how to plot roc?

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Srinidhi Gorityala 2020-1-29

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https://ww2.mathworks.cn/matlabcentral/answers/502602-how-to-plot-roc

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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Answer 1

Star Strider 2020-1-29

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https://ww2.mathworks.cn/matlabcentral/answers/502602-how-to-plot-roc#answer_412678

Perhaps: plotroc?

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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........

Star Strider 2020-1-31

在 MATLAB Online 中打开

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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