A
road condition video camera demarcating method under the traffic monitoring condition includes the following demarcating steps: (1) visual model describing and relevant coordinate
system creating: according to the requirement of the
monitoring system performance, a classical Tsai transmission
projection model is used for reference, and according to the feature of the
road condition imaging, a new visual model is presented after conducting corresponding amendment on the classical Tsai transmission
projection model, and three kinds of coordinates are established. (2) demarcating the main point of a
video camera and the extension factor: the image monitoring light
stream is used as the demarcating basic element; by the extension movement of the
video camera, a
reference frame forecast image and the difference value of the light
stream field in a real
time frame sampling image are used as the restriction, a constraint equation is established by adopting the least square method, the main point coordinate of the video camera and the actual
magnification coefficient of the video camera can be distinguished by the powell direction family method. (3) Demarcated object selecting and parameter
linearity evaluating. (4) Accuracy making on the internal and external parameters of the video camera: according to all the angle points of the monitored image and the corresponding world coordinate point, the Levenberg-Marguardt optimization
algorithm is adopted to make accuracy on the video camera
model parameter, and then the video camera demarcating is finished.