勇士夺冠视频回放_最佳第一阵容_贝莱隆_-90vs即时比分 - 中国cba官网

Principle and characteristics of vein Technology

The principle of vein recognition technology is to recognize the vein according to the characteristics of the heme in the blood that absorbs infrared light. The gray-scale image of the vein in the finger can be acquired by taking infrared photos with the infrared camera, and then the image enhancement, filtering, normalization, binarization, feature extraction and other processes can be carried out. The spatial topological structure of the vein can be used to reliably and accurately determine the identity of an individual, it has the following characteristics:

The vein is the internal information of the body which cannot be stolen

● vein is under epidermis, dermis and subcutaneous tissue;

● most people have visible veins on the back of hand and wrist, and invisible veins can be collected by near-infrared light source:

The vein is different from each other forever

● the pattern of veins is determined by DNA;

● the thickness of blood vessels and skin will change with age, but the characteristics of venation remain unchanged:

● different veins in left hand and right hand, different veins in wrist, back of hand and fingers;

Living features

● only normal oxygenated blood can be imaged, and non living blood can not be imaged;

No- contact

● no need for full contact like fingerprint, non-contact imaging, no wear of the reading head

Wide adaptability

● anyone with a hand can use it