关键词: 交通流, 线性回归, 三维散点图, 投影变换

Abstract: The previous researches mainly focused on traffic flow state recognition in advance (namely traffic flow forecasting) and realtime recognition (namely incident detection or traffic flow breakdown detection), but recognition of quantitative change rule of traffic flow was neglected in some degree. Based on the traffic flow theory and the elements of projective transform in descriptive geometry, the key to the changepoint recognition was analyzed by the complanation of dualistic linear regression. This method is calibrated and tested on the field data of a road to verify the validity and the feasibility of the theory.

Key words: traffic flow, linear regression, three-dimensional scatter plot, projective transform