diva.sketch.features

Class MaxSpeedFE

java.lang.Object

diva.sketch.features.MaxSpeedFE

All Implemented Interfaces:

FeatureExtractor

public class MaxSpeedFE
extends Object
implements FeatureExtractor

MaxSpeedFE computes the maximum speed (squared) along the path of a stroke. This is done by taking every two data points in the path and calculates ((delta X)^2 + (delta Y)^2)/(delta time)^2. At least 2 data points must exist in the path, otherwise 0 is returned. One of Rubine's features.

Version:

$Revision: 1.9 $

Author:

Heloise Hse (hwawen@eecs.berkeley.edu)

Constructor Summary

Constructors

Constructor and Description
MaxSpeedFE()

Method Summary

Modifier and Type	Method and Description
double	apply(TimedStroke s) Return the maximum speed (squared) of the specified stroke.
String	getName() Return the name of this feature extractor.
static double	maxSpeed(TimedStroke s) Return the maximum speed (squared) of the specified stroke.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

MaxSpeedFE

public MaxSpeedFE()

Method Detail

apply

public double apply(TimedStroke s)

Return the maximum speed (squared) of the specified stroke. This is done by taking every two data points in the path and calculates ((delta X)^2 + (delta Y)^2)/(delta time)^2. At least 2 data points must exist in the path, otherwise 0 is returned.

Specified by:

apply in interface FeatureExtractor

getName

public String getName()

Return the name of this feature extractor.

Specified by:

getName in interface FeatureExtractor

maxSpeed

public static double maxSpeed(TimedStroke s)

Return the maximum speed (squared) of the specified stroke. This is done by taking every two data points in the path and calculates ((delta X)^2 + (delta Y)^2)/(delta time)^2. At least 2 data points must exist in the path, otherwise 0 is returned.