How can i plot roc curve for comparing three segmentation techniques? i have value of tpr, fpr for each segmented image evaluated in comparison with its ground truth. i also have a threshold value for each segmented image. how to plot a roc curve?

How can i plot roc curve for comparing three segmentation techniques? i have value of tpr, fpr for each segmented image evaluated in comparison with its ground truth. i also have a threshold value for each segmented image. how to plot a roc curve? please help me in this.

Answer 1

[KALYAN ACHARJYA]

• One threshold, calculate the sen and 1-speficity of one image, do the same for another image, get another sen and 1-speficity points, take average - from all images of the database> One average ROC points--
• Another threshold, calculate the sen and 1-speficity of one image, do the same for another image, get another sen and 1-speficity points, take average - from all image of the database> another average ROC points--
• soon...ROC curve..

[KALYAN ACHARJYA]

For the different ROC curves, first do the steps for one, you will understand. The threshold values should be the same to compare different methods.

[KALYAN ACHARJYA]

[KALYAN ACHARJYA]

After the number of ROC curves based on different methods (tested in same database and the threshold values are same), graph look like as following- (Red line Reference Line-Not ROC Curve)

[chetna kaushal]

thankyou so much sir :)

[KALYAN ACHARJYA]

My pleasure @chetna