Biometrics

How does image DPI affect error rates?
IDKit internally converts all images to 500DPI before extracting template. For this reason, 500DPI images provide highest accuracy. Lower DPI images are acc...
Tue, 8 Sep, 2015 at 12:44 PM
Why does verification return different score when fingerprints are compared the other way round?
This is normal behavior. Fingerprint matching algorithm is not symmetrical. Swapping gallery and probe fingerprints result in a slightly different score bec...
Fri, 18 May, 2018 at 2:21 PM
How can I use IDKit templates in other software?
IDKit templates cannot be used outside IDKit, because they contain various IDKit-specific information intended to improve accuracy and performance. IDKit ca...
Tue, 8 Sep, 2015 at 12:45 PM
Do you support ANSI/NIST ITL-2000 standard?
ITL-2000 is not supported. If you need standard template interchange format, you can use ANSI/INCITS 378. IDKit PC SDK can export templates in ANSI/INCITS 3...
Tue, 8 Sep, 2015 at 12:45 PM
What is the meaning of quality returned by IEngine_GetFingerprintQuality?
Function IEngine_GetFingerprintQuality returns a value between 0 and 100 approximating fingerprint quality with 100 denoting best quality and 0 denoting wor...
Tue, 8 Sep, 2015 at 12:45 PM
How exactly is the fingerprint quality calculated?
Fingerprint image quality is linked to the total surface of ridges found in the fingerprint ("usable" surface area which is not classified as back...
Wed, 16 May, 2018 at 9:12 PM
More details on normalization:
IEngine_GetTemplateQuality method does quality score normalization that is relative to the image size. The reason behind this is that our customers work wit...
Wed, 16 May, 2018 at 9:13 PM
I am getting lower quality score when I pad the image with white border.
This is normal behavior. The quality measurement function is designed to work with multiple types of sensors. For this reason, frame size is one of the para...
Tue, 10 Nov, 2015 at 11:17 AM
What fingerprint quality is sufficient for use?
Quality threshold depends on application. You should perform your own tests to adjust quality threshold. Generally we recommend minimum quality score 40 for...
Tue, 8 Sep, 2015 at 12:46 PM
Is fingerprint quality returned from IEngine_GetFingerprintQuality in accordance with BioAPI standard?
The quality measure is based on our internal algorithm and it does not try to comply with BioAPI nor any other standard. For compliance with NFIQ (NIST Fing...
Tue, 8 Sep, 2015 at 12:46 PM