A Regularization Approach to Blind Deblurring and Denoising of QR   Barcodes
  QR bar codes are prototypical images for which part of the image is a priori known (required patterns). Open source bar code readers, such as ZBar, are readily available. We exploit both these facts to provide and assess purely regularization-based methods for blind deblurring of QR bar codes in the presence of noise. 
Yves van Gennip, Prashant Athavale, J\'er\^ome Gilles, Rustum Choksi
cs.CV math.NA