Radiosity algorithms serve as a tool to synthesize photorealistic images by calculating the energy exchange on surfaces in closed environments. The key idea to compute a solution of this global illumination problem is to subdivide every surface of a given 3-dimensional scene into planar polygons. Finite element methods can now be applied to accurately compute the propagation of energy in the sc...

A novel algorithm, based on Kalman filtering is presented for updating the background image within video sequences. Unlike existing implementations of the Kalman filter for this task, our algorithm is able to deal with both gradual and sudden global illumination changes. The basic idea is to measure global illumination change and to use it as an external control of the filter. This allows the s...

In this paper, we introduce a method for recovering an illumination distribution of a scene from image brightness inside shadows cast by an object of known shape in the scene. In a natural illumination condition, a scene includes both direct and indirect illumination distributed in a complex way, and it is often difficult to recover an illumination distribution from image brightness observed on...