| http://www.w3.org/ns/prov#value | - The weight may be based on the local standard-deviation computed on the XGA intensity image over a squared neighborhood (e.g. 16???16 for large-size skin areas, or 8???8 for medium-sized skin areas), but may also take into account other factors (e.g., the skin level of confidence, the proximity of the pixel to face features, such as eyes and mouth etc.)
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