About: http://webisa.webdatacommons.org/422091439

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	A second aspect of the present invention is a system for determining a halftone frequency of a pixel of image data in a window of pixels.
http://www.w3.org/ns/prov#wasQuotedFrom	google.co.uk