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6.7 Threshold
In a 1:N Matching, scores are generated for each comparison. Generally, the highest scores exceeding the threshold results in identification. You can compute the Threshold. By clicking “Unsupervised/N:M Analysis/Threshold (b1_matchlist.txt required)”, you will get:
Possible Threshold = 68
Absolute Threshold = 97
To satisfy the requirements in b1_matchlist.txt, you will need to set a threshold of 68. If you want an image to only match itself, the threshold is 97.
Indeed, if we set the Threshold to 68, the output will be 538 retrieved images instead 812. There are still 218 correct matches.
Setting parameters are the topics of later chapters.
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