批量OCR识别内存耗尽程序自动退出

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请教版主，我在进行批量OCR识别时，内存耗尽程序自动退出，监控计算机内存到5G多，大概处理了100多张图片，请您看看我的程序有什么问题，非常感谢！！！

         try
         {
            IOcrEngine _ocrEngine;
            // 初始化OCR引擎
            _ocrEngine = OcrEngineManager.CreateEngine(OcrEngineType.Professional, false);
            // 启动OCR引擎
            _ocrEngine.Startup(null, null, null, Application.StartupPath.ToString() + "\\License\\OcrProfessionalRuntime");
            //将语言设置为中文简体
            _ocrEngine.LanguageManager.EnableLanguages(new string[] { "zh-Hans", "en" });//zh-Hans en

            DirectoryInfo directoryInfo = new DirectoryInfo(this.textBox1.Text);
            string[] myDirectory = System.IO.Directory.GetDirectories(this.textBox1.Text);
            int count = myDirectory.Length; int now = 0;

            // 加载图像
            RasterCodecs codecs = new RasterCodecs();
            codecs.ThrowExceptionsOnInvalidImages = true;
            RasterImage image;
            string mydanghao = ""; string filepath = ""; string content = "";
            DirectoryInfo folder; StreamWriter sr;
            OcrZone ocrZone = new OcrZone();
            ocrZone.ZoneType = OcrZoneType.Text;
            foreach (DirectoryInfo childDirectoryInfo in directoryInfo.GetDirectories())
            {
                  now = now + 1;
                  mydanghao = childDirectoryInfo.Name.ToString();
                  filepath = this.textBox2.Text.Trim() + "\\" + mydanghao + ".txt";
                  // 创建文件
                  content = "";
                  folder = new DirectoryInfo(this.textBox1.Text.Trim() + "\\" + mydanghao);
                  foreach (FileInfo file in folder.GetFiles("*.*"))
                  {
                     string filepath1 = this.textBox1.Text.Trim() + "\\" + mydanghao + "\\" + file.Name;
                     image = codecs.Load(filepath1);
                     using (IOcrPage ocrPage = _ocrEngine.CreatePage(image, OcrImageSharingMode.AutoDispose))
                     {
                        // Clear all the zones in the page
                        ocrPage.Zones.Clear();
                        // Add our field zone
                        //Leadtools.Forms.LogicalRectangle
                        ocrZone.Bounds = new Leadtools.Forms.LogicalRectangle(new LeadRect(0, 0, image.Width, image.Height));
                        ocrPage.Zones.Add(ocrZone);
                        // Recognize the page. This will only recognize the zone we added
                        ocrPage.Recognize(null);
                        string result = ocrPage.GetText(0).Trim();
                        if (result.Length > 0)
                        {
                              result = result.Replace("\n", "").Replace("\r", "");
                              content = content + "\r\n" + result;
                        }
                        ocrPage.Dispose();
                     }
                     image.Dispose();image = null;
                  }
                  if (File.Exists(filepath)) File.Delete(filepath);
                  sr = File.CreateText(filepath);
                  sr.WriteLine(content);//写入文本文件
                  sr.Dispose();
                  sr.Close();
            }
            MessageBox.Show("已成功完成OCR识别！\r\n应识别文件夹 " + count.ToString() + " 个，实际识别 " + now.ToString() + " 个", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
            // 关闭OCR引擎
            _ocrEngine.Shutdown();
            Process.Start(this.textBox2.Text.Trim());
         }
         catch (Exception ex)//如果出现错误则执行错误处理语句
         {
            MessageBox.Show(ex.ToString(), "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
         }