C# OpenCvSharp DNN 极简主义OCR

C# OpenCvSharp DNN 极简主义OCR

目录

说明

效果

项目

代码

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说明

本OCR程序中，文本检测使用EAST，文本识别使用CRNN。 这两个网络的推理仅依靠opencv的dnn模块实现（理论上说，X86可用，Win7可用！）。

识别内容：0123456789abcdefghijklmnopqrstuvwxyz，不支持中文识别！

参考：https://github.com/hpc203/ocr-opencv-dnn

EAST模型下载链接：https://www.dropbox.com/s/r2ingd0l3zt8hxs/frozen_east_text_detection.tar.gz?dl=1
CRNN模型下载链接：https://drive.google.com/drive/folders/1cTbQ3nuZG-EKWak6emD_s8_hHXWz7lAr

效果

项目

代码

using OpenCvSharp;
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Windows.Forms;

namespace 极简主义OCR
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        OCR ocr;
        List ltOcrResult;

        private string fileFilter = "*.*|*.bmp;*.jpg;*.jpeg;*.tiff;*.tiff;*.png";

        DateTime dt1 = DateTime.Now;
        DateTime dt2 = DateTime.Now;

        String imgPath;
        Mat mat;
        Mat resultImg;

        private void Form1_Load(object sender, EventArgs e)
        {
            ocr = new OCR("model/CRNN_VGG_BiLSTM_CTC.onnx", "model/frozen_east_text_detection.pb", "0123456789abcdefghijklmnopqrstuvwxyz");
        }

        private void btnSelect_Click(object sender, EventArgs e)
        {
            try
            {
                OpenFileDialog ofd = new OpenFileDialog();
                ofd.Filter = fileFilter;
                if (ofd.ShowDialog() != DialogResult.OK) return;

                imgPath = ofd.FileName;
                pictureBox1.Image = new Bitmap(imgPath, true); ;

                richTextBox1.Clear();
                btnSelect.Enabled = false;
                button1.Enabled = false;
                System.Windows.Forms.Application.DoEvents();

                mat = new Mat(ofd.FileName);
                resultImg = mat.Clone();

                dt1 = DateTime.Now;
                ltOcrResult = ocr.detect_rec(mat);
                dt2 = DateTime.Now;

                ShowOCRResult(ltOcrResult);

                btnSelect.Enabled = true;
                button1.Enabled = true;
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
            try
            {
                if (imgPath == null)
                {
                    return;
                }

                richTextBox1.Clear();
                btnSelect.Enabled = false;
                button1.Enabled = false;
                if (pictureBox1.Image!=null)
                {
                    pictureBox1.Image.Dispose();
                }
                pictureBox1.Image = new Bitmap(mat.ToMemoryStream());
                System.Windows.Forms.Application.DoEvents();

                resultImg.Dispose();
                resultImg = mat.Clone();
                dt1 = DateTime.Now;
                ltOcrResult = ocr.detect_rec(mat);
                dt2 = DateTime.Now;
                ShowOCRResult(ltOcrResult);

                btnSelect.Enabled = true;
                button1.Enabled = true;
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }

        }

        ///


        /// 显示结果
        ///
        private void ShowOCRResult(List ocrResult)
        {
            richTextBox1.Clear();
            richTextBox1.AppendText("耗时:" + (dt2 - dt1).TotalMilliseconds + "ms\n");
            richTextBox1.AppendText("-----------------------------------\n");

            foreach (var item in ocrResult)
            {
                richTextBox1.AppendText(item.text + "\n");
                for (int j = 0; j < 4; ++j)
                {
                    Cv2.Line(resultImg, (OpenCvSharp.Point)item.vertices[j], (OpenCvSharp.Point)item.vertices[(j + 1) % 4], new Scalar(0, 255, 0), 1,LineTypes.AntiAlias);
                }

            }
            if (pictureBox1.Image!=null)
            {
                pictureBox1.Image.Dispose();
            }
            pictureBox1.Image = new Bitmap(resultImg.ToMemoryStream());
        }

