增强现实中的多层次遮挡算法  

Multi-layer Occlusion Algorithm in Augmented Reality System

作　　者：张金玲[1] 贾庆轩[1] 孙汉旭[1] 刘亚辉[1] 

机构地区：[1]北京邮电大学自动化学院,北京100876

出　　处：《湖南大学学报（自然科学版）》2009年第5期85-88,共4页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(60803103);国家863计划资助项目(2007AA01Z329)

摘　　要：提出了一种改进的基于几何立体匹配的遮挡检测算法来提高增强现实系统中虚实遮挡检测的实时性、精度和鲁棒性.通过立体图像对中虚实点的投影位置关系判断虚实点之间的遮挡关系,不需要进行深度计算,能够有效提高遮挡检测的速度;通过选择网格边界上特征明显的边点进行检测运算能够提高遮挡检测精度;根据显示状态的连续性,提出一种状态拟合模型来改善算法的鲁棒性.实验结果证明此遮挡算法可以实现虚实物体间快速、可靠的多层次遮挡检测.An improved occlusion detection algorithm based on geometry stereo matching was put forward to increase the occlusion detecting speed, the accuracy and the robustness in the augmented reality system. The occlusion relation was judged by the relation of virtual and real points＇ projection positions on the stereo images. By skipping the deepness calculation, a faster detecting speed was achieved. By selecting virtual edge points with obvious feature on mesh contour to do detecting computation, higher occlusion detecting accuracy was obtained. And according to the property that the display status is spatio- temporal piecewise - constant, a status combining model based on artificial neural network has been proposed to improve the robustness. Experiment results have proved that this algorithm can realize real-time, reliable and multi - layer occlusion detection in augmented reality system.

关 键 词：增强现实 遮挡检测 立体匹配 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]