We sample from parallel edges in equal distance , and we sample again from sample points set by slope and get fitting points set , then we use least square method to fit straight line with the fitting points set . the edges of paper currency image can be detected accurately and quickly by above method , and it is valid to some image with a certain defection 边缘检测采用了对平行边缘整体等间隔抽样,根据斜率对抽样点集进行再次抽样后得到拟和点集,用最小二乘法根据拟和点集拟和直线的方法,可以快速精确的检测到纸币边缘,并且能够处理边缘有一定程度残缺的纸币图像。
This paper first analyzes the characteristics on train working diagram of urban rail transit , on the basis of describing property on rail line of urban rail transit , this paper puts forward theory of two stations drawing and three stations drawing which taking the setting of vehicle depots as the core of the subject designs sequence and contrary advance calculating methods to calculate the train arrival and departure time at mediate station , and builds mathematic model on the train working diagram of urban rail transit taking same interval time of train traveling as the target function 摘要在对城市轨道交通线路属性进行数学描述的基础上，以车辆段设置地点为核心，提出两站图及三站图理论，设计分层顺序和反序推点算法计算列车在中间站的到发时刻，并以分时段列车等间隔运行为目标函数，构建城市轨道交通列车运行图通用数学模型。
