Parameter Estimation for Perspective Projection Based on Camera Calibration in Skull-face Overlay
Craniofacial superimposition is a forensic process that aims to identify a missing person from a photograph and an unknown dead’s skull.One of the crucial steps is skull-face overlay in consistent with photographic space according to the face photo.Thus parameter estimation of perspective projection becomes key problem.In this paper,we employ a method of camera calibration based on vanishing point(VPBC) to estimate relevant parameters including perspective angle,orientation of camera and photographic object distance.Firstly,according to two vanishing points in image calculate the perspective angle and focal length using photo-geography theory; then evaluate camera direction and photographic object distance based on equal focal length; finally,map the 3D skull according to above known parameters,and implement skull-face overlay process.Result shows that this approach is effective,efficient and accurate for follow-up research work.
craniofacial superimposition camera calibration perspective projection photographic object distance
Wuxia Jin Guohua Geng Kang Li Yi Han
School of Information Science and Technology Northwest University Xian,China Department of Software Development Thoughtworks Company Xian,China
国际会议
西安
英文
317-320
2013-09-14（万方平台首次上网日期，不代表论文的发表时间）