movement_index

#Movement Index

##Description The Movement Index module computes the amount of movement or variation within an N-dimensional signal over a given time window. The Movement Index class is good for extracting features that describe how much movement is occurring in an N-dimensional signal over time. An example application might be to use the MovementIndex in combination with one of the GRT classification algorithms to determine if an object is being moved or held still.

The Movement Index class is part of the Feature Extraction Modules.

An example of the features output from the MovementIndex module. This example shows a recording of a 3 dimensional accelerometer signal (top graph), you should be able to identify how the accelerometer was shaken 5 times. The first two shakes were short left (shake 1) then right (shake 2) shakes. The remaining 3 shakes were longer shakes, primarily in the X (shake 3), Y (shake 4), and Z (shake 5) axis. The lower graph shows the output features from the MovementIndex.

##Applications The Movement Index class is good for extracting features that describe how much movement is occurring in an N dimensional signal.

##Example Movement Index Example