Temporal upsampling of performance geometry using photometric alignment
ACM Transactions on Graphics (TOG)
Rapid acquisition of specular and diffuse normal maps from polarized spherical gradient illumination
EGSR'07 Proceedings of the 18th Eurographics conference on Rendering Techniques
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State-of-the-art photometric shape and reflectance analysis uses polarized spherical gradient illumination images captured in a light stage. The quality of the estimated surface geometry degrades with interreflection, rotationally asymmetric reflectance lobes and light discretisation. We show that introducing additional parameters to model distortions in the diffuse reflectance lobe results in an underdetermined linear system. Results from existing approaches can be refined to satisfy this system using quadratic programming. We also describe how robust shape recovery can be achieved using a minimal four image set.