The BMT-20 is a binoculars-type iris biometrics imaging device that simultaneously and quickly captures highest quality iris biometric images. Easy to use, the system can be reliably positioned by the subject with minimal instructions, or by an operator with the aid of positioning feedback LEDs on the top of the imager s housing.
The patent-pending optical design of the BMT-20 features expanded depth of field and a very large tolerance for inter- pupillary distance, which provide superior tolerance for the positioning of all subjects eyes. The BMT-20 is ideal for enrollment programs of all sizes, including those involving very young children.
Designed with the latest in optical and system control technology by one of the leaders in the industry, the BMT-20 is physically robust, highly reliable and durable. Meeting the elevated IP64 intrusion protection standard, this system is sealed against dust and other airborne particles to provide extended life in harsh environmental conditions.
The optical design includes utilizing highest quality optics and long internal optical path, which allows the BMT-20 to exceed industry standards for image quality as specified by ISO in the 19794-6 document. The standard is 4.0 lp/mm at 60% contrast ratio.
The proprietary and patented single sensor design interleaves left and right iris images for simultaneous capture. By utilizing only a single sensor, power consumption through the USB connection is minimized. This allows for optimized NIR illumination, resulting in the shortest exposure times possible, thereby minimizing any potential for motion blurring.
The optical design is folded within the BMT-20 system, providing the longest optical path of any binoculars-type iris recognition imager. At 365 mm ( +/- 15 mm), the long optical path provides much greater depth of field while minimizing optical distortions.
In real-time coordination with the host PC software, the on-board image processor facilitates very high speed image capture, resulting in the fastest and most robust capture of both of the subject s irises at the same time. Typically, both irises are captured within one (1.0) second from the time that the subject places the system on his/her forehead.
The BMT-20 is capable of imaging over a depth of 30 mm, making the system highly tolerant of a) subject positioning in the ￼ Z ￼ dimension and b) how deep the subject s eyes are relative to his / her forehead. The BMT-20 therefore offers highly robust iris imaging across the widest range of people, including small children.
The BMT-20 can capture iris image pairs from subjects with inter- pupillary distances as small as 4.0 cm, which is the minimum distance for a child of 5 years old. This makes the BMT-20 ideal for enrollment of all subjects within all national identity programs.
The superior optical design of the BMT-20 provides the widest inter- pupillary distance and depth of field without needing any moving components. Reliability and durability are optimized with an all solid- sate design.
Meeting this very high standard means that the BMT-20 is highly resistant to contamination by very small airborne particles such as dust and dirt, such as would be commonly found in harsh non-conditioned enrollment environments. Stringently tested against this standard, this feature will provide extended life and high reliability. Other systems only meet the lesser IP54 specification.
Internal, white light emitting diodes (LEDs) are turned on just prior to imaging to constrict the subject s pupil for iris biometric image capture, providing ideally sized pupils for optimal iris biometric identification and authentication.
Detection of subject gaze angle (i.e. whether the subject is looking directly ahead at the imager), which is the correct position of the eyes for optimal iris biometrics. If the subject is looking away, the system will automatically wait to capture a valid iris biometric image until the subject does look straight ahead.
System calculates eye motion relative to the system, and waits until subject meets motion threshold (which is adjustable) in order to assure there is no adverse motion blurring of images.
Side visors and the forehead positioning aid on the BMT-20 combine to block bright light, such as sunlight, from entering the optical path of the system during imaging. In this way, the BMT-20 can be utilized outdoors and still deliver ideal iris biometrics imaging.
The BMT-20 can be operated in two modes: first by the subject himself after being giving short and easy to understand instructions. The system can also be operated by a trained operator, who will position the device based on external color LED s to center the system over the subject s eyes.
A position sensor detects if the system is upside down, preventing capture of images that can be reversed, left and right. This assures that all iris biometric samples are exactly as intended.
The tested and certified operating temperature range of the BMT- 20 is a full 0 to 50 degrees Celsius, making the system fully useable in non-conditioned environments in the hottest of summer days.
The BMT-20 is fully powered by the USB 2.0 connection (maximum 500 mA at 5.0 V), which means that it operates without an independent power supply.
Red: Device position is too high
Blue: Device position is too low
Green: Device position is OK
White: Image capture in progress
Intel ￼ Atom ￼ or above processor
Windows XP 32 bit or above
Linux OS version of SDK and drivers in progress