While using Windows 8 Pro Tablet ( Thinkpad 2) to capture an image using its Primary camera, the maximum resolution that I get is 640X480. I have tried but could not succeed to get higher...

using Windows.Foundation;
using Windows.Media.Capture;
using Windows.Storage;
using Windows.Storage.AccessCache;
using Windows.Storage.Streams;
using System.Windows.Controls;
using Windows.Media;
using System.Windows.Media.Imaging;
using System;
using System.Collections.ObjectModel;
using System.Threading.Tasks;
using System.Windows;
using System.IO;
using System.Runtime.InteropServices.WindowsRuntime;



namespace Final
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : System.Windows.Window
    {
      //  MainWindow rootPage = MainWindow.; 
        //private Windows.Foundation.Collections.IPropertySet appSettings;
        //private const String photoKey = "capturedPhoto"; 
        public MainWindow()
        {
            InitializeComponent();
           // appSettings = ApplicationData.Current.LocalSettings.Values;
          //  ResetButton.Visibility = Visibility.Collapsed; 
        }

        private async void CapturePhoto_Click(object sender, System.Windows.RoutedEventArgs e)
        {

            var capture = new MediaCapture();
            // Find the camera device id to use
            string deviceId = "";
            var devices = await Windows.Devices.Enumeration.DeviceInformation.FindAllAsync(Windows.Devices.Enumeration.DeviceClass.VideoCapture);
            for (var i = 0; i < devices.Count; i++)
            {
                Console.WriteLine(devices[i]);
                deviceId = devices[i].Id;
            }

            

            var settings = new MediaCaptureInitializationSettings();
            settings.AudioDeviceId = "";
            settings.VideoDeviceId = deviceId;
            try
            {
                settings.PhotoCaptureSource = Windows.Media.Capture.PhotoCaptureSource.Auto;
                settings.StreamingCaptureMode = Windows.Media.Capture.StreamingCaptureMode.Video;
                await capture.InitializeAsync(settings);

                Windows.Media.MediaProperties.VideoEncodingProperties resolutionMax = null;
                int max = 0;
                var resolutions = capture.VideoDeviceController.GetAvailableMediaStreamProperties(MediaStreamType.Photo);
                for (var i = 0; i < resolutions.Count; i++)
                {
                    Windows.Media.MediaProperties.VideoEncodingProperties res = (Windows.Media.MediaProperties.VideoEncodingProperties)resolutions[i];
                    Console.WriteLine("resolution : " + res.Width + "x" + res.Height);
                    if (res.Width * res.Height > max)
                    {
                        max = (int)(res.Width * res.Height);
                        resolutionMax = res;
                    }
                }

                await capture.VideoDeviceController.SetMediaStreamPropertiesAsync(MediaStreamType.Photo, resolutionMax);

                Windows.Media.MediaProperties.ImageEncodingProperties imageProperties = Windows.Media.MediaProperties.ImageEncodingProperties.CreateJpeg();
                var fPhotoStream = new InMemoryRandomAccessStream();

                await capture.CapturePhotoToStreamAsync(imageProperties, fPhotoStream);
                await fPhotoStream.FlushAsync();
                fPhotoStream.Seek(0);

                byte[] bytes = new byte[fPhotoStream.Size];
                await fPhotoStream.ReadAsync(bytes.AsBuffer(), (uint)fPhotoStream.Size, InputStreamOptions.None);

                BitmapImage bitmapImage = new BitmapImage();
                MemoryStream byteStream = new MemoryStream(bytes);
                Image image = new System.Windows.Controls.Image();
                bitmapImage.BeginInit();
                bitmapImage.StreamSource = byteStream;
                bitmapImage.EndInit();
                image.Source = bitmapImage;
                CapturedPhoto.Source = bitmapImage;
                msg.Content = resolutionMax.Width;
            }
            catch (Exception ex)
            {
                msg.Content = ex.Message.ToString();
            }
      } 
        }

        
    }
}