2Wakahara T, Yamamoto N, Ochi H. Image processing of dot- ted picture in the QR code of cellular phone [C] //Proceedings of the IEEE International Conference on P2P, Parallel, Grid, Cloud and Internet Computing, 2010: 454-458.
3Jin L H, Li D H. A switching vector median filter based on the CIELAB color space for color image restoration [J]. Signal Process, 2007, 87 (1): 1345 1354.
4Dore V, Cheriet M. Robust NL-means filter with optimal pi xelwise smoothing parameter for statistical image denosing [J]. IEEE Transactions on Signal Processing, 2009, 57 (5) : 1703-1716.