Figure 14
Threshold estimation and validation. (a) The estimation of safe threshold value for a feature f 1. True positives are represented as green diamonds, false positives are represented as red circles. The threshold t 1 is increased (starting with 0) until all true positives are on one side (left) of the threshold. (b) The extension of (a) into two dimensions using an additional feature f 2 with a corresponding threshold t 2. Detections which are located in the rectangle bounded by both thresholds pass the validation (corresponding to a logical AND); all other detections are rejected.