I implemented a face recognition system based on OpenCV HaarCascadeClassifier and eigenfaces. Now I want to review the code and use new functionality of OpenCV.

I start to read and I found the next text:

flags – This parameter is not used for new cascade and have the same meaning for old cascade as in function cvHaarDetectObjects.

It’s mean that cascades trained with the new traincascade app doesn`t supprot this flags? Some of them are very usefuls sometimes.

Thanks for your answers!

I suspect you encounted the issue with non-initialization of static haar_type variable inside harr.cpp. During initialization of haar_type variable, some important information is registered, that is used later to help parse XML file during cvLoad call. Depending on OpenCV version, operation system and static vs dynamic library linkage, it might happen that this static variable is not initialized before cvLoad is invoked, and then you may get this error.
To resolve the issue, you need to invoke some function in object detection library *before* invoking cvLoad for haar cascade file. This forces initialization of all static variables including haar_type.
cvReleaseHaarClassifierCascade with pointer to empty cascade worked fine for me.
…
CvHaarClassifierCascade * cascade = 0;
cvReleaseHaarClassifierCascade(&cascade);
cascade = (CvHaarClassifierCascade) cvLoad(path);
…

Best regards,
Sergey

I tried to create a image and release it afterwords, but it did work =(

I got it and it works ^^

Your directory structure should loks like this:
…/haarcascade/
0/AdaBoostCARTHaarClassifier.txt
1/AdaBoostCARTHaarClassifier.txt
2/AdaBoostCARTHaarClassifier.txt
3/AdaBoostCARTHaarClassifier.txt
4/AdaBoostCARTHaarClassifier.txt
5/AdaBoostCARTHaarClassifier.txt
6/AdaBoostCARTHaarClassifier.txt
7/AdaBoostCARTHaarClassifier.txt
8/AdaBoostCARTHaarClassifier.txt
9/AdaBoostCARTHaarClassifier.txt
10/AdaBoostCARTHaarClassifier.txt
11/AdaBoostCARTHaarClassifier.txt
12/AdaBoostCARTHaarClassifier.txt
13/AdaBoostCARTHaarClassifier.txt
14/AdaBoostCARTHaarClassifier.txt
15/AdaBoostCARTHaarClassifier.txt
…/haarcascade.xml

http://opencv.sourcearchive.com/documentation/1.0.0-6.1/cxpersistence_8cpp-source.html

It seems to be a bug (see these links):
http://www.openframeworks.cc/forum/viewtopic.php?f=10&t=1853
http://opencv-users.1802565.n2.nabble.com/face-detection-cvLoad-td4467872.html

The error appears by loading the cascade:
CvHaarClassifierCascade *cascade;
char *cascadeName = “haarcascade.xml”;

// load the classifier
cascade = ( CvHaarClassifierCascade* )cvLoad( cascadeName, 0, 0, 0 );

// initialize memory buffer for the face detector
storage = cvCreateMemStorage( 0 );
cvLoads loads object from file. It provides a simple interface to cvRead. After object is loaded, the file storage is closed and all the temporary buffers are deleted. Thus, to load a dynamic structure, such as sequence, contour or graph, one should pass a valid destination memory storage to the function.

p.s. What means FileNode? :[

2.
I don’t use any command, because the console close after compiling the program.

I am working on haar training of different hand gestures………… how multiple cascades are loaded into the system simultaneously, and each cascade is responsible for a specific hand posture. Is there anyway to do it……….. plz help me out in this

regards