CheckIMG.BrowseFolder = function() {
    dir += '/';
    var FileName = null;
    fs.readdir(dir, function(err, files) {
        if (err)
            throw err;
        async.eachSeries(files, function( file, iter)
        {
            if (err)
                throw err;
            setTimeout(function () {
                fs.readFile(dir + file, function(err, data) {
                    if (err) {
                        setTimeout(iter, 3000);
                        throw err;
                    }
                    var FileName = dir + file;
                    CheckIMG.LoadImage(data, function(err, callback) {
                        if (err) {
                            setTimeout(iter, 300);
                            throw err;
                        }
                        else {
                            var bool = CheckIMG.AveragePixelColor(callback.imageData, callback.width, callback.height);
                            if (bool === false) {
                                console.log("delete file : " + FileName)
                                //fs.unlinkSync(FileName);
                            }
                        }
                    });
                });
                iter();
            }, 300);
        }, function(err) {
            console.log('Done');
        });
    });
}