Retrieve the score that represents the certainty that a face has been detected in the image.
int camera_meta_get_face_score(const camera_metadata_t metadata, float *score)
The metadata supplied to the user-defined consumer function by camera_meta_iterate_metadata().
The returned face score as a value between 0 and 100.
This function is used to retrieve the score information (or face score) from the provided face metadata. The score is a value between 0 and 100 that represents the confidence that the object identified in the image is a face.