基于高光谱成像技术鉴别血痕种属的实验研究

Identifying Bloodstain Species Using Hyperspectral Imaging

刑事技术领域中血痕的种属鉴定在判断案件性质、确定侦查方向等方面有重要作用,探索用光谱无损的方法进行种属鉴定。使用CRi Nuance光谱成像仪搭载MISytem 3.0光谱影像分析软件在450 nm~950 nm波谱范围内对30种载体上的人血痕迹样本、动物血痕迹样本、人血动物血混合血痕迹样本3类共计180组对象进行光谱成像分析,并用样本中两种物质的斜率之差分析实验结果。高光谱成像技术鉴别不同载体上人血和动物血及其混合血的实验结果表明,三种血痕在大多数载体上可被区分,区分率均在70%以上,为确定或排除嫌疑提供了参考。所提方法补充了血痕种属鉴定的方法体系,可在血痕鉴定领域进一步推广使用。

In criminal technology,identifying bloodstain species is essential in determining the nature of a case and investigation direction.This study explores spectral nondestructive species identification method.Using CRI Nuance spectral imager to carry MISytem 3.0 spectral image analysis software,in the spectrum range of 450 nm-950 nm,180groups of objects including human blood trace samples,animal blood trace samples,and mixed human and animal blood trace samples on 30 carriers were analyzed by spectral image analysis.Results were analyzed using the slope difference between the samples’two substances.The hyperspectral imaging revealed that the three types of bloodstains could be distinguished on most carriers,with discrimination rate exceeding 70%.This study supplements the bloodstains species identification method and serves as a reference for an optical nondestructive bloodstain examination.