Abstract:

To detect moving shadow in intelligent video surveillance system, a method using illumination invariants c1c2c3is presented. Firstly, the coordinate
systems are defined on the basis of c1c2c3ratios of foreground and b
ackground pixels at the same position. Secondly, the moving shadow detection can be treated as a classification problem of shadows and moving objects in abovementioned coordinate systems. An ellipsoid is further constructed according to the scattering feature of shadow pixels. All the pixels inside the ellipsoid are extracted as shadows. Finally, the postprocessing is performed by exploiting the geometrical property of shadows. Experiments show that the proposed algorithm is robust and effective in detecting shadows for a variety of scenes and moving objects; moreover, it is suited for varying illumination conditions.

Key words: pattern recognition, moving shadow detection, intelligent video surveillance