About: http://webisa.webdatacommons.org/113329159

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	When the outputs of these units are subtracted one from the other the result is a signal corrected for systematic error in that error due to horizontal error or camera-induced blur is subtracted out.
http://www.w3.org/ns/prov#wasQuotedFrom	google.fr