近光源光度立体三维重建误差分析

3D Reconstruction Error Analysis on Photometric Stereo with Nearby Light Sources

一般假设的平行光光源,即远光源模型,受安装空间的约束在现实世界中很难实现。针对这一问题,提出了近光源模型解决近光源大尺寸物体的三维重建。近光源模型是一种新型的光源位置假设,需要标定光源位置,计算目标物体每个点上的光线方向,这样即使当物体尺寸较大或距离光源较近时,近光源模型也是对光源较优的一种假设。通过分析上述两种光源模型对噪声、光源到目标物体距离等因素的敏感度,比较发现当光源距离物体较近或物体尺寸较大的情况下,近光源模型的重建结果优于远光源的重建结果。

Distant illumination model,assuming parallel light source,is generally difficult to implement in the real world,where the work-ing space is constrained. To deal with this problem,a nearby light model is proposed to solve the three-dimensional reconstruction of the large-size objects near the light source. A nearby light source model is a new light position assuming,which works with calibrated light source position,calculated light vector across whole target object,even when the object is larger or closer to the light sources,the nearby light source model is also a better assumption. By analyzing the sensitivity of above two model for noise and distance between light source and target object,found that the reconstruction result of nearby source model is better than that from distant source model when the light source is closer to object or the object is larger.