Imaging quality analysis on palm vein under different wavelengths near-IR

In palm vein imaging system,in order to investigate the relation between light source wavelength and image quality,scattering and absorption characteristics of epidermis,dermis and fat in palm skin under near infrared light are analyzed and mathematical model is established.Then on this basis,it qualitative analyzes image quality under four single wavelengths including 760 nm,850 nm,890 nm and 960 nm.Finally,under the above mentioned four single wavelengths and six mixed wavelengths,it evaluates palm vein image quality by use of image contrast and two thousand and five hundred images are preprocessed and quantitative compared.Experimental results and theoretical analysis show that the image quality of palm vein is best under the light of 760 nm+960 nm wavelengths.