驗證碼識別技術研究（1）

 1             string imgpName = @"005"; 2             Image image = Image.FromFile(@"G:\" + imgpName + @".jpg"); 3             Image img = (Image)image.Clone(); 4             Bitmap bmp = new Bitmap((Image)image.Clone()); 5             int gray = 0; 6             Graphics g = Graphics.FromImage(image); 7             int sum = 0; 8             int[] zf = new int[256];//灰階數組 9 10             #region 灰階平均值11             for (int x = 0; x < bmp.Width; x++)12             {13                 for (int y = 0; y < bmp.Height; y++)14                 {15                     //灰階演算法16                     gray = (bmp.GetPixel(x, y).R * 299 + bmp.GetPixel(x, y).G * 587 + bmp.GetPixel(x, y).B * 114 + 500) / 1000;17                     zf[gray]++;18                     sum += gray;19                 }20             }21             int avg = sum / (bmp.Width * bmp.Height);22             #endregion23 24             #region 以獲得的灰階平均值為閥值，對映像進行二值化處理25             for (int x = 0; x < bmp.Width; x++)26             {27                 for (int y = 0; y < bmp.Height; y++)28                 {29                     gray = (bmp.GetPixel(x, y).R * 299 + bmp.GetPixel(x, y).G * 587 + bmp.GetPixel(x, y).B * 114 + 500) / 1000;30                     zf[gray]++;31                     sum += gray;32                     Color color = new Color();33                     if (gray > avg)34                     {35                         color = Color.FromArgb(255, 255, 255);36                     }37                     else38                     {39                         color = Color.FromArgb(0, 0, 0);40                     }41                     g.DrawLine(new Pen(color, 1), x, y, x + 1, y + 1);42                 }43             }44             #endregion45 46             #region 長條圖繪製47             Graphics gg = Graphics.FromImage(img);48             //string k = ((int)(bmp.Height * 0.5) / zf.Max()).ToString();49             for (int i = 0; i < zf.Length; i++)50             {51                 Pen p = new Pen(Color.Red, 1);52                 gg.DrawLine(p, i, 0, i, zf[i]);53             }54             #endregion55 56             img.Save(@"G:\" + imgpName + @"長條圖.jpg");57             gg.Dispose();58             image.Save(@"G:\" + imgpName + @"二值化圖.jpg");59             image.Dispose();60             g.Dispose();61             MessageBox.Show("OK!\nGray_AVG:" + avg);//灰階平均值