User's Manual

A PPENDIX A – Q UALITY AND C ONTENT

A thorough enrollment procedure will ensure streamlined and reliable verification

for users. It is recommended that all four options be performed in the order listed

above to maximize the performance of the device.

Content

The Content score is based upon the amount of usable information the Veri-Series

unit sees in the fingerprint. Templates that are characterized by low content scores

may result in elevated rates of false acceptance.

Again, the score is given in stars («) and ranges from zero to five stars, with five

being the most content and zero being the least. Content scores of three stars and

higher perform well with the Bioscrypt Algorithm. In this range the algorithm has

enough information to distinguish between different fingerprints with a high level of

accuracy. Templates with content scores above two stars do not vary in terms of

the error rates.

Content scores less than three stars require intervention on the part of the Enroller

or administrative software. Sources of poor content include improper finger

positioning and extremely bland fingerprints.

If the content score falls below three stars, Bioscrypt recommends the following

options:

• Try re-enrolling the same finger if finger positioning seems to be the issue

(see section A.2). Ensure that the user can comfortably place the finger on

the sensor while maintaining the core region in the image.

• Fingerprint content can vary among individual fingers for the same person.

Try enrolling an alternate finger to see if the score improves.

• Alter the security level for that particular template by increasing the

threshold a minimum of 1 level (e.g., change the value from medium [3] to

high [2]). This will offset the false acceptance for that template by making it

more difficult to match. If use of that template indicates that raising the

threshold one level still produces false rejections, try setting the value to its

highest security (level 1).

Very High

Content

Low Content