About: http://webisa.webdatacommons.org/301698695

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	Camera-based touch systems that use optical recording devices such as cameras to acquire images of a touch surface and process the image data to determine the position of a pointer relative to the touch surface are known.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com