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Motion detector example
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@sarxos
sarxos committed Nov 18, 2012
1 parent adc93ca commit 26b47d6
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4 changes: 2 additions & 2 deletions pom.xml
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<module>webcam-capture-driver-ipcam</module>
<module>webcam-capture-driver-jmf</module>
<!-- below ones cannot be released since all of them require external 3rd-party repos -->
<!--
<module>webcam-capture-driver-civil</module>
<module>webcam-capture-driver-openimaj</module>
<module>webcam-capture-driver-vlcj</module>
<module>webcam-capture-driver-javacv</module>
-->
<module>webcam-capture-examples</module>
<module>webcam-capture-pages</module>
</modules>

<properties>
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23 changes: 23 additions & 0 deletions webcam-capture-examples/pom.xml
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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

<modelVersion>4.0.0</modelVersion>

<parent>
<groupId>com.github.sarxos</groupId>
<artifactId>webcam-capture-parent</artifactId>
<version>0.3.5</version>
</parent>

<artifactId>webcam-capture-examples</artifactId>
<packaging>pom</packaging>

<name>Webcam Capture Examples</name>
<description>Parent POM for Webcam Capture examples set</description>

<modules>
<module>webcam-capture-applet</module>
<module>webcam-capture-motiondetector</module>
</modules>

</project>
2 changes: 1 addition & 1 deletion webcam-capture-examples/webcam-capture-applet/pom.xml
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<parent>
<groupId>com.github.sarxos</groupId>
<artifactId>webcam-capture-parent</artifactId>
<artifactId>webcam-capture-examples</artifactId>
<version>0.3.5</version>
</parent>

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31 changes: 31 additions & 0 deletions webcam-capture-examples/webcam-capture-motiondetector/.classpath
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<?xml version="1.0" encoding="UTF-8"?>
<classpath>
<classpathentry kind="src" output="target/classes" path="src/main/java">
<attributes>
<attribute name="optional" value="true"/>
<attribute name="maven.pomderived" value="true"/>
</attributes>
</classpathentry>
<classpathentry kind="src" output="target/test-classes" path="src/test/java">
<attributes>
<attribute name="optional" value="true"/>
<attribute name="maven.pomderived" value="true"/>
</attributes>
</classpathentry>
<classpathentry excluding="**" kind="src" output="target/classes" path="src/main/resources">
<attributes>
<attribute name="maven.pomderived" value="true"/>
</attributes>
</classpathentry>
<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.6">
<attributes>
<attribute name="maven.pomderived" value="true"/>
</attributes>
</classpathentry>
<classpathentry kind="con" path="org.eclipse.m2e.MAVEN2_CLASSPATH_CONTAINER">
<attributes>
<attribute name="maven.pomderived" value="true"/>
</attributes>
</classpathentry>
<classpathentry kind="output" path="target/classes"/>
</classpath>
23 changes: 23 additions & 0 deletions webcam-capture-examples/webcam-capture-motiondetector/.project
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<?xml version="1.0" encoding="UTF-8"?>
<projectDescription>
<name>webcam-capture-example-motiondetector</name>
<comment></comment>
<projects>
</projects>
<buildSpec>
<buildCommand>
<name>org.eclipse.jdt.core.javabuilder</name>
<arguments>
</arguments>
</buildCommand>
<buildCommand>
<name>org.eclipse.m2e.core.maven2Builder</name>
<arguments>
</arguments>
</buildCommand>
</buildSpec>
<natures>
<nature>org.eclipse.jdt.core.javanature</nature>
<nature>org.eclipse.m2e.core.maven2Nature</nature>
</natures>
</projectDescription>
17 changes: 17 additions & 0 deletions webcam-capture-examples/webcam-capture-motiondetector/README.md
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# Webcam Capture Motion Detector Example

This is simple application illustrating of how to use build-in motion detector.

## Detect Motion

Detector use data from webcam and perform numeric analysis to decide if there
is a motion, or there is none.

