Easy Motion Detection

• Download demo project - 53.13 KB
• Download source - 24.28 KB

Introduction

When I worked on another project, I got this method to implement motion detection.

I tried some other ways to do this motion detection. But I got frustrated when I used them. Because I don't really need any advanced algorithms to do this one, I thought a little and got a nice idea to do it. And you can also do it now.

Just about 5 lines in Visual C++ .NET code and a few lines in Flash Action Script.

Background + Prerequisites

You should have pre-installed the .NET version 1.1 and Flash player 6 or higher for testing this code. They are freely available at the links given below:

• .NET 1.1 redistributable package
• Flash player

Using the Code

The first message comes when the application starts. The others come when it detects motion. The camera preview part and the motion detecting part are actually being done by the flash scripts. Finally the Visual C++ .NET application gets the motion via VC COM interface fscommand();

//get the real camera & set the motion level + quality
camera = Camera.get();
camera.setMotionLevel(25, 2);
camera.setQuality(0,5);

//embedded video object
myVideoObject.hide();
//get the preview
myVideoObject.attachVideo(camera);

//call when camera detects a motion
camera.onActivity = function(mode)
{
    if (mode)
    {
        trace("Kawru hari awa. Camerawa langata.");
        //get into the Visual C++
        fscommand("MOTION_DETECTED", "OK");
    }
};

Camera.get(); will return the camera object with the default connected interface. Then we can set the motion level and the quality. Finally attach the camera object to the Embedded Video object.

When activity happens, it gives the feed into the VC++.

private: 
    AxInterop::ShockwaveFlashObjects::AxShockwaveFlash*  axShockwaveFlash1;

    String* sFlashPath = System::Environment::CurrentDirectory;
    String* sCurrentDir = sFlashPath;
    //set the path of GUI
    file = new String("\\detector.swf");
    sFlashPath = String::Concat(sFlashPath, file);

    iStartApp = 0;

    //load Main detector GUI
    axShockwaveFlash1->LoadMovie(0, sFlashPath);

In Visual C++ .NET, just use the axShockwaveFlash COM interface to load the Main Flash GUI. Then use axShockwaveFlash1_FSCommand event to interface with the COM.

Additional Resources

• Macromedia Flash Live Doc (Camera class)