About: http://webisa.webdatacommons.org/283607935

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	Thus, the prior art indicates that the determination and extraction of relevant image points such as region points, the region center, or the boundary points has proved to be very difficult.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com