Hello,

Some days ago I wrote (copy paste) using the samples in Javacvpro, this script for face detection using WebCam, which used to work well:

import codeanticode.gsvideo.*;

import monclubelec.javacvPro.*;

import java.awt.*;

PImage imgSrc, imgDest;

Rectangle[] faceRect; 

GSCapture cam;

OpenCV opencv; 

int widthCapture=320; // largeur capture

int heightCapture=240; // hauteur capture

int fpsCapture=20; // framerate (image/secondes) pour la capture video

long millis0=0; // variable de mémorisation de millis

void setup(){

  

colorMode(RGB, 255,255,255); // fixe format couleur R G B pour fill, stroke, etc...

fill(0,0,255); // couleur remplissage RGB - noFill() si pas de remplissage

stroke (0,0,255); // couleur pourtour RGB - noStroke() si pas de pourtour

rectMode(CORNER); // origine rectangle : CORNER = coin sup gauche | CENTER : centre 

imageMode(CORNER); // origine image : CORNER = coin sup gauche | CENTER : centre

ellipseMode(CENTER); // origine cercles / ellipses : CENTER : centre (autres : RADIUS, CORNERS, CORNER

  frameRate(30);// Images par seconde - The default rate is 60 frames per second

        size(widthCapture*2,heightCapture*2); // ouvre une fenêtre xpixels  x ypixels 

background(0,0,0); // couleur fond fenetre

        cam = new GSCapture(this, widthCapture, heightCapture);

        cam.start();

        

opencv = new OpenCV(this); // initialise objet OpenCV à partir du parent This

        opencv.allocate(widthCapture,heightCapture); // crée les buffers image de la taille voulue

        opencv.cascade("FRONTALFACE_ALT", true);

        faceRect = opencv.detect(true);

}

void  draw() {

  

  if (cam.available() == true) { 

      cam.read(); // acquisition d'un frame 

      imgSrc=cam.get(); // récupère l'image GS video dans Pimage

      opencv.copy(imgSrc); // charge l'image dans le buffer openCV

      image(opencv.image(), 0, 0);

      

      faceRect = opencv.detect(true);

      println("numero de caras detectadas =" + faceRect.length + "."); 

      

      opencv.drawRectDetect (0, 0, 1, color(255,255,0), 3 , true, color(0,0,255), true); // tracé avec les paramètres

  }

} 

Today I ran processing with the code and didn’t work, I got this message:

OpenCV Error: Null pointer (Invalid classifier cascade) in cvHaarDetectObjectsForROC, file /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_graphics_opencv/opencv/work/OpenCV-2.3.1/modules/objdetect/src/haar.cpp, line 1041

Exception in thread "Animation Thread" java.lang.RuntimeException: /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_graphics_opencv/opencv/work/OpenCV-2.3.1/modules/objdetect/src/haar.cpp:1041: error: (-27) Invalid classifier cascade in function cvHaarDetectObjectsForROC

at com.googlecode.javacv.cpp.opencv_objdetect.cvHaarDetectObjects(Native Method)

at monclubelec.javacvPro.OpenCV.detect(Unknown Source)

at monclubelec.javacvPro.OpenCV.detect(Unknown Source)

at MyFaceDetect.setup(MyFaceDetect.java:65)

at processing.core.PApplet.handleDraw(Unknown Source)

at processing.core.PGraphics.requestDraw(PGraphics.java:674)

at processing.core.PApplet.run(Unknown Source)

at java.lang.Thread.run(Thread.java:680)

And processing points the problem in:  

        faceRect = opencv.detect(true); 

Has any one experience the same problem? The thing is with another samples Javacvpro works well.

I’m using OSX Lion, I getting crazy traying to fix this, has anyone and idea whats happening?

Salutations.