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来自级联分类器训练的 OpenCV 文档:
负样本取自任意图像。这些图像不得包含检测到的对象。[...] 描述的图像可能有不同的尺寸。但是每个图像应该(但不是必然)大于训练窗口大小,因为这些图像用于将负图像子采样到训练大小。