Ejemplo n.º 1
0
        public static CIFARImageBW FromCIFARImage(CIFARImage orig)
        {
            CIFARImageBW result = new CIFARImageBW(orig.Label, orig.Width, orig.Height);
            for (int i = 0; i < result.PixelData.Length; ++i)
            {
                result.PixelData[i] = (orig.PixelData[i] + orig.PixelData[i + 1024] + orig.PixelData[i + 2048]) / 3.0;
            }

            return result;
        }
Ejemplo n.º 2
0
        public static CIFARImageBW FromCIFARImage(CIFARImage orig, int channel)
        {
            if (channel < 0 || channel > 2)
                throw new Exception("Channel != 1, 2, or 3");

            CIFARImageBW result = new CIFARImageBW(orig.Label, orig.Width, orig.Height );
            for (int i = 0; i < result.PixelData.Length; ++i)
            {
                result.PixelData[i] = (orig.PixelData[i + 1024 * channel]);
            }
            return result;
        }
Ejemplo n.º 3
0
Archivo: IO.cs Proyecto: KBrus/nton-rbm
        public static void SavePicture(CIFARImageBW image, string path, bool isCentered)
        {
            Bitmap bm = new Bitmap(image.Width, image.Height);
            for (int i = 0; i < image.Height; ++i)
            {
                for (int j = 0; j < image.Width; ++j)
                {
                    int val = isCentered ? DoubleTo8bppGray(image.PixelData[i*image.Width+j]) : (byte) image.PixelData[i*image.Width+j];
                    bm.SetPixel(j, i, Color.FromArgb(val, val, val));
                }
            }

            bm.Save(path, System.Drawing.Imaging.ImageFormat.Png);
        }
Ejemplo n.º 4
0
 public static CIFARImageBW GetPatch(CIFARImageBW img, int x, int y)
 {
     CIFARImageBW result = new CIFARImageBW(img.Label, 8, 8);
     for (int j = 0; j < 8; ++j)
     {
         for (int i = 0; i < 8; ++i)
         {
             result.PixelData[j * 8 + i] = img.PixelData[(y + j) * 32 + x + i];
         }
     }
     return result;
 }
Ejemplo n.º 5
0
        public static double[,] ToDoubleMtx(CIFARImageBW image)
        {
            int sqrtDim = (int) Math.Sqrt(image.PixelData.Length);

            double[,] result = new double[sqrtDim, sqrtDim];

            for (int i = 0; i < sqrtDim; ++i)
                for (int j = 0; j < sqrtDim; ++j)
                    result[i, j] = image.PixelData[j * sqrtDim + i];

            return result;
        }
Ejemplo n.º 6
0
        public static CIFARImageBW Normalize_ZeroMean(CIFARImageBW orig)
        {
            CIFARImageBW result = new CIFARImageBW(orig.Label, orig.Width, orig.Height);

            double mean = Mean(orig);

            for (int i = 0; i < result.PixelData.Length; ++i)
            {
                result.PixelData[i] = orig.PixelData[i] - mean;
            }

            return result;
        }
Ejemplo n.º 7
0
        public static double[,] Normalize_Whiten(CIFARImageBW image)
        {
            image = Normalize_ZeroMean(image);

            var img_mtx = ToDoubleMtx(image);
            var cov_mtx = Cov_Mtx(img_mtx);

            double[] w = new double[cov_mtx.GetLength(1)];
            double[,] u = new double[cov_mtx.GetLength(0), cov_mtx.GetLength(1)];
            double[,] vt = new double[cov_mtx.GetLength(0), cov_mtx.GetLength(1)];

            alglib.svd.rmatrixsvd(cov_mtx, cov_mtx.GetLength(0), cov_mtx.GetLength(1), 2, 2, 2, ref w, ref u, ref vt);

            double[,] _1_sqrt_w_mtx = new double[w.Length, w.Length];
            for (int i = 0; i < w.Length; ++i)
            {
                _1_sqrt_w_mtx[i, i] = 1 / Math.Sqrt(w[i] + 0.00000001);
            }

            double[,] ut = new double[w.Length, w.Length];
            alglib.rmatrixtranspose(w.Length, w.Length, u, 0, 0, ref ut, 0, 0);

            double[,] result1 = new double[w.Length, w.Length];
            double[,] result2 = new double[w.Length, w.Length];
            double[,] result3 = new double[w.Length, w.Length];

            alglib.rmatrixgemm(w.Length, w.Length, w.Length, 1, u, 0, 0, 0, _1_sqrt_w_mtx, 0, 0, 0, 0, ref result1, 0, 0);
            alglib.rmatrixgemm(w.Length, w.Length, w.Length, 1, result1, 0, 0, 0, ut, 0, 0, 0, 0, ref result2, 0, 0);
            alglib.rmatrixgemm(w.Length, w.Length, w.Length, 1, result2, 0, 0, 0, img_mtx, 0, 0, 0, 0, ref result3, 0, 0);

            return NormalizeMtx(result3);
        }
Ejemplo n.º 8
0
 public static double Mean(CIFARImageBW img)
 {
     double mean = 0;
     foreach (var PixelVal in img.PixelData)
     {
         mean += PixelVal;
     }
     return mean / img.PixelData.Length;
 }
Ejemplo n.º 9
0
 public static List<CIFARImageBW> GetPatches_Seq(CIFARImageBW img)
 {
     List<CIFARImageBW> result = new List<CIFARImageBW>();
     for (int i = 0; i < 24; i += 1)
     {
         for (int j = 0; j < 24; j += 1)
         {
             //Console.WriteLine("{0}:{1}", i, j);
             result.Add(GetPatch(img, j, i));
         }
     }
     return result;
 }
Ejemplo n.º 10
0
        public static List<CIFARImageBW> GetPatches_25(CIFARImageBW img)
        {
            List<CIFARImageBW> result = new List<CIFARImageBW>();
            for (int i = 0; i < 4; ++i)
                for (int j = 0; j < 4; ++j)
                    result.Add(GetPatch(img, j * 8, i * 8));

            for (int i = 0; i < 3; ++i)
                for (int j = 0; j < 3; ++j)
                    result.Add(GetPatch(img, j * 8 + 4, i * 8 + 4));

            return result;
        }