一种基于特征统计的动态伪装效果评估方法

现有的伪装效果评估主要针对静止的单幅图像，不能很好地模拟侦察人员对目标的判读过程。结合Mean shift目标跟踪技术，提出一种基于特征统计的动态伪装效果评估方法。该方法通过统计目标与背景8联通域的相关性特征数据，建立归一化联合高斯分布，利用概率密度的分布范围评估目标伪装效果。计算联合分布的概率密度时，提出对数放大概率，解决了高维联合分布概率密度数值敏感度低、不便于阈值设定的问题。引入样本更新策略，使样本库按照一定的概率随机更新，从而较好地适应了由于季节交替等因素引起的背景大范围变化。实验过程分别对某一指挥车实施1级伪装、2级伪装和3级伪装。采集数据后计算其对数放大概率并对曲线作出统计，结果表明：实际中划分的3种伪装状态与依据3σ准则预先设定的3种伪装状态完全对应；该模型能够有效反映出目标的伪装效果。

A Dynamic Camouflage Effect Evaluation Method Based on Feature Statistics

The existing camouflage effect evaluation is mainly for a single still image, which can not simulate the process of the reconnaissance personnel's interpretation of a target. A feature statistics-based dynamic camouflage effect evaluation method is proposed based on mean shift target tracking algorithm. The proposed method is to establish a normalized joint Gaussian distribution by using the data of correlation features between the target and the background of eight-way domain, and use the distribution range of probability density to evaluate the camouflage effect of target. A logarithmic amplification probability is proposed for calculating the probability density of joint distribution, which solves the problem that the high-dimensional joint distribution probability density has low numerical sensitivity and is inconvenient to set a threshold. At the same time, a sample update strategy is introduced to make the sample library update randomly according to a certain probability, so as to better adapt to the change in large-scale background caused by the turn of seasons and other factors. In the experimental process, the first-level, second-level and third-level camouflages are applied to a certain command vehicle. After collecting the data, the logarithmic amplification probability is calculated, and the statistics on the curves is made. The results show that 3 camouflages divided in reality completely correspond to the first-level，second-level and third-level camouflages pre-set by the 3σ criterion. The experimental results show that the model can effectively reflect the camouflage effect of target.