Get a precision-recall graph for a recognition system

asked 2013-06-12 13:41:15 -0600

Uplink001 gravatar image

Hi all, i recently developed a sift-based recognition system and i'd like to get some measure of performance for it. I read about a "threshold" parameter which should be chosen to get precision-recall curves. I can't understand what this means. What exactly should i increase/decresce to plot the curve?

Thank you.

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The threshold means that you want to evaluate the certainty of an output result. For example, a pedestrian detector could give you a certainty score in the range of [-1,+1]. It would then be good to run the detections, and based on the returned score filter from -1 to +1 in steps of 0.05. Each threshold will yield other TP TN FP and FN results and thus another precision recall value. This can then be plotted!

StevenPuttemans gravatar imageStevenPuttemans ( 2015-02-12 02:18:05 -0600 )edit