摘要
纺织物上的微弱灰尘痕迹,如灰尘指印、足迹、尸体上的灰尘车轮印迹等痕迹,是物证摄影的难题之一。本文中运用"正交偏光轴法"偏振光物证摄影配光方法并结合"均匀布光法"、"分色法"等光学配光方法,对几种常见承载灰尘痕迹的纺织物检材,按其质料、纹线特点和颜色等进行了拍摄实验,实验中以"正交偏光轴法"为技术核心,辅之以不同的光照入射角、光照方向、曝光组合等技术条件,探索了显现固定这一类检材的配光和曝光的一般规律,成功消减了深色纺织物背景光斑,并显著加强了微弱灰尘痕迹的反差,获得纹线清晰的痕迹照片,对实战应用具有参考价值。
An experiment is performed in the paper utilizing orthogonal leaning optical axis,one method of photographing physical evidence with polarized light distribution,combined with even lighting method,color separation method and so on.In the experiment,several kinds of common fabrics bearing dust traces are photographed according to the material quality,the line characteristics and the color,and pictures with clear lines are obtained.The experiment is of reference value to actual combat application.
出处
《河北公安警察职业学院学报》
2008年第2期21-25,共5页
Journal of Hebei Vocational College of Public Security Police
关键词
纺织物
微弱灰尘痕迹
拍摄方法
fabrics
weak dust trace
method of photographing
