights and captured by a camera

true

optical passive system uses markers that are not connected by wires

\
t or f

true

optical passive system requires an area with all forms of light to be kept out and things that can reflect infrared light

\
t or f

false

optical passive system does not need to be calibrated before use

\
t or f

electromagnetic systems

uses emitters/sensors to make an electromagnetic field where the sensors on the body make a distortion picked up by an emitter

true

electromagnetic systems only require one sensor per segment

\
t or f

false

in electromagnetic systems, seeing the markers/sensor is a requirement

\
t or f

true

electromagnetic systems can be susceptible to other metals

\
t or f

electrogoniometer/potentiometer

a transducer which senses the relative motion in a joint and turns it to an electrical output

false

potentiometer has it’s own global coordinate system, so you know where you are relative to space

\
t or f

true

filtering data before calculating the position is a requirement

\
t or f

coordinate system

to calculate position and orientation of a segment a ____________ is required

differentiate

to get the velocity and acceleration you ___________

marker/technical coordinate system

optical active system markers uses a _________________ for coordinates

transformation

the technical coordinate system requires the markers to be oriented relative to the anatomical position which is done through a process called ___________

random effect

most noise from unfiltered data come from ____________

filters

removes noise from signal with the Fourier analysis

true

a low pass filter is often used

\
t or f

pass through

frequencies below chosen cut-off frequency ____________ the low pass filter

filter out

frequencies above the chosen cut-off frequency will ___________ due to the low pass filter

raw data points

the filtered results at a given point depends on ___________ (x)

filtered data points before it

the filtered results at a given point depends on ___________ (y)

refilter backwards

to fix the time lag filtering causes in a signal, we ____________

dual pass filter

this filter will filter the signal twice, once to get rid of the noise and second to get rid of time lag

3

to locate a segment 3D how many markers do we need minimum

false

3 markers on an object will always work to locate a segment in 3D

\
t or f

colinear

3 markers on a segment cannot be ___________ in order to read a segment