利用tessnet2_32.dll实现OCR验证码识别代码,CSharp代码库,德仔网

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【CSharp】利用tessnet2_32.dll实现OCR验证码识别

作者:Dezai.CN / 发布于2013/5/12/ 4071


	using System;
	using System.Collections.Generic;
	using System.Web;
	//add
	using System.Net;
	using System.IO;
	using tessnet2; //引用tessnet2_32.dll
	using System.Drawing;
	using GetCodes;
	using System.Text;

	public partial class OCR : System.Web.UI.Page
	{
	 protected void Page_Load(object sender, EventArgs e)
	 {
	 WebRequest request = WebRequest.Create("http://sz.2zf.cn/js/code2.asp");
	 WebResponse response = request.GetResponse();
	 Stream st = response.GetResponseStream();
	 Bitmap bitmap = (Bitmap)Bitmap.FromStream(st);
	 UnCodebase ud = new UnCodebase(bitmap);
	 bitmap = ud.GrayByPixels();
	 ud.ClearNoise(128, 2);

	 //保存显示
	 string savepath = "~/photos/orc.gif";

	 bitmap.Save(Server.MapPath(savepath), System.Drawing.Imaging.ImageFormat.Gif);
	 Image1.ImageUrl = savepath;

	 tessnet2.Tesseract ocr = new tessnet2.Tesseract();//声明一个OCR类
	 ocr.SetVariable("tessedit_char_whitelist", "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"); //设置识别变量
	 //ocr.Init(null, "eng", false);
	 ocr.Init(Server.MapPath("~/Language"), "eng", true); //应用当前语言包。注，Tessnet2是支持多国语的。语言包下载链接：http://code.google.com/p/tesseract-ocr/downloads/list
	 List<tessnet2.Word> result = ocr.DoOCR(bitmap, Rectangle.Empty);//执行识别操作
	 string code = result[0].Text;
	 Label1.Text = code;
	 }
	}

试试其它关键字

　OCR验证码　

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