motion tracking

Programming Questions

imt_proce..

in Programming Questions • 2 years ago

hi, everyone

i've tried frame differencing method for tracking moving objects but not satisfying.

does any one know how to track the coordinates of moving objects.

any help will be great

thx

Replies(3)

cedrickie..

Re: motion tracking

2 years ago

the question if a method is good or not heavily depends on the setting you have.
what do you want to track where... how does the cam image looks like?

imt_proce..

sorry for late reply. i've tried following method which compares the diff. in color of previous & current frame with threshold value. problem is that it detects the edges too.[may be because of light]

import processing.video.*;
Capture video;
PImage prevFrame;
float threshold = 50;
void setup()
{
video = new Capture(this, width, height, 30);
prevFrame = createImage(video.width,video.height,RGB);
}
void draw()
{
if (video.available())
{
prevFrame.copy(video,0,0,video.width,video.height,0,0,video.width,video.height);
prevFrame.updatePixels();
video.read();
}
loadPixels();
video.loadPixels();
prevFrame.loadPixels();
for (int x = 0; x < video.width; x ++ )
{
for (int y = 0; y < video.height; y ++ )
{
int loc = x + y*video.width; // Step 1, what is the 1D pixel location
color current = video.pixels[loc]; // Step 2, what is the current color
color previous = prevFrame.pixels[loc]; // Step 3, what is the previous color
// Step 4, compare colors (previous vs. current)
float r1 = (current>> 16) & 0xFF;
float g1 = (current>> 8) & 0xFF;
float b1 = current & 0xFF;
float r2 = (previous>> 16) & 0xFF;
float g2 = (previous>> 8) & 0xFF;
float b2 = previous & 0xFF;
float diff = dist(r1,g1,b1,r2,g2,b2); // Step 5, How different are the colors?
// If the color at that pixel has changed, then there is motion at that pixel.
if (diff > threshold)
{
// If motion, display black
pixels[loc] = color(0,255,0);
ax.add(x); // store x-pos in arraylist
ay.add(y); //store y-pos in arraylist
}
else
{
//If not, display white
pixels[loc] = current;
}
}
}
}