TUTCRIS - Tampereen teknillinen yliopisto


Adaptive sampling for compressed sensing based image compression



JulkaisuJournal of Visual Communication and Image Representation
DOI - pysyväislinkit
TilaJulkaistu - 1 heinäkuuta 2015
OKM-julkaisutyyppiA1 Alkuperäisartikkeli


The compressed sensing (CS) theory has been successfully applied to image compression in the past few years as most image signals are sparse in a certain domain. In this paper, we focus on how to improve the sampling efficiency for CS-based image compression by using our proposed adaptive sampling mechanism on the block-based CS (BCS), especially the reweighted one. To achieve this goal, two solutions are developed at the sampling side and reconstruction side, respectively. The proposed sampling mechanism allocates the CS-measurements to image blocks according to the statistical information of each block so as to sample the image more efficiently. A generic allocation algorithm is developed to help assign CS-measurements and several allocation factors derived in the transform domain are used to control the overall allocation in both solutions. Experimental results demonstrate that our adaptive sampling scheme offers a very significant quality improvement as compared with traditional non-adaptive ones.