About: http://webisa.webdatacommons.org/143149997

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 general, patterns present on the writing support, such as squares or lines, or even the shadows cast on the support can be eliminated by a separation of the background and the signal to be extracted.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com