2004cv4_centroid

// computer vision test

// hipster burglar alarm

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var capture, previous, diff;

var carray = new Array(32); // centroid array

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var thresh = 30;

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function preload() {

}

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function setup() {

  createCanvas(windowWidth, windowHeight);

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  capture = createCapture(VIDEO); // this opens up the camera

  pixelDensity(1); // turns off oversampling ("retina display")

  capture.size(32, 32); // this is in pixels

  capture.hide(); // telling the browser to hide the camera so we can draw it ourselves

  previous = createImage(32, 32); // create an empty picture

  diff = createImage(32, 32); // create an empty picture

  for(let i = 0;i<carray.length;i++)

  {

    carray[i] = new Array(32);

    for(let j = 0;j<carray[i].length;j++)

    {

      carray[i][j] = new Array(2);

    }

  }

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}

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function draw() {

  background(0);

  capture.loadPixels();

  previous.loadPixels();

  diff.loadPixels();

  noSmooth();

  var x, y;

  for(let i = 0;i<capture.pixels.length;i+=4)

  {

    let avg = (abs(capture.pixels[i]-previous.pixels[i]) + abs(capture.pixels[i+1]-previous.pixels[i+1]) + abs(capture.pixels[i+2]-previous.pixels[i+2]))/3;

    diff.pixels[i]=(avg>thresh)*255;

    diff.pixels[i+1]=(avg>thresh)*255;

    diff.pixels[i+2]=(avg>thresh)*255;

    diff.pixels[i+3]=255;

    // x = floor(i/4)%capture.pixels.width;

    // y = floor((i/4)/capture.pixels.width);

    x = 10;

    y = 10;

    if(avg>thresh)

    {

      carray[x][y][0] = x;

      carray[x][y][1] = y;

    }

    else {

      carray[x][y][0] = 0;

      carray[x][y][1] = 0;

    }

  }

  diff.updatePixels();

  for(let i = 0;i<capture.pixels.length;i++)

  {

    previous.pixels[i] = capture.pixels[i];

  }

  previous.updatePixels();

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  image(capture, 0, 0, width/2, height/2);

  image(diff, width/2, 0, width/2, height/2);

  textSize(80);

  fill(255);

  // text(s[0], width/2, height/2 + 80);

  // text(s[1], width/2, height/2 + 160);

  // text(s[2], width/2, height/2 + 240);

  // text(s[3], width/2, height/2 + 320);

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}

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