Question

我有两个OCR引擎。其中一个更快，但另一个有更好的认可（Abbyy）所以我正在做的是启动两个在新的单独Thread上运行的OCRWorker。他们完成后举起一个事件。我在HandlerMethod中得到了两个引擎的结果，但我希望它们以某种方式同步并获得更好的结果。
此外，我想知道这种开始并列任务的方式是否是一种好方法，如果不会遇到可能的死锁。
这是我的代码：

本部分启动OcrEngineThreads

private void OnAreaSelected(object sender, EventArgs e)
{
  var bmp = (Bitmap)SnippingTool.Image;
  _runningOcrTasks = new List<Task>();
  foreach (var engine in _ocrTextRecognizer)
  {
    var ocrWorker = new OcrWorker(bmp, engine);
    ocrWorker.ocrFinishedEvent += OnOcrWorkerFinished;
    ocrWorker.Run();
  }
}

// Both Threads run into this Method
private void OnOcrWorkerFinished(object sender, OcrFinishedEventArgs args)
{
  // I pass this point two times und would like 
  // to protect it from Deadlock and synchronize the result.
  var result = args.Result;
}

  class OcrWorker
  {
    private Thread t;
    private Bitmap bmp;
    private IOcrTextRecognition _ocrEngine;
    public event OcrRecognitionFinishedEvent ocrFinishedEvent;


    public OcrWorker(Bitmap bmp, IOcrTextRecognition ocrEngine)
    {
      this._ocrEngine = ocrEngine;
      this.bmp = bmp;
      this.t = new Thread(StartRecognizeText);
    }

    private void StartRecognizeText()
    {
      string result = this._ocrEngine.ScanImageForText(this.bmp);
      OcrFinishedEventArgs finishedEventArgs = new OcrFinishedEventArgs(true, result);
      if (ocrFinishedEvent != null)
      {
        ocrFinishedEvent.Invoke(this, finishedEventArgs);
      }
      t = null;
    }

    public void Run()
    {
      this.t.Start();
      if (!t.Join(TimeSpan.FromSeconds(20))) {
#if (!DEBUG)
        t.Abort();
        throw new TimeoutException("OCR recognition took too long");
#endif
      }
    }
  }

  public delegate void OcrRecognitionFinishedEvent(object sender,  OcrFinishedEventArgs args);

  public class OcrFinishedEventArgs
  {
    public bool Success { get; }
    public string Result { get; }

    public OcrFinishedEventArgs(bool success, string result)
    {
      Success = success;
      Result = result;
    }
  }

同步两个OCR引擎结果

0 个答案: