Research works in this paper are summarized as follows:Firstly, we propose a background extraction and update method based on block features by improving an existing algorithm.

概括起来，本文的主要研究内容如下：首先，我们通过改进现有算法，提出了一种基于块特征的背景提取与更新方法。

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Research works in this paper are summarized as follows:Firstly, we propose a background extraction and update method based on block features by improving an existing algorithm.

概括起来，本文的主要研究内容如下：首先，我们通过改进现有算法，提出了一种基于块特征的背景提取与更新方法。

youdao