C#識別驗證碼

以前看過一篇關於驗證碼識別功能的代碼，於是整理了一下。主要原理就是識別圖片的顏色不同從而轉換為文字。不過對於不規則的驗證碼就不太行了。
主要代碼如下：

recordString = string.Empty; IHTMLControlRange imgRange; IHTMLDocument2 document = new HTMLDocumentClass(); document = (IHTMLDocument2)this.axWebBrowser.Document; HTMLBody body = (HTMLBody)document.body; Bitmap bmp = new Bitmap(50, 20); foreach (IHTMLImgElement imageElement in document.images) { if (imageElement.src.IndexOf("suijitupian") > -1) { imgRange = (IHTMLControlRange)body.createControlRange(); imgRange.add((IHTMLControlElement)imageElement); imgRange.execCommand("Copy", false, null); bmp = (Bitmap)Clipboard.GetDataObject().GetData(DataFormats.Bitmap); bmp.Save(@"now.bmp"); } } this.EraseNoiseDotAndGray(bmp); this.pictureBox1.Image = bmp; bmp.Save(@"now_no_noise_dot.bmp"); //從左向右一列一列掃描，尋找四個數字的左右邊界以切割 int verticalBlackContent = 0; int width = 0; int currentNumberIndex = 0; int[,] horizonAxisArray = new int[4,2]; //左右邊界初始化 for (int i = 0; i < 4; i++) { for (int j = 0; j < 2; j++) { horizonAxisArray[i, j] = 0; } } while (currentNumberIndex <= 3 && width < 50) { for (int h = 8; h < 18; h++) { if (bmp.GetPixel(width, h).ToArgb() == Color.Black.ToArgb()) { verticalBlackContent++; } } if (horizonAxisArray[currentNumberIndex, 0] == 0 && verticalBlackContent > 0) //左邊界 { horizonAxisArray[currentNumberIndex, 0] = width; } else if (horizonAxisArray[currentNumberIndex, 0] != 0 && horizonAxisArray[currentNumberIndex, 1] == 0 && verticalBlackContent == 0) //右邊界 { horizonAxisArray[currentNumberIndex++, 1] = width - 1; } width = width + 1; verticalBlackContent = 0; } int[] tNumArr = new int[4]; //識別后的4個數字 //加載10個標准數字 Bitmap[] sNumArr = new Bitmap[10]; for (int i = 0; i < 10; i++) { sNumArr[i] = new Bitmap(@"s" + i + ".bmp"); } //分割出來的4個數字分別與等寬的標准數字相匹配 for (int i = 0; i < 4; i++) { int maxMatch = 0; Bitmap cutNum = bmp.Clone(new Rectangle(horizonAxisArray[i, 0], 8, horizonAxisArray[i, 1] - horizonAxisArray[i, 0] + 1, 10), PixelFormat.Format24bppRgb); for (int s = 0; s < 10; s++) { if (cutNum.Width == sNumArr[s].Width) //等寬則匹配 { int curMatch = 0; for (int j = 0; j < cutNum.Width; j++) { for (int k = 0; k < 10; k++) { if (cutNum.GetPixel(j, k).ToArgb() == sNumArr[s].GetPixel(j, k).ToArgb() && cutNum.GetPixel(j, k).ToArgb() == Color.Black.ToArgb() && sNumArr[s].GetPixel(j, k).ToArgb() == Color.Black.ToArgb()) { curMatch++; } } } if (curMatch > maxMatch) { maxMatch = curMatch; tNumArr[i] = s; } } } recordString += tNumArr[i] + ""; } this.richTextBox1.Text = recordString;

 

private void EraseNoiseDotAndGray(Bitmap bmp) { for (int w = 0; w < 50; w++) { for (int h = 0; h < 20; h++) { if (bmp.GetPixel(w, h).R == 204) //為雜點，變為白色 { bmp.SetPixel(w, h, Color.White); } else if (bmp.GetPixel(w, h).G != 255) //為數字所在點，變為黑色 { bmp.SetPixel(w, h, Color.Black); } } } }

 這里用了AxWebBrowser控件，結果老是加不到工具欄中去，所以只好手動寫了個初始化，然后加到Desinge里。

private AxWebBrowser axWebBrowser = null; private void InitialAxWebBrowser() { System.ComponentModel.ComponentResourceManager resources = new System.ComponentModel.ComponentResourceManager(typeof(VCCMainForm)); this.axWebBrowser = new AxSHDocVw.AxWebBrowser(); ((System.ComponentModel.ISupportInitialize)(this.axWebBrowser)).BeginInit(); this.axWebBrowser.Dock = System.Windows.Forms.DockStyle.Bottom; this.axWebBrowser.Enabled = true; this.axWebBrowser.Location = new System.Drawing.Point(0, 225); this.axWebBrowser.OcxState = ((System.Windows.Forms.AxHost.State)(resources.GetObject("axWebBrowser.OcxState"))); this.axWebBrowser.Size = new System.Drawing.Size(592, 212); this.axWebBrowser.TabIndex = 0; this.axWebBrowser.ProgressChange += new DWebBrowserEvents2_ProgressChangeEventHandler(axWebBrowser_ProgressChange); this.axWebBrowser.StatusTextChange += new DWebBrowserEvents2_StatusTextChangeEventHandler(axWebBrowser_StatusTextChange); this.axWebBrowser.DocumentComplete += new DWebBrowserEvents2_DocumentCompleteEventHandler(axWebBrowser_DocumentComplete); this.Controls.Add(this.axWebBrowser); }

結果如下：

 
 詳細工程：http://download.csdn.net/detail/yysyangyangyangshan/4233915