The existing face detection methods can be classified into four categories: Knowledge-based methods, Feature invariant approaches, Template matching methods and Appearance-based methods.

现有的静止图像人脸检测算法主要有四类：基于知识的方法、基于特征不变量的方法、基于模板匹配的方法和基于表象的方法。

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You control the appearance of the site-specific information based on the value of the engine element.

我们将根据引擎元素的值控制站点特定信息的外观。

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Artists and urban anthropologists began to note the appearance of mall-based tribes.

艺术家和城市人类学家开始关注一类围绕商城生活的族群的出现。

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But Webster has now agreed a year-long deal with an appearance-based option to extend it by a further 12 months.

BBC: Burton Albion defender Aaron Webster signs new contract

Incremental contracts are appearance-based deals.

BBC: Injured Graham Onions loses England central contract

If you're lucky, Dan Hawkins may even make an appearance on your record, with Norfolk-based act Magnet Man already receiving the pleasure of the renowned guitarist walking in on his session.

BBC: Leeders Farm provides new studio for Norfolk bands