一、引言在刑事案件现场,金属类承受客体表面常留有立体痕迹。此类痕迹在现场痕迹中占有一定的比例。例如。枪弹表面,保险柜表面、锁、锁扣、门销等。此类金属客体表面形成的立体痕迹无伪装、变形小。在侦察中往往是破案的可靠依据。同时,在现场或侦察中常能提取到具有重要证据作用的凶器、作案工具 I. INTRODUCTION At the scene of a criminal case, metallic objects often bear three-dimensional marks on the surface of an object. Such traces occupy a certain proportion of the traces in the field. E.g. Bullet surface, safe surface, locks, locks, door pins and so on. The formation of such metal objects on the surface of the three-dimensional trace without camouflage, small deformation. In reconnaissance is often a reliable basis for solving the case. At the same time, on the scene or reconnaissance can often extract the important evidence of the weapon, tools of crime