Study On The Optical Flow And Application Research In The Passive Ranging System

With improvement of the technology, many new ideas including the image processing technology have been applied in the measurement and testing technology. This makes the optical measurement and testing technology to be improved in the various fields.The optical flow estimation algorithm is studied in this paper and is used to the passive ranging. The result of optical flow is given by the image processing of real target.First, the basic knowledge of passive ranging and active ranging is given and different methods are compared. The binocular passive ranging and Dynamic trigonometry ranging are modified and used in this paper. In the dynamic trigonometry ranging system the high accuracy PSD device is used to calculate the light projecting central point. Combined the results from the methods of optical flow and difference-feature, the expressions between the optical flow and the velocity of measured target is deduced.Hence, the basic image processing method is applied to real experimental result. Comparing the results from the threshold methods, edge detecting algorithm and difference-feature, the algorithm which is suitable to our project is chosen to estimate the motion state of the target. At last, the optical flow computation algorithms are deeply studied. The Prewiit and Hueckels arithmetic operators are modified to the 3D form. Then the 3D-algorithem is applied to compute the optical flow.