How to calculate true positive , true negative, false positive and false negative as we have segmented and ground truth

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marwa Saad 2018-9-14

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https://ww2.mathworks.cn/matlabcentral/answers/418986-how-to-calculate-true-positive-true-negative-false-positive-and-false-negative-as-we-have-segment

评论： Amel Kaouane 2022-1-5

calculate true positive , true negative, false positive and false negative as we have segmented and ground truth is that code is correct idx = (expected()==1)

p = length( expected(idx)) n = length( expected(~idx)) N = p+n tp = sum( expected(idx)== predicted(idx)) tn = sum( expected(~idx)== predicted(~idx)) fp = n-tn fn = p-tp

accuracy=(tp+tn)/(tp+tn+fp+fn)

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采纳的回答

KALYAN ACHARJYA 2018-9-14

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https://ww2.mathworks.cn/matlabcentral/answers/418986-how-to-calculate-true-positive-true-negative-false-positive-and-false-negative-as-we-have-segment#answer_336798

编辑：KALYAN ACHARJYA 2019-11-17

%Last year I answered this way, you can avoid the loop (Recommended)

   TP=0;FP=0;TN=0;FN=0;
      for i=1:400;
          for j=1:400;
              if(gold_data(i,j)==1 & test_data(i,j)==1);
                  TP=TP+1;
              elseif(gold_data(i,j)==0 & test_data(i,j)==1);
                  FP=FP+1;
              elseif(gold_data(i,j)==0 & test_data(i,j)==0);
                  TN=TN+1;
              else
                  FN=FN+1;
              end
          end
      end