Hi everyone,

i 've got some trouble with the openCV library.

I use GSvideo to capture my IP video source, and I try to
use the Opencv Blob detection.

But the remeber(); fonction doesn't work. I've no error message, just
no image in the opencv memory.

This is a piece of my code:
--------------------------------------------------------------------------------

----------------
import hypermedia.video.*;
import codeanticode.gsvideo.*;

GSPipeline pipe;
OpenCV opencv;

void setup() {

  size( 320, 240 );

  pipe = new GSPipeline(this, "gnomevfssrc location=http://192.168.1.90/axis-cgi/mjpg/video.cgi? ! jpegdec ! ffmpegcolorspace");
  opencv = new OpenCV( this );
  opencv.allocate(160, 120);
}

void draw() {
if (pipe.available()){

  pipe.read();        
  opencv.copy(pipe, 0, 0, 640, 480, 0, 0, 160, 120);    
  image( opencv.image(), 0, 0);              

  opencv.absDiff();                          

  image( opencv.image(OpenCV.MEMORY), 160, 0 );  
  image( opencv.image(), 160, 120 );            
  }
}
void keyPressed() {    
  opencv.remember();  
}
--------------------------------------------------------------------------------

Does anyone have a solution ? an idea ?
Thanks for your help!

hi,

it works when i use the Buffer mode of the remember function
(remember(1)
But when i try to "blob detect", the background substraction is really noisy (bottom image on the left :
http://mcnaze.free.fr/Capture.png)
there is the code
-------------------------------------------------------------------
import hypermedia.video.*;
import codeanticode.gsvideo.*;


OpenCV opencv;
GSPipeline pipe;


int w = 320;
int h = 240;
int threshold = 80;

boolean find=true;

PFont font;

void setup() {

   size( w*2+30, h*2+30);

    pipe = new GSPipeline(this, "gnomevfssrc location=http://Admin:123456@192.168.0.100/cgi-bin/cmd/system?GET_STREAM ! jpegdec ! ffmpegcolorspace ! video/x-raw-rgb, width=640, height=480, bpp=32, depth=24");

   opencv = new OpenCV( this );
   opencv.allocate(640, 480);
   font = loadFont( "AndaleMono.vlw" );
   textFont( font );

   println( "Drag mouse inside sketch window to change threshold" );
   println( "Press space bar to record background image" );

}

void draw() {

   background(0);
   opencv.read();
   
    if (pipe.available()){
     
    pipe.read();
    opencv.copy(pipe, 0, 0, 640, 480, 0, 0, 320, 240);
   
 

   image( opencv.image(), 10, 10 );                
   image( opencv.image(), 20+w, 10 );  
   image( opencv.image(OpenCV.MEMORY), 10, 20+h );
   
   opencv.threshold(threshold);
   opencv.absDiff();
   
   image( opencv.image(OpenCV.GRAY), 20+w, 20+h ); // absolute difference image


   // working with blobs
   Blob[] blobs = opencv.blobs( 100, w*h/3, 20, true );

   noFill();
   pushMatrix();
   translate(20+w,20+h);
   
   for( int i=0; i<blobs.length; i++ ) {

       Rectangle bounding_rect      = blobs[i].rectangle;
       float area = blobs[i].area;
       float circumference = blobs[i].length;
       Point centroid = blobs[i].centroid;
       Point[] points = blobs[i].points;

       // rectangle
       noFill();
       stroke( blobs[i].isHole ? 128 : 64 );
       rect( bounding_rect.x, bounding_rect.y, bounding_rect.width, bounding_rect.height );


       // centroid
       stroke(0,0,255);
       line( centroid.x-5, centroid.y, centroid.x+5, centroid.y );
       line( centroid.x, centroid.y-5, centroid.x, centroid.y+5 );
       noStroke();
       fill(0,0,255);
       text( area,centroid.x+5, centroid.y+5 );


       fill(255,0,255,64);
       stroke(255,0,255);
       if ( points.length>0 ) {
           beginShape();
           for( int j=0; j<points.length; j++ ) {
               vertex( points[j].x, points[j].y );
           }
           endShape(CLOSE);
       }

       noStroke();
       fill(255,0,255);
       text( circumference, centroid.x+5, centroid.y+15 );

   }
   popMatrix();
    }
}

void keyPressed() {
   if ( key==' ' ) opencv.remember(1);
}

void mouseDragged() {
   threshold = int( map(mouseX,0,width,0,255) );
}

public void stop() {
   opencv.stop();
   super.stop();
}

Is there a solution, or another way to blobtrack with GsVideo.
Thanks a lot for your help

hey how did you get the gnomevfssrc thingy to work? i get an exception when i do pipe.read();

Code:

Exception in thread "Animation Thread" java.nio.BufferUnderflowException
	at java.nio.HeapIntBuffer.get(HeapIntBuffer.java:127)
	at java.nio.IntBuffer.get(IntBuffer.java:675)
	at codeanticode.gsvideo.GSPipeline.read(GSPipeline.java:146)
	at GettingStartedCaptureLinux.draw(GettingStartedCaptureLinux.java:58)
	at processing.core.PApplet.handleDraw(PApplet.java:1425)
	at processing.core.PApplet.run(PApplet.java:1327)
	at java.lang.Thread.run(Thread.java:619) 

EDIT: Got it working! Is there any chance that this would also run on a windows box?