问在人脸识别过程中，如何在matlab中为训练集中的每幅图像计算特征脸或pca算法的阈值？

EN

  %show the reconstructed image.
  subplot(1,2,2)
  imagesc(ReshapedImage); colormap('gray');
  title('Reconstructed image','fontsize',18)

  InImWeight = [];
  for i=1:size(u,2)
   t = u(:,i)';
  WeightOfInputImage = dot(t,Difference');
  InImWeight = [InImWeight; WeightOfInputImage];
  end

  ll = 1:M;
  figure(68)
  subplot(1,2,1)
  stem(ll,InImWeight)
   title('Weight of Input Face','fontsize',14)

    % Find Euclidean distance
     e=[];
   for i=1:size(omega,2)
       q = omega(:,i);
     DiffWeight = InImWeight-q;
       mag = norm(DiffWeight);
       e = [e mag];
         end

     kk = 1:size(e,2);
     subplot(1,2,2)
     stem(kk,e)
     title('Eucledian distance of input image','fontsize',14)

      MaximumValue=max(e)
      MinimumValue=min(e)