关于正确重合头颅和人像的成像理论研究

A Study on the Imaging Theory of the Correct Superposition of Skull and Portrait

正确重合人头的头颅和脸面的图像是法庭技术中的一项重要课题.不正确的重合有可能再现一张错误的人像,对刑侦工作产生误导,甚至产生不幸的结果.本文从锥体投影成像原理出发,阐述人的脸面形成平面影像时的空间关系.对以往颅像重合检验中的仰俯角度矫正、检验容许误差、男女性别差、几何现势相似性等问题的不确切做法进行了数理方面的剖析.

The correct superposition of human skull and face portrait is a delicate subject of forensic technology.An incorrect superposition can guide to a faulty reproduction of a human face,consequendy misleading the crime investigation,the result may be miserable.On the basis of conical projection imaging principle,this paper elucidates the spatial relationship in the planar imaging of human skull and face.A series of misunderstandings happened during previous superposition techniques are analyzed and dissected through physical and mathematical calculations, e.g.look-up/look-down angle correction, tolerated identification error, gender difference,geometrical similarity etc.