Due to the difficulties of the copying, vein identification has developed rapidly in recent years. The light source selection directly affects the image quality. This paper acquired by experiment the reflectivities of vein and non-vein irradiation with different wavelengths of near infra-red. Comparing the strength of reflectivities of various wave lengths, we found that there were the strongest contrasts between vein and non-vein in the 810 nm, and 810 nm near infra-red was suitable to a vein imaging light source. Finally, clear hand vein images were obtained with the selected light source.
Algorithms ; Biometry ; methods ; Hand ; anatomy & histology ; blood supply ; Humans ; Image Enhancement ; Image Processing, Computer-Assisted ; methods ; Infrared Rays ; Pattern Recognition, Automated ; Tomography, Optical ; methods ; Veins ; anatomy & histology