C#

private void btnDecode_Click_1(object sender, EventArgs e)
        {
            try
            {
                

                DeviceManager manager = new DeviceManagerClass();
                Device d = null;
                foreach (DeviceInfo info in manager.DeviceInfos)
                {
                    d = info.Connect();
                    
                }

                Item item = d.ExecuteCommand(CommandID.wiaCommandTakePicture);

                foreach (string format in item.Formats)
                {

                    WIA.ImageFile imagefile = item.Transfer(format) as WIA.ImageFile;
                   // if (File.Exists("d:\\test.jpg"))
                    {
                       // picDecode.Image = null;
                       // File.Delete("d:\\test.jpg");
                    }
                   imagefile.SaveFile("d:\\4.jpg");
                    Bitmap image = new Bitmap("d:\\4.jpg");
                    Bitmap bm = new Bitmap(image, 200, 150);

                    System.Drawing.Bitmap TempBitmap = bm;
                    float brightness = 0.6f;
                    float constrast = 6f;
                    System.Drawing.Bitmap NewBitmap = new System.Drawing.Bitmap(TempBitmap.Width, TempBitmap.Height);
                    System.Drawing.Graphics NewGraphics = System.Drawing.Graphics.FromImage(NewBitmap);
                    float[][] FloatColorMatrix ={
                    new float[] {constrast, 0, 0, 0, 0},
                    new float[] {0, constrast, 0, 0, 0},
                    new float[] {0, 0, constrast, 0, 0},
                    new float[] {0, 0, 0, constrast, 0},
                    new float[] {brightness, brightness, brightness, 1, 1}
                };

                    System.Drawing.Imaging.ColorMatrix NewColorMatrix = new System.Drawing.Imaging.ColorMatrix(FloatColorMatrix);
                    System.Drawing.Imaging.ImageAttributes Attributes = new System.Drawing.Imaging.ImageAttributes();
                    Attributes.SetColorMatrix(NewColorMatrix);
                    NewGraphics.DrawImage(TempBitmap, new System.Drawing.Rectangle(0, 0, TempBitmap.Width, TempBitmap.Height), 0, 0, TempBitmap.Width, TempBitmap.Height, System.Drawing.GraphicsUnit.Pixel, Attributes);
                    Attributes.Dispose();
                    NewGraphics.Dispose();

                    picDecode.Image = NewBitmap;
                    break;
          
                }

                QRCodeDecoder decoder = new QRCodeDecoder();
                String decodedString = decoder.decode(new QRCodeBitmapImage(new Bitmap(picDecode.Image)));
                txtDecodedData.Text = decodedString;
               
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }