Characteristic circle is adopted for characteristic mark ; a new concept , “ characteristic diameter ” , is put forward ; the length and the position of the characteristic diameter ’ s image is adopted for the basic “ characteristic parameters ” ; and a new “ resolving model ” is established based on perspective projection principle and the speciality of “ characteristic diameter ” in this article , so that the normal direction of target plane can be got without calibrating camera parameters in real time . it only need basic mathematic tools 本文采用特征圆作为靶面上的“特征标志” ;提出了“特征直径”的概念,采用特征直径及其在像面上的透视投影的位置和长度作为基本的“特征参数” ;根据透视投影的规律,应用特征直径的特性,建立了新的“解算模型” ,无须在现场标定摄像机的参数,只需采用基本的数学工具即可实时解算出靶面法线的方向。
The optical characteristics for stn - lcd with film compensation are determined mainly by the anisotropy of refractive index of liquid crystal material , the distribution of director in liquid crystal layer , the orientation of polaroids and the compensating films " orientations and their optical retardations 膜补偿stn - lcd的光学传输特性主要取决于液晶材料的折射率各向异性( n _ e和n _ o ) 、液晶层中指向矢( director )沿层面法线的分布、前后偏振片的方位角和补偿膜的方位角及光学延迟。
In this paper , an approach of the systematic artificial neutral net was introduced into the analysis on the ship - against - bridges probability with a computer programs . based on the basic data of the present 12 typical bridges as the sample , 4 chief influential factors as the input coefficient , such as the bridge span , the water flow rate , the incline angle between water flow direction and the direction normal to bridge axis , and the curve in the course near the bridge area , with the ship - against - bridge probability as the output coefficient , the intelligent judging system of the ship - against - bridges probability reflecting the influence of the above input parameters is obtained after training 本文首次将人工神经网络系统方法引入了船撞桥概率的研究当中，编制了计算程序，成功地以现有12座典型桥梁的基础数据为样本，以桥梁跨径、水流流速、水流方向与桥轴法线的夹角以及桥区航道弯曲度等4个船撞桥主要影响因素为输入参数，以船撞桥概率为输出参数，经训练得到了能较好地反映上述输入参数影响的船撞桥概率判断系统。
