1 February 2008 Face relighting based on virtual irradiance sphere and reflection coefficient
Author Affiliations +
Optical Engineering, 47(2), 027204 (2008). doi:10.1117/1.2857451
We present a novel method to estimate the light source direction and relight a face texture image of a single 3-D model under arbitrary unknown illumination conditions. We create a virtual irradiance sphere to detect the light source direction from a given illuminated texture image using both normal vector mapping and weighted bilinear interpolation. We then induce a relighting equation with estimated ambient and diffuse intensity. We provide the result of a series of experiments on light source estimation, relighting, and face recognition to show the efficiency and accuracy of the proposed method in restoring the shading and shadow areas of a face texture image. Our approach for face relighting can be used for illuminant-invariant face recognition applications.
Heechul Han, Kwanghoon Sohn, "Face relighting based on virtual irradiance sphere and reflection coefficient," Optical Engineering 47(2), 027204 (1 February 2008). http://dx.doi.org/10.1117/1.2857451

Light sources

Optical spheres

3D modeling

Facial recognition systems

3D image processing

Image restoration

Optical engineering

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