OpenCVSharp文字区域识别

基于OpenCVsharp的C#程序用于提取文字区域

using OpenCvSharp;
using OpenCvSharp.Extensions;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace OpenCVSharpDemo
{
    public partial class Form1 : Form
    {
        public Form1（）
        {
            InitializeComponent（）;
        }

        string fileName;
        Mat mat;

        private void Form1_Load（object sender EventArgs e）
        {
            fileName = @Application.StartupPath + @“\test.png“;
            mat = new Mat（fileName）;
            pictureBox1.SizeMode = PictureBoxSizeMode.Zoom;
            pictureBox1.Image = mat.ToBitmap（）;
        }

        public void findTextRegion（Mat dilation）
        {
            // 1. 查找轮廓
            OpenCvSharp.Point[][] contours;
            HierarchyIndex[] hierarchly;
            Rect biggestContourRect = new Rect（）;

            Cv2.FindContours（dilation out contours out hierarchly RetrievalModes.Tree ContourApproximationModes.ApproxSimple）;

            // 2. 筛选那些面积小的
            int i = 0;
            foreach （OpenCvSharp.Point[] contour in contours）
            {
                double area = Cv2.ContourArea（contour）;

                //面积小的都筛选掉
                if （area < 1000）
                {
                    continue;
                }

                //轮廓近似，作用很小
                double epsilon = 0.001 * Cv2.ArcLength（contour true）;

                //找到最小的矩形
                biggestContourRect = Cv2.BoundingRect（contour）;

                if （biggestContourRect.Height > （biggestContourRect.Width * 1.2））
                {
                    continue;
                }

                //画线
                mat.Rectangle（biggestContourRectnew Scalar（0 255 0） 2）;
            }

            pictureBox1.Image = mat.ToBitmap（）;
            //Cv2.ImShow（“img“ mat）;
        }


        public Mat preprocess（string imgPath）
        {
            Mat dilation2 = new Mat（）;

            //读取灰度图
            using （Mat src = new Mat（imgPath ImreadModes.Grayscale））
            {
                //1.Sobel算子，x方向求梯度
                Mat sobel = new Mat（）;
                Cv2.Sobel（src sobel MatType.CV_8U 1 0 3）;

                //2.二值化
                Mat binary = new Mat（）;
                Cv2.Threshold（sobel binary 0 255 ThresholdTypes.Otsu | ThresholdTypes.Binary）;

                //3. 膨胀和腐蚀操作的核函数
                Mat element1 = new Mat（）;
                Mat element2 = new Mat（）;
                OpenCvSharp.Size size1 = new OpenCvSharp.Size（30 9）;
                OpenCvSharp.Size size2 = new OpenCvSharp.Size（24 6）;

                element1 = Cv2.GetStructuringElement（MorphShapes.Rect size1）;
                element2 = Cv2.GetStructuringElement（MorphShapes.Rect size2）;

                //4. 膨胀一次，让轮廓突出
                Mat dilation = new Mat（）;
                Cv2.Dilate（binary dilation element2）;

     

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2020-04-26 06:48  OpenCVSharpDemo-master\
     文件          10  2020-04-26 06:48  OpenCVSharpDemo-master\.gitignore
     目录           0  2020-04-26 06:48  OpenCVSharpDemo-master\.vs\
     目录           0  2020-04-26 06:48  OpenCVSharpDemo-master\.vs\OpenCVSharpDemo\
     目录           0  2020-04-26 06:48  OpenCVSharpDemo-master\.vs\OpenCVSharpDemo\v16\
     文件       90112  2020-04-26 06:48  OpenCVSharpDemo-master\.vs\OpenCVSharpDemo\v16\.suo
     目录           0  2020-04-26 06:48  OpenCVSharpDemo-master\.vs\OpenCVSharpDemo\v16\Server\
     目录           0  2020-04-26 06:48  OpenCVSharpDemo-master\.vs\OpenCVSharpDemo\v16\Server\sqlite3\
     文件           0  2020-04-26 06:48  OpenCVSharpDemo-master\.vs\OpenCVSharpDemo\v16\Server\sqlite3\db.lock
     文件      622592  2020-04-26 06:48  OpenCVSharpDemo-master\.vs\OpenCVSharpDemo\v16\Server\sqlite3\storage.ide
     文件       32768  2020-04-26 06:48  OpenCVSharpDemo-master\.vs\OpenCVSharpDemo\v16\Server\sqlite3\storage.ide-shm
     文件      197792  2020-04-26 06:48  OpenCVSharpDemo-master\.vs\OpenCVSharpDemo\v16\Server\sqlite3\storage.ide-wal
     文件        1126  2020-04-26 06:48  OpenCVSharpDemo-master\OpenCVSharpDemo.sln
     目录           0  2020-04-26 06:48  OpenCVSharpDemo-master\OpenCVSharpDemo\
     文件          10  2020-04-26 06:48  OpenCVSharpDemo-master\OpenCVSharpDemo\.gitignore
     文件        3324  2020-04-26 06:48  OpenCVSharpDemo-master\OpenCVSharpDemo\Form1.Designer.cs
     文件        3702  2020-04-26 06:48  OpenCVSharpDemo-master\OpenCVSharpDemo\Form1.cs
     文件        5698  2020-04-26 06:48  OpenCVSharpDemo-master\OpenCVSharpDemo\Form1.resx
     文件        5421  2020-04-26 06:48  OpenCVSharpDemo-master\OpenCVSharpDemo\OpenCVSharpDemo.csproj
     文件         475  2020-04-26 06:48  OpenCVSharpDemo-master\OpenCVSharpDemo\Program.cs
     目录           0  2020-04-26 06:48  OpenCVSharpDemo-master\OpenCVSharpDemo\Properties\
     文件        1286  2020-04-26 06:48  OpenCVSharpDemo-master\OpenCVSharpDemo\Properties\AssemblyInfo.cs
     文件        2772  2020-04-26 06:48  OpenCVSharpDemo-master\OpenCVSharpDemo\Properties\Resources.Designer.cs
     文件        5496  2020-04-26 06:48  OpenCVSharpDemo-master\OpenCVSharpDemo\Properties\Resources.resx
     文件        1072  2020-04-26 06:48  OpenCVSharpDemo-master\OpenCVSharpDemo\Properties\Settings.Designer.cs
     文件         242  2020-04-26 06:48  OpenCVSharpDemo-master\OpenCVSharpDemo\Properties\Settings.settings
     文件         152  2020-04-26 06:48  OpenCVSharpDemo-master\OpenCVSharpDemo\packages.config
     文件       79127  2020-04-26 06:48  OpenCVSharpDemo-master\OpenCVSharpDemo\test.png
     文件          71  2020-04-26 06:48  OpenCVSharpDemo-master\README.md