User's Manual

The optional coaxial light feature v
The optional coaxial light feature
The D SCAN® AUTHENTICATOR CF is a high performance device for reading
all kinds of personal identification documents such as passports and national ID
cards. Any document compliant to the specifications of the ICAO can be placed
on the glass plate on top of the device for capturing the image of the personalized
page. The optional RFID feature further provides the functionality for reading out
the contents of the digital data chip contained in the new electronic passports.
How does the optical reading of the device work?
The D SCAN AUTHENTICATOR CF device contains a built-in high resolution
camera and several sources of light. Each light source can be turned on before
taking one image with the camera. Thereby the user can take an image of the
personalized page as it appears under normal visible light or under ultraviolet
(UV) or infrared (IR) light. In the interest of a very uniform intensity level of the
light on the document page being captured the light sources are arranged in a way
to provide a diffuse kind of light rather than a directed light under a specific angle.
This is also helpful to avoid reflections. After the image was taken by the build-in
camera it is being transferred through the USB 2.0 interface cable to the PC. The
software belonging to the D SCAN AUTHENTICATOR CF receives the image
and makes it available through the Application Programming Interface (API).
Thereby the image becomes accessible for the application software of the system
integrator.
Among the available options is the "coaxial light" feature. This is an illumination
which works similar to the other ones but delivers its light under the same angle as
the camera view angle to the document. Thereby camera and illumination are
arranged on the same axis - or coaxially, hence the name.
Which functionality does the coaxial light feature
provide?
This optional feature provides the functionality of turning the coaxial illumination
on while all other illuminations are off, taking one image with the camera, turning
the coaxial illumination off, and making the captured image available as a digital
bitmap via the API to the application software of the system integrator. The
application can then take this image and display it on the screen of the PC so that
the operator can view it.