About: http://webisa.webdatacommons.org/411188583

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	FIG. 4 shows a blank control image 210 in which the tonal values of pixels of the image change as a periodic function, such as a square wave, sine wave, triangle wave etc.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com.au