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Near-infrared transillumination imaging of veins using low-cost camera and scattering suppression - validation of practicality of developed system

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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. | Tạp chí Phát triển Khoa học và Công nghệ, tập 20, số K3-2017 67 Near-infrared transillumination imaging of veins using low-cost camera and scattering suppression - validation of practicality of developed system Tran Trung Nghia, Phan Van To Ni, Tran Anh Tu, Kohei Yamamoto, Takeshi Namita, Koichi Shimizu 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 Manuscript Received on March 15th, 2017, Manuscript Revised on November 01st, 2017. This work was supported in part by Ho Chi Minh City University of Technology, VNU-HCM, under Grant TKHUD-2016-64. Tran Trung Nghia, Hochiminh City University of Technology, VNU-HCM, Vietnam (e-mail: ttnghia@hcmut.edu.vn). Phan Van To Ni, Hochiminh City University of Technology, VNU-HCM, Vietnam. Tran Anh Tu, Hochiminh City University of Technology, VNU-HCM, Vietnam. Kohei Yamamoto is with Hokkaido University, Sapporo, Japan. Takeshi Namita is with Kyoto University, Kyoto, .