It supposed that the circle of sliding surface run through the foot of slide . the factor of safety is transmitted to the function of x coordinate of the intersection point of the tangent at the scrap of the circle and x axis . so , the two - dimension area of searching is changed to one - dimension 该方法先固定潜在滑动圆弧的上、下边界点，利用滑弧后缘处的切线与x坐标轴交点的位置确定了滑弧的曲率，将二维搜索面域简化为一维搜索线域，搜索的上、下限有严格的界定，不存在漏点问题。
Methods : the anatomic relationship between the cross point ( a ) of the sigmoid and the transverse sinus and the asterion ( s ) , the cross point of the perpendicular and the horizontal ( b ) and point of the fissure of the occipital - mastoid at the fundus of the mastoid ( c ) were determined . then the length of a - s and b - c were measured . results : ( 1 ) the a point was lateral and inferior to the asterion , 10 . 8 + 1 . 1 mm on horizontal plane , 3 . 5 + 0 . 7mm on the longitude plane 方法：确定横窦和乙状窦的交界内下缘比点）和星点（枕乳缝和人字缝交叉点， s点）的解剖关系；乙状窦垂直部和水平部交汇处内下缘旧点）和枕乳缝乳突基底水平处点）的关系。测量as和b c点的距离。结果： l横窦和乙状窦交点的位于星点外下方，横断面上，平均距离为10
Firstly , a rapid and exact method of character recognizing based on image recognition and process theory is presented according to the characteristics of letters and arabic numerals . in this system the recognizing modes are few , but the high exactness and speed must be guaranteed 在解决纸币号码图像的识别过程中：首先从图像处理和识别理论出发，针对字符识别模式少、识别准确率高、识别时间短的特点，提出了一种以提取识别字符图像和直线交点的个数为特征，然后分类快速识别的识别方法。
The new line against polygon window clipping algorithm which makes full use of two judgement conditions to confirm noneffective intersections between the lines and the polygon edges can only calculate the effective intersections and increases the efficiency of the clipping . third , a new 3 - d clipping algorithm of line against spherical surface window is introduced for the first time 一般多边形窗口线裁剪的改进算法充分利用确定被裁线段与多边形边无交的两个判断条件，对完全不可见线段以及与被裁线段无有效交点的多边形边进行了排除，只有当线段与多边形边有有效交点时才求交，避免了不必要的求交，提高了算法效率。
