Week 23 - Linear Kinematics Flashcards
(34 cards)
what is a video ?
a 2D representation of a 3D scene
what are the most important parameters for video analysis ?
- sampling rate
- shutter speed
- aperture
what is sampling rate ?
frames per second
what is the standard frame rate ?
25 Hz
what is shutter speed ?
how long the sensor is ‘open’ and exposed to light
what are the risks of a low shutter speed ?
blurred image if the movement is fast
what are the risks of a high shutter speed ?
dark images
what is aperture ?
influences amount of light and depth of field
what is a large aperture ?
- much light
- smaller f-stop
what is a small aperture ?
- less light
- larger f-stop
- better depth of field
what is the sampling rate for walking ?
25 - 50 Hz
what is the sampling rate for running ?
50 - 100 Hz
what is the sampling rate for a football kick ?
100 - 200 Hz
what is the sampling rate for tennis serve ?
200 - 500 Hz
what is perspective error ?
the error caused in the position of an object when the viewing angle is not perpendicular to the object
define rectilinear
translation occurs along a straight line
define curvilinear
translation occurs along a curved line
define rotation
all parts of the body move through the same angle in the same time
define scalar
describes only in terms of MAGNITUDE
define vector
describes in terms of MAGNITUDE, DIRECTION and SENSE
define position
location in space relative to a reference
define trajectory
the path followed by the object in motion
define distance
length of a trajectory path
define displacement
change in position between two points in time
