I am working on a project it is actually originated from the camshift demo and i really wanted to track in a multiple manner. It is done by color matching. I also modified the demo, i added sounding an alarm and a allowable motion for the tracked object. here is the a part of the code that i added to the demo:

`

Rect brect= trackBox.boundingRect();

            if(brect.height<20&&brect.width<20||(brect.x + brect.width)>pt1.x||(brect.height+brect.y)>pt1.y||brect.x<pt2.x||brect.y<pt2.y)
            {

            printf("A L E R T !\n");
            paused = !paused;
            PlaySound(TEXT("ALARM.wav"), NULL, SND_FILENAME|SND_LOOP);
            }
            rectangle(image,brect,Scalar(0,0,255),3,8,0);

What i wanted to happen is to trigger the alarm when another object that is of the same color is present, but i dont know how. Can anyone help how to do multi detect?

How do i change the ellipse to rectangle in camshift demo? is there any sites that shows how? please im a newby on this one. we dont have it tought in school. please help

@StevenPuttermans ; I am using a haartrained xml. i found this program that only marks the object of interest by loading all the pictures (ex. 1000 pictures) on this site http://nayakamitarup.blogspot.com/2011/07/how-to-make-your-own-haar-trained-xml.html. I can't make my system running until I am able to identify what's wrong on it. Please, I really need help on this.

Can any one tell me whats the difference between the other xml from the haarcascade_frontalface_alt.xml? i tried to use the haarcascade_eye_tree_eyeglasses.xml but it cant be loaded... only the frontalface_alt xml.. can somebody explain why this happens..

I am to design and develop a system with camshift and kalman filter on it. I would like to know where I can find links that leads to camshift with kalman filter tutorials or examples that might give a hint to creating my own.

Please help.

@Siegfried, I have executed the example on the link you gave, but this time the error is stating "Native' has exited with code -1 (0xffffffff)". This is the error upon running the example. The problem is similar but this time, the error message did not show up instead it automatically terminates the project. Also when I execute the .exe it runs and produces output similar to the links example.

I have actually placed or stored all the necessary files in the the folder where the project is created. The xml is placed together within the projects folder. I have followed a certain tutorial I found in the internet and somehow i can't identify the problem. I even tested the xml's that came pre-installed in the opencv, but still it can't load the xml. If you could share some links on how to fix this or other examples where I can test it, please let me know.

An xml file could not be loaded when running the project on Visual Studio but the .exe of the project runs perfectly.

const char *cascade_name="output.xml";
int lastX = -1;
int lastY = -1;
void detect_and_draw( IplImage* img )
{

    // Create memory for calculations
    static CvMemStorage* storage = 0;
    // Create a new Haar classifier
    static CvHaarClassifierCascade* cascade = 0;
    // Sets the scale with which the rectangle is drawn with
    int scale = 1;
    // Create two points to represent the hand locations
    //CvPoint pt1, pt2;
    // Looping variable
   // int i;
    // Load the HaarClassifierCascade
    cascade = (CvHaarClassifierCascade*)cvLoad(cascade_name,0,0,0);
    // Check whether the cascade has loaded successfully. Else report and error and quit  

    // Allocate the memory storage
    storage = cvCreateMemStorage(0);
    // Create a new named window with title: result
    cvNamedWindow( "result", 1 );
    // Clear the memory storage which was used before
    cvClearMemStorage( storage );
    if(!cascade)
    {
        fprintf( stderr, "ERROR: Could not load classifier cascade\n" );
        return;
    }
    if( cascade )
    {

        // There can be more than one hand in an image. So create a growable sequence of hands.
        // Detect the objects and store them in the sequence
        CvSeq* hands = cvHaarDetectObjects( img, cascade, storage,
                                            1.1, 2, CV_HAAR_DO_CANNY_PRUNING,
                                            cvSize(40, 40) );

        // Loop the number of hands found.
        for( i = 0; i < (hands ? hands->total : 0); i++ )
        {
           // Create a new rectangle for drawing the hand
            CvRect* r = (CvRect*)cvGetSeqElem( hands, i );

            // Find the dimensions of the hand,and scale it if necessary
            pt1.x = r->x*scale;
            pt2.x = (r->x+r->width)*scale;
            pt1.y = r->y*scale;
            pt2.y = (r->y+r->height)*scale;

            // Draw the rectangle in the input image
            cvRectangle( img, pt1, pt2, CV_RGB(230,20,232), 3, 8, 0 );
        }
    }

    // Show the image in the window named "result"
    cvShowImage( "result", img );

}

can somebody tell me what went wrong?

can somebody explain? i will be using it for tracking..

I have a code already for the classifier training. what i wanted to happen is that, i want to track the object of interest in my trained classifier.

How do I do that? Where do I start? Can you show some links where I can find sample codes on tracking object from classifier?

This is the message returned inside the dialog box:

Null Pointer (Null Object Pointer) in function cvSave, D:\User\VP\opencv\cxcore\src\cxpersistence.cpp(5097)

Does anyone have an idea what this error is about?

I got the program code from this tutorial on HAAR classifier training using positive and negative images, which creates an object xml model. However when creating the xml model the above error appears.

The tutorial has instructions on how to do it. But by following the code, it did not work.

If anyone encountered the error I just received, and has an idea on how to fix it, the please comment or answer this question.

Does anyone have an idea how to use the files in there? If I have to build it, how do I do it? What is the proper procedure or usage of the files?

Please help, if possible, I prefer a Windows based approach, since our product is to be deployed in Windows.

you can only say a yes or no to that.. if you really cAn help... thanks but i already did it before and nobody reponded. thanks for nothing.

can anyone answer this? i really need to start my thesis.

it appears to be that most part of the tutorialHow to build applications with OpenCV inside the Microsoft Visual Studio is in complete. or in accurate. this is the problem that i encounter. i dont have the c/c++ group which is needed in the next tutorial.

if anyone knows how. please answer. i really need your help about this issue.!

this is what appears when i click the properties. it does not have the c/c++ group on DEBUG PROPERTY PAGES

i dont know what is opencv_createsamples utility means but i found an opencv_createsample.exe on bin after creating it on Cmake. i dont know if this is the utility they mean which represents as the CMD of creating samples.

have a question. which command line utility to use when creating a sample. the -vec command, where should i type it. its not on cmd on windows right?

the page loads. on a different network. there could be maybe a security issue detected. i am connecting to our schools network that is why it does not load...it worked before.. i dont know why.but thanks.

Oops! Google Chrome could not connect to docs.opencv.org Try reloading: docs.­opencv.­org/­doc/­tutorials/­introduction/­windows_install/­windows_install.­html Additional suggestions: Access a cached copy of docs.­opencv.­org/­doc/­tutorials/­introduction/­windows_install/­windows_install.­html

this is what shows on my browser. cant open the link.

can anyone give a link on how to create samples(opencv_createsamples) on opencv windows based tutorial. tnx

i cant find the installation for opencv 2.4.5 on windows 7 and the configuration of it to Microsoft Visual Studio 2010. can anyone show me how to.? im trying to make a thesis project using this one and i dont know how to install and configure it. please help.