About: http://webisa.webdatacommons.org/452556713

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	This calibration could be performed manually by manually determining the four corners of the panel in the image, or automatically, by using such methods as edge detection.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com