Hough

// noprotect

​

let img = null;

let grayImg = null;

let edgeImg = null;

​

const kernel = [[ -1, -1, -1],

                [ -1,  8, -1],

                [ -1, -1, -1]];

​

function preload() {

  const w = windowWidth/200;

  const h = windowHeight/100;

  img = loadImage("IMG_1148.JPG");

  img.resize(w,h);  

  grayImg = loadImage("IMG_1148.JPG");

  grayImg.resize(w,h);

​

  edgeImg = loadImage("IMG_1148.JPG");

  edgeImg.resize(w,h);

}

​

function setup() {

  createCanvas(windowWidth, windowHeight);

  grayImg.filter(GRAY);

  grayImg.loadPixels();

  edgeImg.loadPixels();

  for(let x = 1; x <  grayImg.width-1; x++){

    for(let y = 1; y <  grayImg.height-1; y++){

      let sum = 128;

      for (let ky = -1; ky <= 1; ky++) {

        for (let kx = -1; kx <= 1; kx++) {

          let pos = (y + ky)*grayImg.width + (x + kx);

          let val = grayImg.pixels[pos][0];

​

          sum += kernel[ky+1][kx+1] * val;

        }

      }

​

      edgeImg.pixels[y*edgeImg.width + x] = color(sum);

    }

  }

  edgeImg.updatePixels();

}

​

function draw() {

  image(img, 0, 0, windowWidth/2, windowHeight);

  image(edgeImg, windowWidth/2, 0, windowWidth/2, windowHeight);

}