Learning OpenCV 4 Computer Vision with Python 3 - Third Edition

Discarding results based on the confidence score

The predict method returns a tuple, in which the first element is the label of the recognized individual and the second is the confidence score. All algorithms come with the option of setting a confidence score threshold, which measures the distance of the recognized face from the original model, therefore, a score of 0 signifies an exact match.

There may be cases in which you would rather retain all recognitions and then apply further processing, so you can come up with your own algorithms to estimate the confidence score of a recognition. For example, if you are trying to identify people in a video, you may want to analyze the confidence score in subsequent frames to establish whether the ...