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A study on local photometric models and their application to robust tracking

Michèle Gouiffès 1, * Christophe Collewet 2 Christine Fernandez-Maloigne 3 A. Trémeau 4
* Corresponding author
2 FLUMINANCE - Fluid Flow Analysis, Description and Control from Image Sequences
CEMAGREF - Centre national du machinisme agricole, du génie rural, des eaux et forêts, Inria Rennes – Bretagne Atlantique
3 XLIM-SIC - SIC
Université de Poitiers, XLIM - XLIM
Abstract : Since modeling reflections in image processing is a difficult task, most com- puter vision algorithms assume that objects are Lambertian and that no lighting change occurs. Some photometric models can partly answer this issue by assuming that the lighting changes are the same at each point of a small window of interest. Through a study based on specular reflection models, we explicit the assumptions on which these models are implicitly based and the situations in which they could fail. This paper proposes two photometric models, which compensate for spec- ular highlights and lighting variations. They assume that photometric changes vary smoothly on the window of interest. Contrary to classical models, the characteristics of the object surface and the lighting changes can vary in the area being observed. First, we study the validity of these models with re- spect to the acquisition setup: relative locations between the light source, the sensor and the object as well as the roughness of the surface. Then, these models are used to improve feature points tracking by simultaneously estimating the photometric and geometric changes. The proposed methods are compared to well-known tracking methods robust to affine photometric changes. Experimental results on specular objects demonstrate the robust- ness of our approaches to specular highlights and lighting changes.
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Michèle Gouiffès, Christophe Collewet, Christine Fernandez-Maloigne, A. Trémeau. A study on local photometric models and their application to robust tracking. Computer Vision and Image Understanding, Elsevier, 2012, 116 (8), pp.896-907. ⟨10.1016/j.cviu.2012.04.002⟩. ⟨hal-00726513⟩

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