how to plot roc?

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Srinidhi Gorityala
Srinidhi Gorityala 2020-1-29
评论： Star Strider 2020-1-31
Helo everyone...Iam working on a dataset of 200 images consisting of both pothole and non-pothole images for the pothole detection.Finally my output is a binary segmented image. I have calculated TP,TN.FP,FN at three thresholds respectively.
For example, if the pothole area is covering atleast 40% of black pixels it is a pothole else it is not a pothole. Similarly, the other two thresholds are of 50% and 60%. For this scenario, can any one help to plot roc curve.

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Star Strider
Star Strider 2020-1-29
Perhaps: plotroc?
  2 个评论
Srinidhi Gorityala
Srinidhi Gorityala 2020-1-31
TPR = [0.71333333333 0.79333333333 0.86666666667];
FPR = [0.00000000000 0.00000000000 0.08860759494];
plot(TPR,FPR);
The above is the code i have used for plotting roc curve at 3 different thresholds. The curve looks strange.Did I evaluated the curve correctly?. Could anyone help me in plotting........plotroc.jpg
Star Strider
Star Strider 2020-1-31
According to the Wikipedia article on the Receiver operating characteristic (and specifically this plot figure, since it is easier to see) the plot arguments are reversed.
Try this:
TPR = [0.71333333333 0.79333333333 0.86666666667];
FPR = [0.00000000000 0.00000000000 0.08860759494];
figure
plot(FPR, TPR)
grid
axis([0 1 0 1]) % Optional (Displays Entire Axis Limits)
It would help to have more data to better define the curve.

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