Hybrid Adaptive Lossless Image Compression Based on Discrete Wavelet Transform.

ABSTRACT: A new hybrid transform for lossless image compression exploiting a discrete wavelet transform (DWT) and prediction is the main new contribution of this paper. Simple prediction is generally considered ineffective in conjunction with DWT but we applied it to subbands of DWT modified using reversible denoising and lifting steps (RDLSs) with step skipping. The new transform was constructed in an image-adaptive way using heuristics and entropy estimation. For a large and diverse test set consisting of 499 photographic and 247 non-photographic (screen content) images, we found that RDLS with step skipping allowed effectively combining DWT with prediction. Using prediction, we nearly doubled the JPEG 2000 compression ratio improvements that could be obtained using RDLS with step skipping. Becaus

SUBMITTER: Starosolski R 

PROVIDER: S-EPMC7517294 | biostudies-literature | 2020 Jul

REPOSITORIES: biostudies-literature