In contrast to fingerprint access control devices which are generally installed in a fixed position, fingerprint authentication scanners are more likely to be used in varied positions and locations.
This brings about certain challenges as a result mainly of environmental factors, in particular with regard to light (ambient light), which can influence the fingerprint capturing process and will often cause a decrease in the quality of captured fingerprint images.
In response to this challenge, Suprema developed and patented multi-dynamic range (MDR) technology, which is unique to the industry, to ensure consistency in the quality of fingerprint images regardless of lighting conditions and the moisture level of finger skin.
MDR technology is available in selected BioMini models, namely BioMini Plus 2, BioMini Combo and BioMini Slim. MDR technology delivers greater benefits to mobile authentication applications where fingerprint scanners are connected to mobile devices in varied locations and positions.
Working in a similar mechanism to HDR used by cameras, Suprema’s MDR technology makes use of a unique image processing algorithm and thereby smartly blends high-brightness images and dark images of the same object to gain optimal image quality regardless of lighting conditions.
This fingerprint image acquisition method enhances the bright and dark part of the image, producing optimal results without any loss in details. With MDR technology, BioMini scanners can produce uncompromised image quality even under direct sunlight of up to 100 000 Lux.
This same technology is used to obtain optimal images, without any problems, for both dry and wet fingers. MDR technology makes the highlights appear lighter and shadows appear darker and in this manner, fine-tuned fingerprint images are acquired in accordance with express contrast.
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