var cv = require('../lib/opencv'); cv.readImage("./examples/files/car1.jpg", function(err, car1) { if (err) throw err; cv.readImage("./examples/files/car2.jpg", function(err, car2) { if (err) throw err; cv.ImageSimilarity(car1, car2, function (err, dissimilarity) { if (err) throw err; console.log('Dissimilarity: ', dissimilarity); }); }); });