基于C#技术实现身份证识别功能

/// 

/// 上传图片
/// 
/// 
public static string CardUpload()
{
try
{
string appkey = "网站自己申请的key"; //配置您申请的appkey 
HttpPostedFile file = HttpContext.Current.Request.Files[0];
string url = "http://api2.juheapi.com/cardrecon/upload";
var parameters = new Dictionary();
parameters.Add("key", appkey);
parameters.Add("cardType", "2");
string result = HttpPostData(url, 60000, "pic", file.InputStream, parameters);
JObject info = JObject.Parse(JObject.Parse(result)["result"].ToString());
var cardInfo = new
{
name = info["姓名"],
card = info["公民身份号码"]
};
return cardInfo.ToJson();
}
catch (Exception ex)
{
return ex.ToString();
}
}
/// 

/// Post调用API
/// 
/// api地址
/// 访问超时时间
/// 文件参数名
/// 文件流
/// 参数列表
/// 结果集
private static string HttpPostData(string url, int timeOut, string fileKeyName,
Stream file, Dictionary stringDict)
{
string responseContent;
var memStream = new MemoryStream();
var webRequest = (HttpWebRequest)WebRequest.Create(url);
// 边界符
var boundary = "---------------" + DateTime.Now.Ticks.ToString("x");
// 边界符
var beginBoundary = Encoding.ASCII.GetBytes("--" + boundary + "\r\n");
// 最后的结束符
var endBoundary = Encoding.ASCII.GetBytes("--" + boundary + "--\r\n");
// 设置属性
webRequest.Method = "POST";
webRequest.Timeout = timeOut;
webRequest.ContentType = "multipart/form-data; boundary=" + boundary;
//写入开始边界符
memStream.Write(beginBoundary, 0, beginBoundary.Length);
// 写入文件
const string filePartHeader =
"Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\n" +
"Content-Type: application/octet-stream\r\n\r\n";
var header = string.Format(filePartHeader, fileKeyName, "card.jpg");
var headerbytes = Encoding.UTF8.GetBytes(header);
memStream.Write(headerbytes, 0, headerbytes.Length);
file.CopyTo(memStream);
// 写入字符串的Key
var stringKeyHeader = "\r\n--" + boundary +
"\r\nContent-Disposition: form-data; name=\"{0}\"" +
"\r\n\r\n{1}\r\n";
foreach (byte[] formitembytes in from string key in stringDict.Keys
select string.Format(stringKeyHeader, key, stringDict[key])
into formitem
select Encoding.UTF8.GetBytes(formitem))
{
memStream.Write(formitembytes, 0, formitembytes.Length);
}
// 写入最后的结束边界符
memStream.Write(endBoundary, 0, endBoundary.Length);
webRequest.ContentLength = memStream.Length;
// 构造完毕，执行POST方法
var requestStream = webRequest.GetRequestStream();
memStream.Position = 0;
var tempBuffer = new byte[memStream.Length];
memStream.Read(tempBuffer, 0, tempBuffer.Length);
memStream.Close();
requestStream.Write(tempBuffer, 0, tempBuffer.Length);
requestStream.Close();
var httpWebResponse = (HttpWebResponse)webRequest.GetResponse();
using (var httpStreamReader = new StreamReader(httpWebResponse.GetResponseStream(),
Encoding.GetEncoding("utf-8")))
{
responseContent = httpStreamReader.ReadToEnd();
}
httpWebResponse.Close();
webRequest.Abort();
return responseContent;
}

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using Emgu.CV;
using Emgu.CV.OCR;
using Emgu.CV.Structure;
using System.IO;
namespace ImageManage
{
public partial class Form1 : Form
{
Image imageThreshold;
public Form1()
{
InitializeComponent();
}
private void btn_convert_Click(object sender, EventArgs e)
{
//第一个参数是语言包文件夹的地址，不写默认在执行文件夹下
Tesseract _ocr = new Tesseract("", "chi_sim", OcrEngineMode.TesseractOnly);
_ocr.Recognize(imageThreshold);
String text = _ocr.GetText();
this.textBox1.Text = text;
}
private void pictureBox1_Click(object sender, EventArgs e)
{
OpenFileDialog of = new OpenFileDialog();
of.Title = "请选择图片";
if (of.ShowDialog() == DialogResult.OK)
{
string file = of.FileName;
Image img = Image.FromFile(file);
pictureBox1.Image = img; 
}
Bitmap bitmap = (Bitmap)this.pictureBox1.Image;
Image imageSource = new Image(bitmap);
Image imageGrayscale = imageSource.Convert();
imageGrayscale = randon(imageGrayscale);
imageThreshold = imageGrayscale.ThresholdBinary(new Gray(100), new Gray(255));
this.pictureBox2.Image = imageThreshold.ToBitmap();
}
/// 

/// 旋转校正
/// 
/// 
/// 
private Image randon(Image imageInput)//图像投影旋转法倾斜校正子函数定义
{
int nwidth = imageInput.Width;
int nheight = imageInput.Height;
int sum;
int SumOfCha;
int SumOfChatemp = 0;
int[] sumhang = new int[nheight];
Image resultImage = imageInput;
Image ImrotaImage;
//20度范围内的调整
for (int ang = -20; ang < 20; ang = ang + 1)
{
ImrotaImage = imageInput.Rotate(ang, new Gray(1));
for (int i = 0; i < nheight; i++)
{
sum = 0;
for (int j = 0; j < nwidth; j++)
{
sum += ImrotaImage.Data[i, j, 0];
}
sumhang[i] = sum;
}
SumOfCha = 0;
for (int k = 0; k < nheight - 1; k++)
{
SumOfCha = SumOfCha + (Math.Abs(sumhang[k] - sumhang[k + 1]));
}
if (SumOfCha > SumOfChatemp)
{
resultImage = ImrotaImage;
SumOfChatemp = SumOfCha;
}
}
return resultImage;
}
}
}

StringBuilder sb = new StringBuilder();
MODI.Document doc = new MODI.Document();
doc.Create(fullFileName);
MODI.Image image;
MODI.Layout layout;
doc.OCR(MODI.MiLANGUAGES.miLANG_CHINESE_SIMPLIFIED, true, true); // 识别文字类型
for (int i = 0; i < doc.Images.Count; i++)
{
image = (MODI.Image)doc.Images[i];
layout = image.Layout;
sb.Append(layout.Text);
}