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在犯罪现场上,我们经常遇到在床单、沙发垫等浅色物体上留下加层鞋印,而且往往由于鞋上沾附的灰尘很少,给拍照提取带来很大的困难。在唐山市新区的一起盗窃录像机和金银首饰的大案中,发现犯罪分子作案时曾经蹬踩过床单,便用各种灯光和变换各种角度观察,但由于加层的土很少,足迹与衬底反差极其微弱,均达不到满意的效果。最后当我们把浅兰色床单置于
At the crime scene, we often encounter on the sheets, sofa cushions and other light-colored objects to leave additional layers of shoes and India, and often due to the shoes with little dust attached to the photographic extraction has brought great difficulties. In the case of theft of video recorders and gold and silver jewelery in the New District of Tangshan City, criminals were found to have stepped on the sheets when using them for committing crimes. They observed them with various lights and transforms. However, due to the small amount of soil added, Contrast with the substrate is extremely weak, are not satisfied with the results. Finally, when we put light blue sheets on