Football Players Classification in a Multi-camera Environment - Advanced Concepts for Intelligent Vision Systems - page 145

Fig. 1. Cameras' location around the pitch

Fig. 2. Snapshot of the six camera views after processing step

Transformed RGB histograms: each channel is normalized independently,

obtaining for each channel a distribution where μ =0and σ =1.

Note that the last two sets introduce partial independence from light conditions.
However, this is not sucient to overcome problems related to the use of different
sources: in presence of images coming from different cameras, usually the color
appearance of the same actor changes radically from one image to another one.
This happens also in presence of differently lighted regions in the same images
(players of the same team positioned in shadowed/sunny regions). For this reason
in the next section 4 we propose an approach to uniform color appearance in
different images coming from uncalibrated cameras.