title: Blow-up: a free lunch?
abstract: We consider operations that change the size of images, either shrinks or blow-ups. Image processing offers numerous possibilities, put at everyone's disposal with such computer programs as Adobe Photoshop. We consider a different class of operations, aimed at immediate visual awareness, rather than pixel arrays. We demonstrate cases of blow-ups that do not sacrifice apparent resolution. This apparent information gain is due to "amodal occlusion."
authors.affiliation: Delft University of Technology, EEMCS, MMI, Mekelweg 4, NL-2628 CD Delft, The Netherlands; and University of Leuven (KU Leuven), Laboratory of Experimental Psychology, Tiensestraat 102, Box 3711, BE-3000 Leuven, Belgium; e-mail:  j.j.koenderink@tudelft.nl ;
authors.forename: Jan
authors.initials: J
authors.lastname: Koenderink
authors.forename: Whitman
authors.initials: W
authors.lastname: Richards
authors.forename: Andrea
authors.initials: A
authors.lastname: van Doorn
keywords: amodal occlusion; image structure; occlusion; visual awareness; visual grouping; visual space