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Video Tracking/Tracing over Time (Read 749 times)
Video Tracking/Tracing over Time
Dec 16th, 2009, 4:43am
 
hi, i was wondering how to use the pixel array to use the previous stored pixelvalue, so that i can track the brightestpixel over time, creating a permanent trace. anyone has any idea how it could be done, starting from the sketch below??

Code:
import processing.video.*;

Capture video;

void setup() {
size(640, 480); // Change size to 320 x 240 if too slow at 640 x 480
// Uses the default video input, see the reference if this causes an error
video = new Capture(this, width, height, 30);
noStroke();
smooth();
}

void draw() {
if (video.available()) {
video.read();
image(video, 0, 0, width, height); // Draw the webcam video onto the screen
int brightestX = 0; // X-coordinate of the brightest video pixel
int brightestY = 0; // Y-coordinate of the brightest video pixel
float brightestValue = 0; // Brightness of the brightest video pixel
// Search for the brightest pixel: For each row of pixels in the video image and
// for each pixel in the yth row, compute each pixel's index in the video
video.loadPixels();
int index = 0;
for (int y = 0; y < video.height; y++) {
for (int x = 0; x < video.width; x++) {
// Get the color stored in the pixel
int pixelValue = video.pixels[index];
// Determine the brightness of the pixel
float pixelBrightness = brightness(pixelValue);
// If that value is brighter than any previous, then store the
// brightness of that pixel, as well as its (x,y) location
if (pixelBrightness > brightestValue) {
brightestValue = pixelBrightness;
brightestY = y;
brightestX = x;
}
index++;
}
}
// Draw a large, yellow circle at the brightest pixel
fill(255, 204, 0, 128);
ellipse(brightestX, brightestY, 200, 200);
}
}
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