detecting motion in a videostream and finding pixel locations...

MartinVDL

I wrote a sketch to find the motion outlines using opencv. I then use the getPoints function to find the PVectors to use for placing particles. It works quite well but I'm worried about performance when I try to upscale this to hd video stream. I'm fairly new to Processing so can anyone tell me if there is a more efficient way of doing this? TIA My code (not including the Particle class but that just a simple class): ` import gab.opencv.*; import processing.video.*; import java.awt.*;

Capture video; OpenCV opencv; ArrayList contourPoints = new ArrayList (); ArrayList particles; PVector loc = new PVector (0,0);

void setup() { size(640, 480, P2D); video = new Capture(this, 640, 480); opencv = new OpenCV(this, 640, 480); particles = new ArrayList();

opencv.startBackgroundSubtraction(5, 3, 0.5);

video.start(); }

void draw() { background(255); opencv.loadImage(video);

opencv.updateBackground();

opencv.dilate(); opencv.erode();

for (Contour contour : opencv.findContours()) { contourPoints = contour.getPoints(); for (int i = 0; i < contourPoints.size()-10; i=i+10) { loc = contourPoints.get(i); particles.add(new Particle(new PVector(loc.x,loc.y))); } } // Looping through backwards to delete for (int i = particles.size()-1; i >= 0; i--) { Particle p = particles.get(i); p.run(); if (p.isDead()) { particles.remove(i); } } // println(frameRate); }

void captureEvent(Capture c) { c.read(); }`

SiriusCG

Please highlight the code in your post then hit Ctrl+O to format it. Makes it a whole lot easier to read. Cheers.

MartinVDL

Oops sorry. I did use the "code" icon at the top but doesn't work I guess. I tried it again, also CNRTL-O but that doesn't work either - just brings up IExplorer's "open" dialog. I re-formatted it by hand and hope it is saved when I post this.

Capture video;
OpenCV opencv; 
ArrayList contourPoints = new ArrayList (); 
ArrayList particles; 
PVector loc = new PVector (0,0);

void setup() { 
size(640, 480, P2D); 
video = new Capture(this, 640, 480); 
opencv = new OpenCV(this, 640, 480); 
particles = new ArrayList();
opencv.startBackgroundSubtraction(5, 3, 0.5);
video.start(); 
}

void draw() {

background(255); 
opencv.loadImage(video);
opencv.updateBackground();
opencv.dilate(); opencv.erode();

for (Contour contour : opencv.findContours()) {
    contourPoints = contour.getPoints(); 
    for (int i = 0; i < contourPoints.size()-10; i=i+10) { 
        loc = contourPoints.get(i); 
        particles.add(new Particle(new PVector(loc.x,loc.y))); 
    } 
} 

// Looping through backwards to delete 
for (int i = particles.size()-1; i >= 0; i--) { 
    Particle p = particles.get(i); 
    p.run(); 
    if (p.isDead()) { 
    particles.remove(i); 
 } 
} 
// println(frameRate); }

void captureEvent(Capture c) { c.read(); }

MartinVDL

Btw, why was my post moved into the kinect topic? I'm just using a webcam, not a kinect.