Question

我使用Emgu.cv进行人脸识别应用。它将图像存储在数据库中，并在识别后告知图像的名称。我的问题是，它没有告诉未知的人，但它自动匹配数据库中最相关的面，并告诉错误的名称。

我想展示＆＃34;未知＆＃34;不明人士的字符串。我使用了以下代码：

  public String Recognize(Image<Gray, Byte> image)
  {
     int index;
     float eigenDistance;
     String label;
     FindMostSimilarObject(image, out index, out eigenDistance, out label);

     return (_eigenDistanceThreshold <= 0 || eigenDistance < _eigenDistanceThreshold )  ? _labels[index] : String.Empty;
  }


  public EigenObjectRecognizer(Image<Gray, Byte>[] images, String[] labels, double eigenDistanceThreshold, ref MCvTermCriteria termCrit)
  {
     Debug.Assert(images.Length == labels.Length, "The number of images should equals the number of labels");
     Debug.Assert(eigenDistanceThreshold >= 0.0, "Eigen-distance threshold should always >= 0.0");

     CalcEigenObjects(images, ref termCrit, out _eigenImages, out _avgImage);

     /*
     _avgImage.SerializationCompressionRatio = 9;

     foreach (Image<Gray, Single> img in _eigenImages)
         //Set the compression ration to best compression. The serialized object can therefore save spaces
         img.SerializationCompressionRatio = 9;
     */

     _eigenValues = Array.ConvertAll<Image<Gray, Byte>, Matrix<float>>(images,
         delegate(Image<Gray, Byte> img)
         {
            return new Matrix<float>(EigenDecomposite(img, _eigenImages, _avgImage));
         });

     _labels = labels;

     _eigenDistanceThreshold = eigenDistanceThreshold;
  }

Answer 1

EigenObjectRecognizer返回String.Empty

       return (_eigenDistanceThreshold <= 0 || _eigenDistance < _eigenDistanceThreshold )  ? _labels[index] : String.Empty; // <--- this one

每当发现身份不明的人时

为了表明此人是“未知”，当您尝试检测并识别某人时，您可以使用以下代码

      ImageFrame.Draw(string.IsNullOrEmpty(name) ? "UNKNOWN" : name, ref font, new Point(f.rect.X - 2, f.rect.Y - 2), new Bgr(Color.Green));

将此添加到您的识别表单

希望它有所帮助

如何将Emgu.cv用于未知人员？

1 个答案: