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Topic: differenceImage/retinaImage (Read 1376 times) |
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Sprak
 
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differenceImage/retinaImage
« on: May 17th, 2004, 8:20pm » |
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Hi,
I'm having some trouble getting the WebcamXtra functions differenceImage() as well as retinaImage() to work properly. The output from image()/cameraImage() is perfect with a clear picture and good framerate, but as I go over to some other of the pixel functions everything just gets messed up. I've dabbled with all the parameters, setting the adaptivity to a whole bunch of different values, dug into the globs stuff but to no avail. I've been using the WebcamXtra with Director prior to going Processing, and it ran like a charm.
What could be the problem? Any help in this matter would be very much appreciated. Thanks.
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fjoselevich
  
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Re: differenceImage/retinaImage
« Reply #1 on: Jul 15th, 2004, 3:11pm » |
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I've tried it also and got the same problem than you. I'm looking at the code.
Here is an example:
Code:
JMyron m;//a camera object
int xpos = 0;
int ypos = 0;
void setup()
{
size(640, 480);
framerate(25);
m = new JMyron();//make a new instance of the object
m.start(320,240);//start a capture at 320x240
m.findGlobs(1);
m.update();
m.adaptivity(110);
m.adapt();// immediately take a snapshot of the background for differencing
println("Myron " + m.version());
m.findGlobs(1);
}
void loop(){
m.update();//update the camera view
int[] img = m.cameraImage(); ;
for(int j=0;j<4;j++) {
switch(j) {
case 0:
img = m.cameraImage();
break;
case 1:
img = m.retinaImage();
break;
case 2:
img = m.differenceImage();
break;
case 3:
img = m.globsImage();
break;
}
for(int i=0;i<320*240;i++){ //loop through all the pixels
pixels[i+j*320*240] = img[i]; //draw each pixel to the screen
}
}
}
public void stop(){
m.stop();//stop the object
}
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fry
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Re: differenceImage/retinaImage
« Reply #2 on: Jul 15th, 2004, 5:16pm » |
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not sure if this is your problem, but quicktime movies don't have their 'alpha' channel set, so their colors read as completely transparent.
modifying your program to use the following might fix things, if the above is what is causing your problem:
pixels[i+j*320*240] = img[i] | 0xff000000;
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