im.calcHistograms(function(err, hist){})

im.calcHistograms(mask, function(err, hist){})





## Face recognition TODO


// Load Database
// TODO<



cv.loadImage('test.jpg', function(err, im){
	im.detectObject("front-face.xml", {}, function(err, faces){       
		_.each(faces, function(v){
			
			// TODO {
			
			var section = im.slice(v.x, v.y, v.x + v.width, v.y + v.height);
			section.convertGrayscale()
			section.resize(WID, HEIGHT);
			section.equaliseHistogram();

			// } TODO

		})	
	})
})






-----


http://www.athile.net/library/wiki/index.php?title=Library/V8/Tutorial#Wrapping_a_Javascript_function_as_a_std::function.3C.3E

https://www.cloudkick.com/blog/2010/aug/23/writing-nodejs-native-extensions/