Abstract
Near-infrared (NIR) transillumination imaging is useful in many biomedical applications such as human biometrics and animal experiments. However, the image quality is generally poor due to the strong scattering in the body tissue. The authentication using the transillumination image of the palm vein and the finger vein is common these days, but there are some problems left such as misidentification and unidentifiability. To solve these problems with a simpler system than common ones, we have attempted to develop a biometric identification technique using the NIR transillumination and scattering suppression techniques. An array of LED's was placed at one side of the palm and a transillumination image was obtained with a low-cost CCD camera at another side of the palm. The image was processed by the deconvolution with the appropriate point spread function (PSF). The PSF was originally derived from the diffusion approximation of transport equation for the light source in turbid medium. We found that it can be applied for the scattering suppression in transillumination imaging of absorbing structure inside turbid medium. Even with the simple system, a clear vein image which was sufficient for authentication was obtained successfully.
Highlights
The importance of transillumination imaging for blood vessels using near-infrared (NIR) light for medical and biometrics fields has been recognized [1-2]
We developed the NIR transillumination technique using low-cost charge-coupled device (CCD) camera and a scattering suppression technique
Where P, A, and PSF respectively represent the functions of projection, blurred absorption distribution and point spread function. denotes the deconvolution operation. (x,y,z), and di respectively represent the Cartesian coordinates, orientation of observation, and the i-th depth, respectively. i = 1, 2 ...n, and n is the number of different depths
Summary
The importance of transillumination imaging for blood vessels using near-infrared (NIR) light for medical and biometrics fields has been recognized [1-2]. Using the NIR transillumination imaging technique, we can visualize the blood vessels inside the tissue [2]. The observed image is severely blurred because of the strong scattering in the tissue, as the depth of the vessels increases. This is one of the major fundamental problems to cause misidentification and unidentifiability in personal authentication with. Science and Technology Development Journal, vol 20, no.K3- 2017 transillumination images To overcome these problems, we developed the NIR transillumination technique using low-cost charge-coupled device (CCD) camera and a scattering suppression technique. 2.1 Applicability of light-source PSF to transillumination images of lightabsorbing structure
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
