[2] TOMASI C, MANDUCHI R.Bilateral filtering for gray and color images［C］//The 6th International Conference on Computer Vision, IEEE, 1998:839-846.

[3] HE K, SUN J, TANG X.Guided image filtering［J］.IEEE Transactions on Pattern Analysis and Machine Intelligence, 2013, 35(6):1397-1409.

[4] FUSCO N, MOSCARIELLO G, SBORDONE C.A formula for the total variation of SBV functions［J］.Journal of Functional Analysis, 2016, 270(1):419-446.

[5] PARIS S, HASINOFF S W, KAUTZ J.Local Laplacian filters:edge-aware image processing with a Laplacian pyramid［J］.ACM Transactions on Graphics, 2011.doi: 10.1145/2010324.1964963.

[6] XU L, LU C, XU Y, et al. Image smoothing via L0 gradient minimization［C］//ACM Transactions on Graphics (TOG), 2011.doi: 10.1145/2070752.2024208.

[9] BUADES A, COLL B, MOREL J M.A non-local algorithm for image denoising［C］//IEEE Computer Society Confe-rence on Computer Vision and Pattern Recognition, 2005:60-65.

[10] FARBMAN Z, FATTAL R, LISCHINSKI D, et al. Edge-preserving decompositions for multi-scale tone and detail manipulation［C］//ACM Transactions on Graphics(TOG), 2008.doi:10.1145/1360612.1360666.