| In our country,there are lots of traffic accident leading to heavy transaction and causation analysis work.At present ,the accident scene reconnaissance is mainly depended on manpower. Herein ,we bring forward a new method called digital phctogrammetric measurement for traffic accident scene.Firstly,a photogrammetric model named direct linear transform (for short DLT),which relate the world coordinate with image coordinate ,is presented. Secondlysome image processing technologies such as median filtering ,edge location ,hough transform ,connected-components labeling ,are discussed for obtaining precise image coordinate At last ,based on test result ,some exoteric factors effecting measurement precision including shooting angle,shooting distance ,shooting height,control points image coordinate error are described,and some improvements are advanced. |
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