User's Manual

A PPENDIX A – Q UALITY AND C ONTENT

Scanning an Image

When the unit properly reads a fingerprint, it looks for image quality and fingerprint

content. When a raw image is collected from the sensor, the Veri-Series unit searches

for the fingerprint core.

Content scores are based upon the amount of non-ambiguous data in the region

of the core. The higher the content, the greater the degree of useful information.

See Section A.3 for a thorough discussion of content

Quality scores are based on how well the ridge pattern is defined within the image.

For best image quality, be sure that the sensor window is clear of dirt, residue, or

other material that can block the BII_Units view of the fingerprint. See Section A.3

for a thorough discussion on quality.

Once the image is scanned, the BII_Unit then creates and stores the resulting

fingerprint template.

Storing User Templates on the Unit

The Veri-Series unit recognizes users by matching current images to stored

templates of previously enrolled fingerprints. Along with the fingerprint, the

VeriProx and VeriFlex require a proximity card with a unique user ID number.

The Veri-Series readers allow associating multiple fingerprints with a single

Template ID. Each instance of a template with a specific ID has a unique index (up

to 256 indices possible (0-255)). This allows a VeriProx and VeriFlex users to have

a single proximity card, but be able to enroll multiple fingers. During

VERIFICATION, a user waves their card at the VeriProx / VeriFlex reader and

places their finger on the sensor. The unit will then scan the current fingerprint and

compare it against all enrolled templates for that specific ID. If there are multiple

templates enrolled under one ID, then the VeriProx / VeriFlex will check templates

in the numerical order based on their index.

Example: On Card # 123, a person ENROLLs both their left and right index

fingers. The next time that user goes to verify, they wave Card #

123 and place a finger on the sensor. The VeriProx scans the

current finger and compares it against the first template (the right

index finger, Template ID 123 0). If a match is found, the

VERIFICATION is PASSED and the operation ends. If a match is

not found, the VeriProx will check the second print (the left index

finger, Template ID 123 1). If a match is found, the

VERIFICATION is PASSED and the operation ends. If the match