Content based video retrieval is particularly challenging because the huge amount of data associated with videos complicates the extraction of salient information content descriptors. Commercials are a video category where large part of the content depends on low level perceptual features such as colors and color dynamics. These are related to the evolution - in terms of shrinking, growth and translation - of colored regions along consecutive frames. Each colored region, during its evolution, defines a 3D volume: a color flow. In this paper, a system is presented that supports description of color flows based on 3D wavelet decomposition and retrieval of commercials based on color flow similarity.
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