To bridge the performance gap between original probability data association （PDA） algorithm and the optimum maximum a posterior （MAP） algorithm for multi-input multi-output （MIMO） detection, a grouped PDA （GP-...To bridge the performance gap between original probability data association （PDA） algorithm and the optimum maximum a posterior （MAP） algorithm for multi-input multi-output （MIMO） detection, a grouped PDA （GP-PDA） detection algorithm is proposed. The proposed GP-PDA method divides all the transmit antennas into groups, and then updates the symbol probabilities group by group using PDA computations. In each group, joint a posterior probability （APP） is computed to obtain the APP of a single symbol in this group, like the MAP algorithm. Such new algorithm combines the characters of MAP and PDA. MAP and original PDA algorithm can be regarded as a special case of the proposed GP-PDA. Simulations show that the proposed GP-PDA provides a performance and complexity trade, off between original PDA and MAP algorithm.展开更多
In order to evaluate the health status of pigs in time,monitor accurately the disease dynamics of live pigs,and reduce the morbidity and mortality of pigs in the existing large-scale farming model,pig detection and tr...In order to evaluate the health status of pigs in time,monitor accurately the disease dynamics of live pigs,and reduce the morbidity and mortality of pigs in the existing large-scale farming model,pig detection and tracking technology based on machine vision are used to monitor the behavior of pigs.However,it is challenging to efficiently detect and track pigs with noise caused by occlusion and interaction between targets.In view of the actual breeding conditions of pigs and the limitations of existing behavior monitoring technology of an individual pig,this study proposed a method that used color feature,target centroid and the minimum circumscribed rectangle length-width ratio as the features to build a multi-target tracking algorithm,which based on joint probability data association and particle filter.Experimental results show the proposed algorithm can quickly and accurately track pigs in the video,and it is able to cope with partial occlusions and recover the tracks after temporary loss.展开更多
针对联合概率数据关联(JPDA,Joint Probabilistic Data Association)算法关联概率计算过于复杂,无法适应复杂电磁环境下多目标实时跟踪的需求,提出了一种改进的JPDA算法(MJPDA)。首先,考虑多重因素重新定义关联矩阵,并计算关联概率;其次...针对联合概率数据关联(JPDA,Joint Probabilistic Data Association)算法关联概率计算过于复杂,无法适应复杂电磁环境下多目标实时跟踪的需求,提出了一种改进的JPDA算法(MJPDA)。首先,考虑多重因素重新定义关联矩阵,并计算关联概率;其次,对密集杂波下公共量测的关联概率进行修正,引入马氏距离对公共量测进行二次加权,同时考虑公共与非公共量测数目的影响,最后计算修正关联概率。该算法规避了确认矩阵的拆分,有效解决了JPDA算法计算量随杂波密度增加呈指数级增长的问题。通过理论分析和蒙特卡罗仿真实验结果表明,在密集杂波环境下,改进算法具有良好的跟踪性能和较小的计算量,显著提升了算法的实时性。展开更多
基金Sponsored by the National Natural Science Foundation of China(60572120)
文摘To bridge the performance gap between original probability data association （PDA） algorithm and the optimum maximum a posterior （MAP） algorithm for multi-input multi-output （MIMO） detection, a grouped PDA （GP-PDA） detection algorithm is proposed. The proposed GP-PDA method divides all the transmit antennas into groups, and then updates the symbol probabilities group by group using PDA computations. In each group, joint a posterior probability （APP） is computed to obtain the APP of a single symbol in this group, like the MAP algorithm. Such new algorithm combines the characters of MAP and PDA. MAP and original PDA algorithm can be regarded as a special case of the proposed GP-PDA. Simulations show that the proposed GP-PDA provides a performance and complexity trade, off between original PDA and MAP algorithm.
基金This work was supported by the National High Technology Research and Development Program(863 Plan)(Grant No.2013AA102306).
文摘In order to evaluate the health status of pigs in time,monitor accurately the disease dynamics of live pigs,and reduce the morbidity and mortality of pigs in the existing large-scale farming model,pig detection and tracking technology based on machine vision are used to monitor the behavior of pigs.However,it is challenging to efficiently detect and track pigs with noise caused by occlusion and interaction between targets.In view of the actual breeding conditions of pigs and the limitations of existing behavior monitoring technology of an individual pig,this study proposed a method that used color feature,target centroid and the minimum circumscribed rectangle length-width ratio as the features to build a multi-target tracking algorithm,which based on joint probability data association and particle filter.Experimental results show the proposed algorithm can quickly and accurately track pigs in the video,and it is able to cope with partial occlusions and recover the tracks after temporary loss.
文摘针对联合概率数据关联(JPDA,Joint Probabilistic Data Association)算法关联概率计算过于复杂,无法适应复杂电磁环境下多目标实时跟踪的需求,提出了一种改进的JPDA算法(MJPDA)。首先,考虑多重因素重新定义关联矩阵,并计算关联概率;其次,对密集杂波下公共量测的关联概率进行修正,引入马氏距离对公共量测进行二次加权,同时考虑公共与非公共量测数目的影响,最后计算修正关联概率。该算法规避了确认矩阵的拆分,有效解决了JPDA算法计算量随杂波密度增加呈指数级增长的问题。通过理论分析和蒙特卡罗仿真实验结果表明,在密集杂波环境下,改进算法具有良好的跟踪性能和较小的计算量,显著提升了算法的实时性。
