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Region-based Mixture of Gaussians modelling for foreground detection in dynamic scenes

机译:高斯建模的基于区域的混合,用于动态场景中的前景检测

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One of the most widely used techniques in computer vision for foreground detection is to model each background pixel as a Mixture of Gaussians (MoG). While this is effective for a static camera with a fixed or a slowly varying background, it fails to handle any fast, dynamic movement in the background. In this paper, we propose a generalised framework, called region-based MoG (RMoG), that takes into consideration neighbouring pixels while generating the model of the observed scene. The model equations are derived from expectation maximisation theory for batch mode, and stochastic approximation is used for online mode updates. We evaluate our region-based approach against ten sequences containing dynamic backgrounds, and show that the region-based approach provides a performance improvement over the traditional single pixel MoG. For feature and region sizes that are equal, the effect of increasing the learning rate is to reduce both true and false positives. Comparison with four state-of-the art approaches shows that RMoG outperforms the others in reducing false positives whilst still maintaining reasonable foreground definition. Lastly, using the ChangeDetection (CDNet 2014) benchmark, we evaluated RMoG against numerous surveillance scenes and found it to be amongst the leading performers for dynamic background scenes, whilst providing comparable performance for other commonly occurring surveillance scenes. (C) 2015 Elsevier Ltd. All rights reserved.
机译:在计算机视觉中用于前景检测的最广泛使用的技术之一是将每个背景像素建模为高斯混合(MoG)。虽然这对于背景固定或缓慢变化的静态相机很有效,但它无法处理背景中的任何快速动态运动。在本文中,我们提出了一个通用的框架,称为基于区域的MoG(RMoG),该框架在生成观察场景的模型时会考虑相邻像素。模型方程式是从批处理模式的期望最大化理论推导而来的,而随机近似则用于在线模式更新。我们针对包含动态背景的十个序列评估了我们的基于区域的方法,并表明基于区域的方法比传统的单像素MoG可以提供更好的性能。对于相等的特征和区域大小,提高学习率的作用是减少正确和错误肯定。与四种最新方法的比较表明,在降低假阳性率的同时仍保持合理的前景清晰度,RMoG优于其他方法。最后,我们使用ChangeDetection(CDNet 2014)基准,针对众多监视场景评估了RMoG,发现它是动态背景场景的领先执行者之一,同时可为其他常见监视场景提供可比的性能。 (C)2015 Elsevier Ltd.保留所有权利。

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