脉冲参数对指纹放电成像质量的影响  

Influence of Pulse Parameters on Fingerprint Discharge Image

作　　者：翁明[1] 徐伟军[1] 郑华[1] 

机构地区：[1]西安交通大学,陕西西安710049

出　　处：《光电子．激光》2004年第1期69-72,共4页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金资助项目(50077015)

摘　　要：利用介质阻挡放电照相的原理,成功实现了对人体指纹的提取。在静态法提取指纹过程中,记录了在3种脉冲宽度(2ns,3μs,1ms)下放电的指纹图像。放电空间电场分布的分析表明,随着脉冲宽度的增加,正离子在介质层上的累积使得放电空间的电场趋于均匀,导致指纹放电强度在空间的均匀化,从而使指纹成像的分辨率下降。采用较高幅度的ns脉冲放电时,发现了指纹放电中存在丝状放电的痕迹。进一步的实验表明,即使在放电空间不存在介质时,也能观测到良好质量的指纹放电图像。研究结果表明,采用较小幅度的ns脉冲放电技术,不仅提高了指纹图像的清晰度,而且也实现了大气中的辉光放电。The human's fingerprint was acquired by using the dielectric barrier discharge photography technology. In the static state method of fingerprint acquirement, three discharge images for the applied voltage pulse width of 2 ns, 3 μs and 1 ms were recorded, respectively. Because of the positive ions cumulated on the dielectric film, the electric field intensity in the discharge gap trended uniformly, and the fingerprint discharge intensity also tended to be uniformly in space. This results in a weakened fingerprint image definition. When the use of the nanosecond pulse with higher amplitude, the filamentary discharge was discovered. Farther, even the absent of dielectric film in the discharge space, the good quality fingerprint discharge image was observed. The research results shows that by using the lower amplitude ns pulse, the fingerprint image definition is improved, and the atmosphere pressure glow discharge is obtained.

关 键 词：指纹提取 介质阻挡放电 高压纳秒脉冲 大气压辉光放电 脉冲宽度 指纹图像 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术] TN782[自动化与计算机技术—计算机科学与技术]