OPENCV with NodeJS

var express = require('express');
var app = express();
var multipart = require('connect-multiparty');
var multipartMiddleware = multipart();
var cv = require('opencv');
var fs = require('fs');

app.post('/upload', multipartMiddleware, function (req, res) {
    console.log("Control in the upload the image", req.files.file.path);
    var filePath = req.files.file.path;
    var fileExtension = req.files.file.name.split('.');
     cv.readImage(filePath, function (err, im) {
        console.log(err, "control in the cv", im);
        im.detectObject(cv.FACE_CASCADE, {}, function (err, faces) {
            console.log("Total number of faces", faces.length);
            for (var i = 0; i < faces.length; i++) {
                var x = faces[i];
                im.ellipse(x.x + x.width / 2, x.y + x.height / 2, x.width / 2, x.height / 2);
            }
            var storeFileName = new Date().getTime();
            var destinationPath = './images/' + storeFileName + "." + fileExtension[fileExtension.length - 1];
            im.save(destinationPath);
            res.send({
               object:"total number of faces : "+faces.length,
               message:"See the image with face eclipise on images folder"
            })
        });
    })
});



app.listen(4000, function () {
    console.log('Example app listening on port 4000!');
});
 

THANKS