ATM电子监控预测身高的数学模型

A mathematical model for predicting body height by electronic vidicon of ATM

根据像高预测真实身高的数学模型,用matlab 6.5编程求解,建立以像高、拍摄对象与镜头的垂直距离和偏离距离为自变量的三维线性插值模型,寻找ATM电子监控器的最佳镜头焦距。通过实验测定不同焦距、不同身高的拍摄对象与镜头不同距离得到的像高,对置于1.2 m高处的ATM监控器,使用焦距为4 mm的镜头预测效果最好,84%的点预测误差在±2 cm内,预测结果与实际身高无显著差异。三维线性插值有效地应用于ATM电子监控器身高的预测,可作为刑侦破案辅助手段。

A mathematical model for predicting a person＇s real body height according to his （or her） height on photo was designed by programs operated in matlab 6.5. Its independent variables include the height on photos, the perpendicular distance and the departure distance between the person who was photographed and the lens, and the best lens focus of the vidicon of ATM. We experimentally determined the height on photos in different focus, at different distances from the lens of the vidicon and different body heights. When the vidicons were placed at the height of 1.2 m, the best prediction result could be obtained using the type of lens whose focus was 4 mm, and 84 error points were obtained in the range of ±2 cm. There was no significant deviation between the real body height and the corresponding predicted results. Our model, named 3D linear interpolation, can efficaciously be used to predict body height in the vidicon of ATM. It thus can assist in criminal investigation.