how to differentiate between False Negative and False positive?

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yasmin ismail 2023-11-24

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https://ww2.mathworks.cn/matlabcentral/answers/2051767-how-to-differentiate-between-false-negative-and-false-positive

关闭： John D'Errico 2023-11-24

IF i used jaccard index to measure similarity between ground truth and model out put created to dect crack based on image segmentation and I got value of jaccrad =0.9 if I assume my threshold is 0.5 so if jaccard value >0.5 will be TP and if less will be FP

if Iou=0 it will be FN or what?