关键词: 手指静脉, 吸收特征, 背景图像, 残差图像

Abstract: According to the absorption feature of the finger towards the near-infrared，this paper proposes an approach to obtain the first residual error image based on the construction of background image，get the second residual error image through adjusting the scale factors，and finally indirectly gain the features of the vein.This paper detailedly discusses the absorption feature of the vein towards the near-infrared and the comparison between the error-residual extraction algorithm and some other direct extraction algorithms.This method tends to be simpler and more realizable，especially in the process of obtaining the second residual error image，much more accurate feature information can be got，simultaneously conforming to the requirements of the accuracy，continuity and smoothness.

Key words: finger vein, absorption characteristics, background image, residual image