This sample application uses ```while / isMotion()``` approach (the second way
to use motion detector is listener approach). It display Me Gusta Guy when motion
has been detected and Forever Alone Guy when no motion has been detected. In this
example motion inertia is 1000 milliseconds.

Some screenshoots:


51 changes: 51 additions & 0 deletions webcam-capture-examples/webcam-capture-motiondetector/pom.xml
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

<modelVersion>4.0.0</modelVersion>

<parent>
<groupId>com.github.sarxos</groupId>
<artifactId>webcam-capture-examples</artifactId>
<version>0.3.5</version>
</parent>

<artifactId>webcam-capture-example-motiondetector</artifactId>
<packaging>jar</packaging>

<name>Webcam Capture - Motion Detector Example</name>
<description>Example of how to use Webcam Capture motion detector</description>

<dependencies>
<dependency>
<groupId>com.github.sarxos</groupId>
<artifactId>webcam-capture</artifactId>
<version>${project.version}</version>
</dependency>
</dependencies>

<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>2.0</version>
<configuration>
<artifactSet>
<includes>
<include>*:*</include>
</includes>
</artifactSet>
</configuration>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>

</project>
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98 changes: 98 additions & 0 deletions ...am-capture-motiondetector/src/main/java/com/github/sarxos/webcam/DetectMotionExample.java
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package com.github.sarxos.webcam;

import java.awt.Dimension;
import java.awt.FlowLayout;
import java.io.IOException;

import javax.imageio.ImageIO;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;


/**
* Detect motion.
*
* @author Bartosz Firyn (SarXos)
*/
public class DetectMotionExample extends JFrame implements Runnable {

/**
*
*/
private static final long serialVersionUID = -585739158170333370L;

private static final int INTERVAL = 100; // ms

private ImageIcon motion = null;
private ImageIcon nothing = null;
private JLabel label = null;

private Webcam webcam = Webcam.getDefault();
private int threshold = WebcamMotionDetector.DEFAULT_THREASHOLD;
private int inertia = 1000; // how long motion is valid

public DetectMotionExample() {

try {
motion = new ImageIcon(ImageIO.read(getClass().getResourceAsStream("/me-gusta.png")));
nothing = new ImageIcon(ImageIO.read(getClass().getResourceAsStream("/forever-alone.png")));
} catch (IOException e) {
e.printStackTrace();
}

label = new JLabel(nothing);

Thread updater = new Thread(this, "updater-thread");
updater.setDaemon(true);
updater.start();

setTitle("Rage Motion Detector");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLayout(new FlowLayout());

webcam.setViewSize(new Dimension(320, 240));

WebcamPanel panel = new WebcamPanel(webcam);
panel.setFPS(4);

add(panel);
add(label);

pack();
setVisible(true);
}

public static void main(String[] args) throws InterruptedException {
new DetectMotionExample();
}

@Override
public void run() {

WebcamMotionDetector detector = new WebcamMotionDetector(webcam, threshold, inertia);
detector.setInterval(INTERVAL);
detector.start();

while (true) {

Icon icon = label.getIcon();
if (detector.isMotion()) {
if (icon != motion) {
label.setIcon(motion);
}
} else {
if (icon != nothing) {
label.setIcon(nothing);
}
}

try {
Thread.sleep(INTERVAL * 2);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
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28 changes: 0 additions & 28 deletions webcam-capture/src/example/java/com/github/sarxos/webcam/DetectMotionExample2.java
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2 changes: 1 addition & 1 deletion webcam-capture/src/example/resources/logback.xml
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</layout>
</appender>

<root level="debug">
<root level="error">
<appender-ref ref="STDOUT" />
</root>
</configuration>
4 changes: 3 additions & 1 deletion webcam-capture/src/main/java/com/github/sarxos/webcam/WebcamMotionDetector.java
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Expand Up @@ -24,6 +24,8 @@ public class WebcamMotionDetector {

private static final Logger LOG = LoggerFactory.getLogger(WebcamMotionDetector.class);

public static final int DEFAULT_THREASHOLD = 25;

/**
* Create new threads for detector internals.
*
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* @param webcam web camera instance
*/
public WebcamMotionDetector(Webcam webcam) {
this(webcam, 25, 0);
this(webcam, DEFAULT_THREASHOLD, 0);
}

public void start() {
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8 comments on commit 26b47d6

@settaratici
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hi sarxos,

how can i check previous detected motion's time ?
pls help me..

