Forensic Science Laboratory, Iwate Prefectural Police Headquarters, Morioka, Iwate, Japan.
Forensic Sci Int. 2010 Apr 15;197(1-3):97-104. doi: 10.1016/j.forsciint.2009.12.063. Epub 2010 Feb 8.
The applicability of computerised correction of optical distortion to two-dimensional (2D)/three-dimensional (3D) facial image superimposition was investigated. Two-dimensional (2D) facial images of 10 male volunteers were taken with a commercially available closed circuit device (CCD) camera (reference camera) at four areas of the lens field: the centre, top, upper right and right. Correction was made by computer by calculating differences vis-à-vis the co-ordinates of dots on a test chart. Discrepancies in facial outlines between the 3D and 2D images decreased following correction in all lens fields and were below the threshold for true positive. The correction method was also tested using an actual surveillance camera and video recorder installed in a bank. The method was found to be effective for the correction of facial images, especially those taken in the top and right lens fields. Since the total error (observed error) remaining after correction appeared close to the random error (real error), systematic error was thought to be minimised by correction. Therefore, the present method was thought to display high fidelity, and could be useful for supplementary examination of conventional superimposition.
研究了计算机光学失真校正在二维（2D）/三维（3D）面部图像叠加中的适用性。使用市售闭路设备（CCD）相机（参考相机）在镜头区域的四个区域拍摄了 10 名男性志愿者的二维（2D）面部图像：中心、顶部、右上角和右侧。通过计算测试图表上点的坐标差异，通过计算机进行校正。在所有镜头区域校正后，3D 和 2D 图像之间的面部轮廓差异减小，低于真阳性的阈值。该校正方法还使用实际安装在银行的监控摄像机和视频记录器进行了测试。发现该方法对于校正面部图像有效，尤其是在顶部和右侧镜头区域拍摄的图像。由于校正后剩余的总误差（观察误差）接近随机误差（真实误差），因此认为校正可以最小化系统误差。因此，该方法被认为具有高保真度，可用于常规叠加的补充检查。
