探析高分辨率指纹特定条件下三级特征的稳定性

目的探索油墨捺印指纹显现三级特征稳定性的影响因素,排除主观条件的影响。方法在最适宜的条件下,通过油墨捺印采集不同压力下的指纹样本,清晰地显出指纹三级特征,用高分辨率扫描仪扫描试验样本,保存指纹样本,最后分析了指纹汗孔、细点线、纹线形态、皱纹等三级特征的反映性及稳定性,确定其鉴定价值。结果油墨捺印法对三级特征的反映性不够理想,汗孔、纹线形态特征、细点线特征及皱纹在不同压力下的稳定性较差。其中,各个三级特征在轻压下的反映性及稳定性较为接近实际,捺印的压力越大则三级特征变形越大,甚至完全变形成为另外一种特征。结论所以如果将此法应用于指纹比对时,仍需进一步的研究与改进。

Analysis of the Stability of Level 3 Features of High Resolution Fingerprint under Certain Conditions

Objective To explore the stability of Level 3 features of high-resolution fingerprint under certain conditions,so as to exclude the influence of subjective factors.Method Fingerprint specimens,which were imprinted with ink under different pressures and clearly showed the Level 3 features,were collected,and then scanned with a high-resolution scanner.The reflection and stability of Level 3 features such as fingerprint sweat pores,fine point lines,ridge morphology and wrinkles were analyzed to determine their identification value.Results The reflection of Level 3 features was less than ideal;characteristics of sweat pores,fine point lines,ridge morphology and wrinkles under different pressures was not stable.The Level 3 features under light pressures was close to reality;but the greater the pressure,the heavier the Level 3 features deformed,even completely deformed into different characteristics.Conclusion The theory of fingerprint identification based on Level 3 features is deficient,and needs further research and improvement.