contours.js

var cv = require('../lib/opencv');

var lowThresh = 0;
var highThresh = 100;
var nIters = 2;
var maxArea = 2500;

var GREEN = [0, 255, 0]; // B, G, R
var WHITE = [255, 255, 255]; // B, G, R
var RED   = [0, 0, 255]; // B, G, R

cv.readImage('./files/coin1.jpg', function(err, im) {
  if (err) throw err;
  var width = im.width();
  var height = im.height();
  if (width < 1 || height < 1) throw new Error('Image has no size');

  var big = new cv.Matrix(height, width);
  var all = new cv.Matrix(height, width);

  im.convertGrayscale();
  im_canny = im.copy();

  im_canny.canny(lowThresh, highThresh);
  im_canny.dilate(nIters);

  contours = im_canny.findContours();

  for(i = 0; i < contours.size(); i++) {
    if(contours.area(i) > maxArea) {
      var moments = contours.moments(i);
      var cgx = Math.round(moments.m10 / moments.m00);
      var cgy = Math.round(moments.m01 / moments.m00);
      console.log(contours.moments(i));

      // all.rectangle([cgx, cgy], [cgx + 5, cgy + 10], GREEN, 2);
      all.ellipse(cgx + im.width(), cgy + im.height(), 100, 100);
      
      var left = im.width()/3 + im.width()/10

      var center = (im.width() - left) + (im.width()/10)

      var right = im.width()

      console.log(cgx)
      console.log(left)
      console.log(center)
      console.log(right)

      if (cgx > left < right) {
        console.log('center')
      } else if (cgx > center) {
        console.log('right')
      }  else if (cgx < left) {
        console.log('left')
      }

      // all.ellipse(im.width()/2, im.height()/2, 50, 50);


      big.drawContour(contours, i, GREEN);
      big.line([cgx - 5, cgy], [cgx + 5, cgy], RED);
      big.line([cgx, cgy - 5], [cgx, cgy + 5], RED);
    }
  }

  console.log(contours.area(i))
  all.drawAllContours(contours, WHITE);

  big.save('./tmp/big.png');
  all.save('./tmp/all.png');
  console.log('Image saved to ./tmp/big.png && ./tmp/all.png');
});