【摘要】 对交通事故现场进行俯视拍摄可以记录现场俯视平面信息,摄影图像会产生几何畸变,影响信息的正确表达。需要对事故现场俯视摄影图像进行几何校正。在应用控制点图像坐标自动获取技术的基础上,提出了包括几何校正坐标变换数学模型的确立、控制点实际坐标的获取、控制点图像坐标的获取、图像配准和像素点灰度值确定的几何校正方法,并探讨了校正图像的彩色处理;采用最近邻灰度插值算法提高了图像处理效率。更多还原

【Abstract】 The plane information of bird’s-eye view is recorded by the bird’s-eye-photo of traffic accident scene. The geometric distortion is a problem in photograph images. Therefore the accurate expression of information is affected. The geometry correction must be accomplished for the bird’s-eye-photo of traffic accident scene. The method of geometry correction is proposed on the basic of automatic image coordinate acquisition for control point. The method comprises of the establishment of coordinate transformation model for geometry correction, the actual coordinate acquisition for control point and the image coordinate acquisition for control point and the image registration and the gray value identification of pixel. The image color procession is discussed after the geometric distortion is accomplished. The image processing efficiency is improved by means of the nearest point method for gray-level interpolation. Then the method is validated by exemplification.更多还原