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Binoculars type, dual iris system for enrollment and large scale civil ID programs.




The BMT-20 is a binoculars-type, simultaneous dual iris capture system intended for enrolment applications, especially very large scale programs, in which subjects are presumed to have no prior experience in providing iris biometrics samples. Developed for and proven in the highly demanding India UID program, the BMT-20 offers the fastest capture speeds, superior usability, minimal failure-to-captures rates and outstanding image quality.
Most importantly, the instructions are easy to communicate, resulting in a simple experience for operator and subject alike. The user is simply directed to raise the BMT-20 to his or her eyes as if they were binoculars, touching the forehead bar to the subject just above the eye brows. Once the device is in position, they are asked to center their eyes in the internal mirror while keeping them wide open their eyes. The system does all the work of finding the irises and capturing pristine iris biometrics samples. The BMT-20 is extremely efficient: once the subject’s eyes are centered, the iris images are captured in 1.0 second or less.
The BMT-20 features the largest depth of capture of any binoculars type camera on the market. This capture range, a full 30 mm, covers the range in the position of the iris relative to the forehead of the entire population of adults and children down to 5 years old. This means that all irises are within the focus capture zone when the BMT-20 is touching the forehead. By eliminating the need to reposition the eyes during exposure, the system is consistently fast and highly robust for large scale programs. It also offers the largest interpupillary distance range of any device on the market of 40 to 90 mm, enabling image capture on children, again as young as 5 years of age.
The BMT-20 meets the stringent requirements for IP64, which means the device is highly resistant to contamination from the smallest of airborne particles such as dust and dirt. The system also includes an internal white LED that serves to constrict subject’s pupil diameters to a consistent level, thereby improving the quality of the enrolment image even in low light ambient environments.



  • Ideal for national and civil ID programs
  • Enrolment of non-acclimated subjects including children to 5 years of age
  • Lightweight and robust with IP64 rating
  • Powered from USB 2.0 connection
  • Usable in bright sunlight conditions

Key Features

Key Features

Feature User Advantages
State-of-the-art optical design 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 the ISO 19794-6 standard.
Single sensor design 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.
Long internal optical path 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.
Dedicated, on-board image processor supports very high speed, simultaneous capture of subject’s irises 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 half (0.5) second from the time that the subject places the system on his or her forehead.
Extended depth of field 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.
Wide inter-pupillary distance tolerance 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.
All solid-state design—no moving parts The superior optical design of the BMT-20 provides the widest inter­pupillary distance and depth of field without needing any moving components. Reliability and durability are optimized with an all solid-state design.
Meets IP64 specifications for particulate intrusion prevention Meeting this very high standard means that the BMT-20 is highly resistant to contamination by the very small airborne particles such as dust and dirt, that are 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.
Near-real time off-axis gaze detection Capturing the correct position of the eyes is essential for optimal iris biometrics. The system automatically detects subject gaze angle (i.e. whether the subject is looking directly ahead at the imager). If the subject is looking away, the system will automatically wait until the subject looks straight ahead before capturing a valid iris biomet­ric image.
Internal white LED Internal white light emitting diodes (LEDs) are turned on just prior to imaging. Constricting the subject’s pupil provides ideally-sized pupils for optimal iris biometric identification and authentication.


In dark rooms, the pupils of most subjects will dilate, shrinking the amount of iris area, which diminishes the effectiveness of the iris biometric image. By making the iris area larger, the iris biometric im­ages are optimized.

Motion detection System detects eye motion relative to the system, and waits until sub­ject meets motion threshold (which is adjustable), thereby minimizing motion blurring of images.
Foldable side visors and forehead positioning rest Side visors and the forehead positioning aid on the BMT-20 block bright light, including direct sunlight, from entering the optical path of the system during imaging. In this way, the BMT-20 will deliver ideal iris biometrics imaging, even when operated outdoors.
External color LED positioning indicators The BMT-20 can be operated in two modes: either by the subject or a trained operator. Subjects are given short and easy to understand instructions. Operators center the system over the subject’s eyes, based on the following external color LED’s:

  • Red: Device is too high
  • Blue: Device is too low
  • Green: Device position is OK
Position sensor A position sensor detects if the system is upside down, preventing capture of images that can be reversed, left and right. This ensures that all iris biometric samples are exactly as intended.
High temperature range 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, even in the hottest of summer days.
Powered by USB 2.0 cable The BMT-20 can operate without an independent power supply. Fully power over USB 2.0 cable (maximum 500 mA at 5.0 V).

Use Cases

Use Cases

  • National-Scale ID Projects
  • Voter Registration
  • Digital Identification and Certification System
  • Electronic Medical Records Access Control
  • Law Enforcement and Defence Sector
  • Border Control, National Security and Passport Issuance

Technical Specifications

Technical Specifications

Dimensions 219 x 161 x 58 mm (8.6 x 6.3 x 2.3 inches)
Unit weight 680 g (1.5 lbs)
Image output Meets or exceeds ISO 19794-6 standard
MTF / spatial resolution Exceeds 4.0 lp/mm @ > 60% contrast
Pixel resolution 18.4 to 20 pixels/mm
Iris image pixel resolution 640 x 480 pixels
Optical path distance 350 to 380 mm
Depth of field 30 mm (1.2 inches)
Inter-pupillary distance range 40 to 90mm (1.6 to 3.5 inches)
Time of capture Typically around 0.5 second, from time of proper head placement
IR illumination for iris imaging Dual LED: wavelengths of 850 nm nominal (about 60%); and 750 nm nominal (about 40%)
Internal LED for pupil contraction Broadband visible (white)
External LED indications for operator Red: Device position is too high

Blue: Device position is too low

Green: Device position is OK

White: Image capture in progress

assisted positioning 0 to 50˚C
Operating temperature range 10 to 90% RH, non-condensing
Humidity IEC 62471, IEC 60825-1
Eye safety standard IP64
Ingress protection USB 2.0 High Speed
Interface USB 2.0 (500 mA at 5V)

No additional power required

PC hardware requirements PC/x86 platform: Intel® Atom™ or above processor

ARM: Cortex A9 quad core processor

OS compatibility Windows 7, 8, 8.1 and 10 (32 and 64 bit)

Linux Ubuntu 12.04 distribution

Android 4.0 and above

Other certifications CE , FCC, USB-IF, India STQC, RoHS, WHQL