About: http://webisa.webdatacommons.org/199744102

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	However, shadow region identification and segmentation is a difficult task and improperly identified shadows often interfere with machine vision tasks like object recognition and tracking.
http://www.w3.org/ns/prov#wasQuotedFrom	upenn.edu