C#实现身份证识别功能的图文代码详解

这篇文章主要介绍了C#身份证识别相关技术详解,具有一定的参考价值，感兴趣的小伙伴们可以参考一下

最近研究C#相关的OCR技术，图像识别一般C和C++这种底层语言做的比较多，C#主要是依托一些封装好的组件进行调用，这里介绍一种身份证识别的方法。

环境搭建

下载地址：EmguCV官网

在File类别下下载这个EXE，进行安装，安装后在目录下能找相应组件，还有些应用的案例。

dll文件夹中的dll引用到C#项目中，x64，x86，tessdata对应OCR识别的类库和语言库，我tessdata中已添加中文语言包，将这三个文件夹放入程序执行文件夹中。

Demo

自己做的小Demo如图：身份证图片是百度上下载的

不得不说这个类库唯一弊端就是文字识别率太低，图像识别效果也不太好

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows.Forms;using Emgu.CV;using Emgu.CV.OCR;using Emgu.CV.Structure;using System.IO;namespace EmguCV{ public partial class Form1 : Form {  Image<Gray, Byte> imageThreshold;  public Form1()  {   InitializeComponent();   pictureBox1.Enabled = false;  }  private void Form1_Load(object sender, EventArgs e)  {  }  private void button1_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.SetImage(imageThreshold);   _ocr.Recognize();   String text = _ocr.GetUTF8Text();   this.textBox1.Text = text;  }  private void pictureBox2_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<Bgr, Byte> imageSource = new Image<Bgr, byte>(bitmap);   Image<Gray, Byte> imageGrayscale = imageSource.Convert<Gray, Byte>();   imageGrayscale = randon(imageGrayscale);   imageThreshold = imageGrayscale.ThresholdBinary(new Gray(100), new Gray(255));   this.pictureBox2.Image = imageThreshold.ToBitmap();  }  /// <summary>  /// 旋转校正  /// </summary>  /// <param name="imageInput"></param>  /// <returns></returns>  private Image<Gray, Byte> randon(Image<Gray, Byte> 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<Gray, Byte> resultImage = imageInput;   Image<Gray, Byte> 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;  }  private void pictureBox1_Click(object sender, EventArgs e)  {  } }}

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