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Evaluating the effect of diffuse light on photometric stereo reconstruction

机译：评估漫射光对光度立体重建的影响

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摘要

Photometric stereo surface reconstruction requires each input image to be associated with a particular 3D illumination vector. This signifies that the subject should be illuminated in turn by various directional illumination sources. In real life, this directionality may be reduced by ambient illumination, which is typically present as a diffuse component of the incident light. This work assesses the photometric stereo reconstruction quality for various ratios of ambient to directional illuminance and provides a reference for the robustness of photometric stereo with respect to that illuminance ratio. In our analysis, we focus on the face reconstruction application of photometric stereo, as faces are convex objects with rich surface variation, thus providing a suitable platform for photometric stereo reconstruction quality evaluation. Results demonstrate that photometric stereo renders realistic reconstructions of the given surface for ambient illuminance as high as nine times the illuminance of the directional light component.
机译：光度立体表面重建要求每个输入图像都与特定的3D照明矢量关联。这表示应该依次使用各种方向性照明源对对象进行照明。在现实生活中，可以通过环境照明来降低这种方向性，环境照明通常以入射光的散射分量的形式出现。这项工作评估了环境光与定向照度的各种比率的光度立体重建质量，并为光度立体相对于该照度比的鲁棒性提供了参考。在我们的分析中，我们将重点放在光度立体的人脸重建应用中，因为人脸是具有丰富表面变化的凸面对象，因此为光度立体重建质量评估提供了一个合适的平台。结果表明，光度立体可以对给定的表面进行逼真的重建，使环境照度达到定向光分量照度的九倍。

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