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<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>
  /// 旋轉校正
  /// </summary>
  /// <param name="imageInput"></param>
  /// <returns></returns>
  private Image<Gray, Byte> randon(Image<Gray, Byte> 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<Gray, Byte> resultImage = imageInput;
   Image<Gray, Byte> ImrotaImage;
   //20度范圍內的調整
   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)
  {

  }
 }
}