ocr识别彩色图片提示内存不足

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      private Dictionary<string, string> OcrRecognizes()
      {
         try
         {
            //识别的结果放在dic里，key是文件名，value是识别的结果
            Dictionary<string, string> dic = new Dictionary<string, string>();
            //初始化
            IOcrEngine ocrEngine = OcrEngineManager.CreateEngine(OcrEngineType.Advantage, false);
            //这里的ocradvantagerruntime路径需要改为设置的路径
            ocrEngine.Startup(null, null, null, _ocrAdvantageRuntimePath);

            ocrEngine.LanguageManager.EnableLanguages(new string[] { "zh-Hans", "en" });
            //提取自定义识别区域
            string ocrsetfilename = Path.Combine(System.Windows.Forms.Application.StartupPath, "ocrSetup.xml");
            if(!File.Exists(ocrsetfilename))
            {
                  MessageBox.Show("您没有设置ocr选区！");
                  return dic;
            }
            OcrSetRWXML ocrsetrwXml = new OcrSetRWXML(ocrsetfilename);
            Dictionary<string, object> ocrDic = ocrsetrwXml.reader();
            if (ocrDic.Count <= 0)
                  return dic;
            string zonefilename = (string)ocrDic["ZoneFileName"];
            if (zonefilename.Equals(string.Empty))
                  return dic;
            if (!File.Exists(zonefilename))
                  return dic;
            using (WaitCursor waitCursor = new WaitCursor())
            {
                  if (Directory.Exists(_tempFilePath))
                  {
                     DirectoryInfo dir = new DirectoryInfo(_tempFilePath);
                     FileInfo[] files = dir.GetFiles();
                     SortAsFileName(ref files);
                     if (files.Count() > 0)
                     {
                        for (int i = 0; i < files.Count(); i++)
                        {
                              #region 1
                              string name = files.FullName;
                              RasterImage rasterImage = _ocrEngine.RasterCodecsInstance.Load(name, 1);
                              IOcrPage ocrPage = _ocrEngine.CreatePage(rasterImage, OcrImageSharingMode.AutoDispose);
                              ocrPage.LoadZones(zonefilename);
                              ocrPage.Recognize(null);
                              IOcrPageCharacters pageCharacters = ocrPage.GetRecognizedCharacters();
                              string text = "";
                              if (pageCharacters.Count > 0)
                              {
                                 IOcrZoneCharacters _zoneCharacters1 = pageCharacters[0];
                                 text = ocrPage.GetText(0);
                                 if (string.IsNullOrEmpty(text))
                                    text = "";
                              }
                              //将识别结果放到dic中去
                              dic[name] = text;
                              //释放
                              rasterImage.Dispose();
                              ocrPage.Dispose();
                              #endregion
                        }
                     }
                  }
            }
            //完毕释放
            ocrEngine.Shutdown();
            ocrEngine.Dispose();
            return dic;
         }
         catch (OcrException ex)
         {
            MessageBox.Show(ex.Message);
            return new Dictionary<string, string>();
         }
         catch (Exception ex)
         {
            MessageBox.Show(ex.Message);
            return new Dictionary<string, string>();
         }
      }

这个进行ocr识别的函数。处理黑白图片的时候可以正常识别通过。但是一处理彩色图片就提示内存不足