    }
}

  1. using OpenCvSharp;
  2. using System;
  3. using System.Collections.Generic;
  4. using System.Drawing;
  5. using System.Windows.Forms;
  6.  
  7. namespace 极简主义OCR
  8. {
  9.     public partial class Form1 : Form
  10.     {
  11.         public Form1()
  12.         {
  13.             InitializeComponent();
  14.         }
  15.  
  16.         OCR ocr;
  17.         List<OcrResult> ltOcrResult;
  18.  
  19.         private string fileFilter = "*.*|*.bmp;*.jpg;*.jpeg;*.tiff;*.tiff;*.png";
  20.  
  21.         DateTime dt1 = DateTime.Now;
  22.         DateTime dt2 = DateTime.Now;
  23.  
  24.         String imgPath;
  25.         Mat mat;
  26.         Mat resultImg;
  27.  
  28.         private void Form1_Load(object sender, EventArgs e)
  29.         {
  30.             ocr = new OCR("model/CRNN_VGG_BiLSTM_CTC.onnx", "model/frozen_east_text_detection.pb", "0123456789abcdefghijklmnopqrstuvwxyz");
  31.         }
  32.  
  33.         private void btnSelect_Click(object sender, EventArgs e)
  34.         {
  35.             try
  36.             {
  37.                 OpenFileDialog ofd = new OpenFileDialog();
  38.                 ofd.Filter = fileFilter;
  39.                 if (ofd.ShowDialog() != DialogResult.OK) return;
  40.  
  41.                 imgPath = ofd.FileName;
  42.                 pictureBox1.Image = new Bitmap(imgPath, true); ;
  43.  
  44.                 richTextBox1.Clear();
  45.                 btnSelect.Enabled = false;
  46.                 button1.Enabled = false;
  47.                 System.Windows.Forms.Application.DoEvents();
  48.  
  49.                 mat = new Mat(ofd.FileName);
  50.                 resultImg = mat.Clone();
  51.  
  52.                 dt1 = DateTime.Now;
  53.                 ltOcrResult = ocr.detect_rec(mat);
  54.                 dt2 = DateTime.Now;
  55.  
  56.                 ShowOCRResult(ltOcrResult);
  57.  
  58.                 btnSelect.Enabled = true;
  59.                 button1.Enabled = true;
  60.             }
  61.             catch (Exception ex)
  62.             {
  63.                 MessageBox.Show(ex.Message);
  64.             }
  65.         }
  66.  
  67.         private void button1_Click(object sender, EventArgs e)
  68.         {
  69.             try
  70.             {
  71.                 if (imgPath == null)
  72.                 {
  73.                     return;
  74.                 }
  75.  
  76.                 richTextBox1.Clear();
  77.                 btnSelect.Enabled = false;
  78.                 button1.Enabled = false;
  79.                 if (pictureBox1.Image!=null)
  80.                 {
  81.                     pictureBox1.Image.Dispose();
  82.                 }
  83.                 pictureBox1.Image = new Bitmap(mat.ToMemoryStream());
  84.                 System.Windows.Forms.Application.DoEvents();
  85.  
  86.                 resultImg.Dispose();
  87.                 resultImg = mat.Clone();
  88.                 dt1 = DateTime.Now;
  89.                 ltOcrResult = ocr.detect_rec(mat);
  90.                 dt2 = DateTime.Now;
  91.                 ShowOCRResult(ltOcrResult);
  92.  
  93.                 btnSelect.Enabled = true;
  94.                 button1.Enabled = true;
  95.             }
  96.             catch (Exception ex)
  97.             {
  98.                 MessageBox.Show(ex.Message);
  99.             }
  100.  
  101.         }
  102.  
  103.         /// <summary>
  104.         /// 显示结果
  105.         /// </summary>
  106.         private void ShowOCRResult(List<OcrResult> ocrResult)
  107.         {
  108.             richTextBox1.Clear();
  109.             richTextBox1.AppendText("耗时:" + (dt2 - dt1).TotalMilliseconds + "ms\n");
  110.             richTextBox1.AppendText("-----------------------------------\n");
  111.  
  112.             foreach (var item in ocrResult)
  113.             {
  114.                 richTextBox1.AppendText(item.text + "\n");
  115.                 for (int j = 0; j < 4; ++j)
  116.                 {
  117.                     Cv2.Line(resultImg, (OpenCvSharp.Point)item.vertices[j], (OpenCvSharp.Point)item.vertices[(j + 1) % 4], new Scalar(0, 255, 0), 1,LineTypes.AntiAlias);
  118.                 }
  119.  
  120.             }
  121.             if (pictureBox1.Image!=null)
  122.             {
  123.                 pictureBox1.Image.Dispose();
  124.             }
  125.             pictureBox1.Image = new Bitmap(resultImg.ToMemoryStream());
  126.         }
  127.  
  128.     }
  129. }

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