var cv = require('../lib/opencv'); cv.readImage("./mona.png", function(err, orig) { cv.readImage("./over_text.png", function(err, over_text) { var result = new cv.Matrix(orig.width(), orig.height()); result.addWeighted(orig, 0.7, over_text, 0.9); result.save("/tmp/weighted.png"); }); });