Volume 41 Issue 3
May  2021
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BAO Lili, CAI Yanxia, LIN Ruilin, LIU Siqing, SHI Liqin, CAO Yong. A Weight Based Hierarchical Vector Quantization Algorithm for Space Environment Volume Data[J]. Chinese Journal of Space Science, 2021, 41(3): 425-430. doi: 10.11728/cjss2021.03.425
Citation: BAO Lili, CAI Yanxia, LIN Ruilin, LIU Siqing, SHI Liqin, CAO Yong. A Weight Based Hierarchical Vector Quantization Algorithm for Space Environment Volume Data[J]. Chinese Journal of Space Science, 2021, 41(3): 425-430. doi: 10.11728/cjss2021.03.425

A Weight Based Hierarchical Vector Quantization Algorithm for Space Environment Volume Data

doi: 10.11728/cjss2021.03.425
  • Received Date: 2019-12-12
  • Rev Recd Date: 2020-08-24
  • Publish Date: 2021-05-15
  • Visualization has been widely applied in space environment domain. However, compressed volume rendering algorithms based on VQ are concerned on fidelity and compression rate, not combined with specific application. To fulfill the specific visualization requirements for space environment volume data, an application-driven compression and rendering algorithm is proposed, which is Weight Based Hierarchical Vector Quantization (WHVQ). The volume data is initially partitioned into disjoint 43 blocks. Weights are assigned to the blocks according to their importance. The blocks are then decomposed into a three level hierarchical representation and each block is represented by a mean value and two detail vectors. To the top two levels, a splitting based on principal component analysis and weight is adopted to form their initial codebooks. Then, LBG algorithm based on weight is conducted for codebook refinement and quantization. The experimental results show that WHVQ is able to improve the quality of reconstruction in interested area on the premise of the good overall fidelity.

     

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