Taking the method of adaptive Gaussian mixture method can make model for background meanwhile it is a difficult point to maintain and update background model.

采用自适应高斯混合方法为背景建模的难点是对背景模型的维持与更新。

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Conversely, when you change the colors, background, or navigation, XML and XSL automatically update all your pages.

反过来，当您更改颜色、背景或导航时，XML和xsl会自动更新您的所有页面。

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Afterward, they gave the attendees time to update the About me and Background sections, tag themselves and the others attending the conference, and invite colleagues to their networks.

然后，他们给出席者时间更新about Me和Background部分，标记自己以及其他与会者，并邀请同事加入自己的网络。

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The GOP-controlled House Tuesday passed a measure that would help states update their background-check systems. ( Full story) The measure had moved quickly in the wake of the shootings, which have left nine people dead and two wounded.

CNN: Attacks puts fresh focus on gun control

You can get back to them quickly, and they update more rapidly than before, but they don't constantly update in the background.

WSJ: New iPhone Keeps Apple Top of Class

But the company has just released the background method for its news feed update.

FORBES: On News Feed, Facebook Shows Off A Bit of Petticoat