关键词: 交通事故现场摄影测量, 棋盘格, 角点提取, 相机标定

Abstract: Based on analysis of the properties of traffic accident scene，a new method of camera calibration using X-corners patterns is proposed.After several photos are obtained from different views，on the basis of the Tsai，camera is calibrated according to linear model，then its nonlinear parameters are modified based on the maximum likelihood criterion，at last the image is emendated according to new parameters.The final parameters of the model are achieved，and the experiment results demonstrate the proposed method is not only simple and accurate，but also flexible.

Key words: traffic accident scene photogrammetry, X-corners, corner detecting, camera calibration