QR codes at controllable level of readability. Our approach largely looses the binding between the QR code and halftone image, thus results in high quality visual QR codes which are resistant to the variation of QR codes.
Computer aided design of recreational arts has been extensively studied in various contexts including emerging images [Mitra et al. 2009], shadow art [Mitra and Pauly 2009], camouflage images [Chu et al. 2010], pixel art [Kopf and Lischinski 2011], etc. Further, collage art [Gal et al. 2007; Huang et al. 2011] and text art [Xu et al. 2010; Maharik et al. 2011] that aim at optimizing the assemblage to retain local element characteristics while approximating a global shape, are relevant to our work. However, instead of maintaining shape and identifiability of local elements, our goal is to retain readability
of the QR codes. This is a much stricter constraint.