About: http://webisa.webdatacommons.org/31694267

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	According to the present invention, n images P1-Pn are received, wherein n is an integer no less than two, and either or both of color and brightness of the background are different for each of the n images.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com