About: http://webisa.webdatacommons.org/382963516

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	In this case, the difference in intensity between vertically adjacent pixels is calculated as shown in equation (8), where n is an integer, for example, may be set to 1 (n=1).
http://www.w3.org/ns/prov#wasQuotedFrom	google.ca