AForge.Imaging.Filters.FiltersSequence.Apply C# (CSharp) Method

        public Bitmap Apply( Bitmap image )
		{
            Bitmap dstImage = null;
            // lock source bitmap data
            BitmapData imageData = image.LockBits(
                new Rectangle( 0, 0, image.Width, image.Height ),
                ImageLockMode.ReadOnly, image.PixelFormat );

            try
            {
                // apply the filter
                dstImage = Apply( imageData );
            }
            finally
            {
                // unlock source image
                image.UnlockBits( imageData );
            }

            return dstImage;
		}

 private string reconhecerCaptcha(Image img)
 {
     Bitmap imagem = new Bitmap(img);
     imagem = imagem.Clone(new Rectangle(0, 0, img.Width, img.Height), System.Drawing.Imaging.PixelFormat.Format24bppRgb);
     Erosion erosion = new Erosion();
     Dilatation dilatation = new Dilatation();
     Invert inverter = new Invert();
     ColorFiltering cor = new ColorFiltering();
     cor.Blue = new AForge.IntRange(200, 255);
     cor.Red = new AForge.IntRange(200, 255);
     cor.Green = new AForge.IntRange(200, 255);
     Opening open = new Opening();
     BlobsFiltering bc = new BlobsFiltering();
     Closing close = new Closing();
     GaussianSharpen gs = new GaussianSharpen();
     ContrastCorrection cc = new ContrastCorrection();
     bc.MinHeight = 10;
     FiltersSequence seq = new FiltersSequence(gs, inverter, open, inverter, bc, inverter, open, cc, cor, bc, inverter);
     pictureBox.Image = seq.Apply(imagem);
     string reconhecido = OCR((Bitmap)pictureBox.Image);
     return reconhecido;
 }