De Angelis Danilo, Sala Remo, Cantatore Angela, Grandi Marco, Cattaneo Cristina
Labanof (Laboratorio di Antropologia ed Odontologia Forense), Istituto di Medicina Legale, Università degli Studi di Milano, Via Mangiagalli 37, 20133 Milano, Italy.
Int J Legal Med. 2009 Jul;123(4):351-6. doi: 10.1007/s00414-008-0311-x. Epub 2008 Dec 12.
The paper describes a procedure aimed at identification from two-dimensional (2D) images (video-surveillance tapes, for example) by comparison with a three-dimensional (3D) facial model of a suspect. The application is intended to provide a tool which can help in analyzing compatibility or incompatibility between a criminal and a suspect's facial traits. The authors apply the concept of "geometrically compatible images". The idea is to use a scanner to reconstruct a 3D facial model of a suspect and to compare it to a frame extracted from the video-surveillance sequence which shows the face of the perpetrator. Repositioning and reorientation of the 3D model according to subject's face framed in the crime scene photo are manually accomplished, after automatic resizing. Repositioning and reorientation are performed in correspondence of anthropometric landmarks, distinctive for that person and detected both on the 2D face and on the 3D model. In this way, the superimposition between the original two-dimensional facial image and the three-dimensional one is obtained and a judgment is formulated by an expert on the basis of the fit between the anatomical facial districts of the two subjects. The procedure reduces the influence of face orientation and may be a useful tool in identification.
该论文描述了一种通过与嫌疑人的三维面部模型进行比较，从二维图像（例如视频监控录像）中进行识别的程序。该应用旨在提供一种工具，有助于分析罪犯与嫌疑人面部特征之间的匹配或不匹配情况。作者应用了“几何兼容图像”的概念。其思路是使用扫描仪重建嫌疑人的三维面部模型，并将其与从视频监控序列中提取的显示犯罪者面部的帧进行比较。在自动调整大小后，根据犯罪现场照片中框出的嫌疑人面部手动完成三维模型的重新定位和重新定向。重新定位和重新定向是在人体测量学标志点处进行的，这些标志点对该人来说是独特的，并且在二维面部和三维模型上都能检测到。通过这种方式，获得了原始二维面部图像与三维面部图像之间的叠加，并由专家根据两个对象面部解剖区域之间的拟合情况做出判断。该程序减少了面部方向的影响，可能是识别中的一种有用工具。
