64 lines
1.8 KiB
Plaintext
64 lines
1.8 KiB
Plaintext
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/**
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* Brightness Thresholding
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* by Golan Levin.
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*
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* Determines whether a test location (such as the cursor) is contained within
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* the silhouette of a dark object.
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*/
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import processing.video.*;
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color black = color(0);
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color white = color(255);
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int numPixels;
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Capture video;
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void setup() {
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size(640, 480); // Change size to 320 x 240 if too slow at 640 x 480
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strokeWeight(5);
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// This the default video input, see the GettingStartedCapture
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// example if it creates an error
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video = new Capture(this, width, height);
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// Start capturing the images from the camera
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video.start();
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numPixels = video.width * video.height;
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noCursor();
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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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video.loadPixels();
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int threshold = 127; // Set the threshold value
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float pixelBrightness; // Declare variable to store a pixel's color
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// Turn each pixel in the video frame black or white depending on its brightness
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loadPixels();
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for (int i = 0; i < numPixels; i++) {
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pixelBrightness = brightness(video.pixels[i]);
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if (pixelBrightness > threshold) { // If the pixel is brighter than the
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pixels[i] = white; // threshold value, make it white
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}
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else { // Otherwise,
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pixels[i] = black; // make it black
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}
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}
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updatePixels();
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// Test a location to see where it is contained. Fetch the pixel at the test
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// location (the cursor), and compute its brightness
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int testValue = get(mouseX, mouseY);
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float testBrightness = brightness(testValue);
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if (testBrightness > threshold) { // If the test location is brighter than
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fill(black); // the threshold set the fill to black
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}
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else { // Otherwise,
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fill(white); // set the fill to white
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}
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ellipse(mouseX, mouseY, 20, 20);
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}
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}
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