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Topic: videotracking -> differences 2 BImage (Read 1895 times) |
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michael05
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videotracking -> differences 2 BImage
« on: Mar 17th, 2004, 1:28pm » |
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here is another videotracker. it is a part of my diploma "demographic data in augmented reality" (http://digitaleinformationsarchitektur.m05.de).
it takes a reference image of the background to compare all frames from the camera with it. if a person enters the scene it extracts it as a BImage with alpha channel. it returns that image and an array with its size (x1, y1, x2, y2).
you can manipulate that image (filters: invert, clone, proportional fill) or just use the coordinates or both..
there is just a german documentation of the project yet. i will post it when there will be a english documentation.
tracker.java - http://dev.m05.de/p5/trackerDiff/code/Tracker.java
tracker.class - http://dev.m05.de/p5/trackerDiff/code/Tracker.class
to use the tracker in your project put tracker.class in the code folder.
here is a sample to initialize it:
trackerDiff.pde - http://dev.m05.de/p5/trackerDiff/trackerDiff.pde
Tracker t;
boolean bgSet = false;
int tolerance;
float diff;
BImage diffImage, bgImage;
void setup()
{
size(320,240);
noFill();
stroke(#FFFF00);
background(0);
beginVideo(320,240,25);
tolerance = 20; // treshold.. rbg+-value
diff = width/video.width; // relation between screensize and videosize
// initialize the tracker
t = new Tracker();
t.Tracker(tolerance, video.width, video.height);
}
void loop()
{
//background(0);
image(video, 0, 0); // show video
if (bgSet == true)
{
// compare the video image with the reference image
// returns an array with x1, y1, x2, y2 (upper left and bottom right)
int[] rectPoints = t.GetPixelDiff(video, bgImage, diff);
// returns an image of this area with alpha channel
diffImage = t.GetPixelDiffImg();
// draw a rect in this area
rect(rectPoints[0]*diff, rectPoints[1]*diff, (rectPoints[2]-rectPoints[0])*diff, (rectPoints[3]-rectPoints[1])*diff);
}
}
void keyReleased()
{
// make a shot of the background -> reference image
bgImage = t.GetRefBackground(video);
bgSet = true;
}
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°°°°°°°°°°°°°°°°°°°°
http://www.m05.de
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c
Guest
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Re: videotracking -> differences 2 BImage
« Reply #1 on: Mar 29th, 2004, 9:06pm » |
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hi michael
this does only work for mac, doesnt it?
tried it on PC (+VDIG/QT) and there was
a problem with p5 finding Qtjava and
opening eg using the tracker.class.
beste gruesse
christian
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michael05
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Re: videotracking -> differences 2 BImage
« Reply #2 on: Apr 7th, 2004, 8:44pm » |
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hi
i did not try it on a windows pc. but now i ve got dell notebook from my school. i will try it when i find the time.
greetings from the eastcoast
michael
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°°°°°°°°°°°°°°°°°°°°
http://www.m05.de
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