54 lines
1.6 KiB
Plaintext
54 lines
1.6 KiB
Plaintext
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/**
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* Brightness Tracking
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* by Golan Levin.
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*
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* Tracks the brightest pixel in a live video signal.
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*/
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import processing.video.*;
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Capture video;
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void setup() {
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size(640, 480);
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// Uses the default video input, see the reference if this causes an error
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video = new Capture(this, width, height);
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video.start();
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noStroke();
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smooth();
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}
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void draw() {
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if (video.available()) {
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video.read();
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image(video, 0, 0, width, height); // Draw the webcam video onto the screen
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int brightestX = 0; // X-coordinate of the brightest video pixel
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int brightestY = 0; // Y-coordinate of the brightest video pixel
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float brightestValue = 0; // Brightness of the brightest video pixel
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// Search for the brightest pixel: For each row of pixels in the video image and
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// for each pixel in the yth row, compute each pixel's index in the video
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video.loadPixels();
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int index = 0;
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for (int y = 0; y < video.height; y++) {
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for (int x = 0; x < video.width; x++) {
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// Get the color stored in the pixel
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int pixelValue = video.pixels[index];
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// Determine the brightness of the pixel
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float pixelBrightness = brightness(pixelValue);
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// If that value is brighter than any previous, then store the
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// brightness of that pixel, as well as its (x,y) location
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if (pixelBrightness > brightestValue) {
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brightestValue = pixelBrightness;
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brightestY = y;
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brightestX = x;
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}
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index++;
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}
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}
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// Draw a large, yellow circle at the brightest pixel
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fill(255, 204, 0, 128);
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ellipse(brightestX, brightestY, 200, 200);
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}
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}
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