understanding Unveil.js code

understanding Unveil.js code

hey guys checkout this small plugin for unveil.js , its for lazy loading . 

link on github :  Github code

i don't quite understand 2 lines of code in this pluggin : 


line 44 and line 45(on the github repo)
  1.  loaded = inview.trigger("unveil");
  2.               images = images.not(loaded);
what are these two lines really doing in the context of this pluggin ?? 

js fiddle on how the pluggin functions , incase its useful : fiddle