5/spl plusmn/2 eigenimages suffice: an empirical investigation of low-dimensional lighting models

Russell A. Epstein, Peter W. Hallinan, A. Yuille
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引用次数: 176

Abstract

Recently, P.W. Hallinan (1994) proposed a low dimensional lighting model for describing the variations in face images due to altering the lighting conditions. It was found that five eigenimages were sufficient to model these variations. This report shows that this model can be extended to other objects, in particular to those with diffuse specularities and shadows. We find that sharp specularities and shadows cannot be well represented by a low dimensional model. However, both effects can be adequately described as residuals to such a model. We can deal with occluders in a similar way. We conclude that low dimensional models, using 5±2 eigenimages, can be usefully extended to represent arbitrary lighting for many different objects. We discuss applications of these results to object recognition
5/spl + usmn/2个特征图像就足够了:低维光照模型的实证研究
最近,P.W. Hallinan(1994)提出了一种低维光照模型来描述由于光照条件改变而导致的人脸图像变化。结果发现,五个特征图像足以模拟这些变化。这个报告表明,这个模型可以扩展到其他对象,特别是那些漫射特性和阴影。我们发现尖锐的镜面和阴影不能被低维模型很好地表示。然而,这两种效应都可以被充分地描述为这种模型的残差。我们可以用类似的方法处理闭塞器。我们得出结论,使用5±2个特征图像的低维模型可以有效地扩展到表示许多不同物体的任意照明。我们讨论了这些结果在物体识别中的应用
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