中提琴琼斯对象检测的阈值 [英] Threshold values for viola jones object detection

问题描述

我正在尝试执行Viola和Jones在他们关于快速物体检测的论文中所述的Adaboost培训。但是，我不了解如何获得将160k每个特征从非人脸分类的人脸阈值。这是您手动设置的阈值吗？还是基于某种数学？

有人可以向我解释一下数学吗？

撰写了有关ROC分析的出色介绍。 Shappire和Freund中介绍了完成所需功能的完整算法的书，第3.4.2节。

I am trying to perform Adaboost training stated by Viola and Jones in their paper on rapid object detection. However, I do not understand how to get the threshold values that will classify the faces from non faces for each of the 160k features. Is this a threshold you set manually? or is this based on some kind of maths ?

Can someone please explain the maths to me thanks a lot.

解决方案

IMO, the best way to describe what happens during threshold assignment of the weak classifiers in every boosting round is a ROC analysis of the weak classifier performance. A great introduction on ROC analysis was written by Tom Fawcett. The full algorithm that does what you want is described in Shappire and Freund`s book, section 3.4.2.

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