C身份證識別相關技術

最近研究C#相關的OCR技術，圖像識別一般C和C++這種底層語言做的比較多，C#主要是依託一些封裝好的組件進行調用，這裡介紹一種身份證識別的方法。

在File類別下下載這個EXE，進行安裝，安裝後在目錄下能找相應組件，還有些應用的案例。

dll文件夾中的dll引用到C#項目中，x64，x86，tessdata對應OCR識別的類庫和語言庫，我tessdata中已添加中文語言包，將這三個文件夾放入程序執行文件夾中。

自己做的小Demo如圖：身份證圖片是百度上下載的

不得不說這個類庫唯一弊端就是文字識別率太低，圖像識別效果也不太好

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 imageThreshold;
public Form1
{
InitializeComponent;
pictureBox1.Enabled = false;
}

private void Form1_Load(object sender, EventArgs e)
{

}

private void button1_Click(object sender, EventArgs e)
{
//第一個參數是語言包文件夾的地址，不寫默認在執行文件夾下
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 = "請選擇圖片";
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;
}
///

/// ///
private Image randon(Image imageInput)//圖像投影旋轉法傾斜校正子函數定義
{
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度範圍內的調整
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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