硅胶伪造指印识别方法研究

研究硅胶伪造指印识别要点,为识别硅胶伪造指印提供依据。分别制作硅胶伪造指纹膜,然后用硅胶仿生指纹膜和同一手指在相同情况下蘸取印泥,在A4纸上垂直按压形成印泥指印,比较硅胶伪造指印与真实指印的特征差异。结果表明,真实指印的单根乳突纹线颜色深浅之间有过渡,有立体感,或者有细微漏白,而硅胶伪造指印没有以上特征;真实指印中汗孔的反映性不稳定,有时也没有反映,而硅胶伪造指印中,汗孔特征一般无法反映;纹线粗细、纹线间隔、空白特征和细节特征等受捺印力度等因素的影响,两者之间没有明显差异。在识别硅胶伪造指印过程中,可以将单根乳突纹线墨迹分布特征和汗孔特征作为识别硅胶伪造指印的主要依据,其他特征可以作为重要参考,应从多方面综合分析需检指印。

This paper studiesthe key points of identifying silica gel forged fingerprints to provide a basis for identifying silica gel forged fingerprints.Silica gel forged fingerprint films were made separately,and then the silica gel bionic fingerprint film and the same finger were used to dip the inkpad under the same circumstances,and vertically pressed on A4 paper to form an inkpad fingerprint.The characteristic differences between the silica gel forged fingerprint and the real fingerprint were compared.The results show that there is a transition between the color and depth of the single mastoid line of real fingerprints,a three-dimensional effect,or a slight white leakage,while silica gel forged fingerprints do not have the above characteristics;the reflection of sweat pores in real fingerprints is unstable and sometimes not reflected.In silica gel forged fingerprints,the characteristics of sweat pores are generally not reflected;the thickness of the lines,the spacing of the lines,blank features,and detail features are affected by factors such as the pressure of the stamp,and there is no significant difference between the two.In the process of identifying silica gel forged fingerprints,the ink distribution characteristics of single mastoid lines and sweat pore characteristics can be used as the main basis for identifying silica gel forged fingerprints.Other characteristics can be used as important references,and fingerprints to be detected should be comprehensively analyzed from multiple aspects.