@sarxos
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@sarxos sarxos commented on 26b47d6 Aug 7, 2014

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Why not add WebcamMotionListener and store timestamp on motionDetected(..) to be read later?

https://github.com/sarxos/webcam-capture/blob/master/webcam-capture/src/example/java/DetectMotionExample.java

@settaratici
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actually, i want to check if motion is finished and check if inertia is fine take a snapshot..

@sarxos
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@sarxos sarxos commented on 26b47d6 Aug 7, 2014

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Detector is doing this inside. What you want is probably:

Webcam webcam = Webcam.getDefault();

WebcamMotionDetector detector = new WebcamMotionDetector(webcam);
detector.setInertia(2000); // set inertia time to e.g. 2 seconds
detector.setInterval(100); // check motion once per 100 ms

// this will be true for 2 seconds from the last motion detection (inertia time)
while (detector.isMotion()) { 
    Thread.sleep(100);
}

image = webcam.getImage();

@settaratici
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By this way we cannot learn "no-motion".

        Webcam webcam = Webcam.getWebcams().get(1);
    WebcamMotionDetector detector = new WebcamMotionDetector(webcam);
    detector.setInterval(1000);
            detector.setInertia(500);
    detector.start();


    while (true)
    {
        if (detector.isMotion())
        {
            // motion detected
        }
        else
        {
            // motion finished and 
    // if inertia after motion is greater than 500 ms
    // get image 
        }


    }

@sarxos
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@sarxos sarxos commented on 26b47d6 Aug 7, 2014

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Why not? This is exactly what you are doing. When detector.isMotion() is false after it was true before, we know for sure that there was no motion in last 500 ms.

The only invalid thing in your case is interval vs inertia setting because interval MUST be at least 2x smaller than inertia (because motion sampling can be treated as a discrete signal which must be processed in accordance to Nyquist–Shannon theorem). In other words, when the above is not true, for time t = interval - inertia, if and only if it is positive, detector will be in state when motion has been already forgotten (due to inertia time), but the next check will be in t, so someone can move, and detector will not be able to detect this.

The meaning of both these settings is:

  • interval = delay between consecutive checks validating if there is a motion on image (1 / interval = sampling rate)
  • inertia = for how long, after motion has been detected, it stays in such state (i.e. return true on isMotion() calls)
Webcam webcam = Webcam.getWebcams().get(1);
WebcamMotionDetector detector = new WebcamMotionDetector(webcam);
detector.setInterval(100); // do motion check once per 100 ms
detector.setInertia(2000); // remember motion for 2000 ms
detector.start();

boolean motion = false;

while (true) {
  if (detector.isMotion()) {
    motion = true;
  } else {
    if (motion) {
      // there was no-motion in last 2000 ms, but before this there was some motion
      // get image
      motion = false;
    }
  }
  Thread.sleep(10); // MUST be much smaller than interval
}

@sarxos
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@sarxos sarxos commented on 26b47d6 Aug 8, 2014

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@settaratici, if you had problems with motion detection and false positives this may be caused by #250 I just fixed. Because of this bug there can be false no-motion moments detected.

The newest snapshot JAR already contain the fix. You can found it here:

webcam-capture-0.3.10-SNAPSHOT.jar

Please check and verify against your code. Moreover, I crafted small example to demonstrate how to detect "motion begin" and "motion end" moments using loop and custom inertia time. This example can be found here:

DetectMotionEventsExample.java

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It works fine. Thank you :)) Now, i can check if motion is finished.

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