if (!faceCascade.load("haarcascade_frontalface_alt2.xml"))

这段代码是使用OpenCV库进行人脸检测的一部分。具体来说，这行代码的作用是尝试加载名为"haarcascade_frontalface_alt2.xml"的分类器文件，并通过返回的布尔值来判断加载是否成功。如果加载成功，则返回值为false，表示加载失败；如果加载失败，则返回值为true，表示加载成功。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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