title: Novel Near-Lossless Compression Algorithm for Medical Sequence Images with Adaptive Block-Based Spatial Prediction.
abstract: To address the low compression efficiency of lossless compression and the low image quality of general near-lossless compression, a novel near-lossless compression algorithm based on adaptive spatial prediction is proposed for medical sequence images for possible diagnostic use in this paper. The proposed method employs adaptive block size-based spatial prediction to predict blocks directly in the spatial domain and Lossless Hadamard Transform before quantization to improve the quality of reconstructed images. The block-based prediction breaks the pixel neighborhood constraint and takes full advantage of the local spatial correlations found in medical images. The adaptive block size guarantees a more rational division of images and the improved use of the local structure. The results indicate that the proposed algorithm can efficiently compress medical images and produces a better peak signal-to-noise ratio (PSNR) under the same pre-defined distortion than other near-lossless methods.
authors.affiliation: School of Physics and Technology, Wuhan University, Wuhan, Hubei, China, 430072.
authors.forename: Xiaoying
authors.initials: X
authors.lastname: Song
authors.affiliation: School of Physics and Technology, Wuhan University, Wuhan, Hubei, China, 430072. huangqj@whu.edu.cn.
authors.forename: Qijun
authors.initials: Q
authors.lastname: Huang
authors.affiliation: School of Physics and Technology, Wuhan University, Wuhan, Hubei, China, 430072.
authors.forename: Sheng
authors.initials: S
authors.lastname: Chang
authors.affiliation: School of Physics and Technology, Wuhan University, Wuhan, Hubei, China, 430072.
authors.forename: Jin
authors.initials: J
authors.lastname: He
authors.affiliation: School of Physics and Technology, Wuhan University, Wuhan, Hubei, China, 430072.
authors.forename: Hao
authors.initials: H
authors.lastname: Wang
mesh_terms: D000465:Algorithms; D044962:Data Compression; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000706:statistics & numerical data; D059629:Signal-To-Noise Ratio; D014057:Tomography, X-Ray Computed / Q000706:statistics & numerical data
keywords: Adaptive block size; Block searching; Lossless Hadamard transform; Near-lossless compression; Spatial prediction