D. Munoz-Mejias Iván González-Díaz 0001 Fernando Díaz-de-María A low-complexity pre-processing system for restoring low-quality QR code images. 1320-1328 2011 57 IEEE Trans. Consumer Electron. 3 https://doi.org/10.1109/TCE.2011.6018890 db/journals/tce/tce57.html#Munoz-MejiasGD11