Face relighting for normalization of directional lighting

Details Face relighting for normalization of directional lighting Face relighting for normalization of directional lighting

2008-01-29

2008-01-29

Bella, Matthew C. (Department: 2624)

Image analysis

Applications

3-d or stereo imaging analysis

C382S100000, C382S285000, C382S118000

Reexamination Certificate

active

11057828

ABSTRACT:
A method determines a direction of a principal light source in an image. An input image I is acquired of an object illuminated by a principal light source from an unknown direction. The input image includes an array of pixels, and each pixel has an intensity I(x, y). An intensity vector {right arrow over (I)} is constructed from the intensities of the input image. An albedo map ρ is defined for the object. An albedo vector {right arrow over (ρ)} is constructed from the albedo map. A shape matrix N is generated for the object. The albedo vector {right arrow over (ρ)} is multiplied by the shape matrix N to obtain a shape-albedo matrix A. Then, a direction s* to the principal light source is estimated from the intensity vector {right arrow over (I)}, the albedo vector {right arrow over (ρ)} and the shape-albedo matrix A according to an optimizations*=arg⁢⁢mins⁢I→-ρ→-As.

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