Non-negative lighting and specular object recognition

TitleNon-negative lighting and specular object recognition
Publication TypeConference Papers
Year of Publication2005
AuthorsShirdhonkar S, Jacobs DW
Conference NameComputer Vision, 2005. ICCV 2005. Tenth IEEE International Conference on
Date Published2005/10//
Keywordsand, distribution, eigenfunctions;image, eigenvalue, harmonic, Lambertian, lighting;nonnegative, lighting;semidefinite, matching;object, object, objects;Szego, optimization;incident, programming;specular, recognition;optimisation;, recognition;spherical, representation;eigenvalues, theorem;constrained

Recognition of specular objects is particularly difficult because their appearance is much more sensitive to lighting changes than that of Lambertian objects. We consider an approach in which we use a 3D model to deduce the lighting that best matches the model to the image. In this case, an important constraint is that incident lighting should be non-negative everywhere. In this paper, we propose a new method to enforce this constraint and explore its usefulness in specular object recognition, using the spherical harmonic representation of lighting. The method follows from a novel extension of Szego's eigenvalue distribution theorem to spherical harmonics, and uses semidefinite programming to perform a constrained optimization. The new method is faster as well as more accurate than previous methods. Experiments on both synthetic and real data indicate that the constraint can improve recognition of specular objects by better separating the correct and incorrect models