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Most texture compression schemes are not able to accurately represent the object edges, since the number of color candidates usually are not sufficient to reconstruct a smooth block. We propose a new hierarchical palette approach for the texture compression. The colors are chosen from palettes and sub-palettes in quad-tree without increasing bit rates. The experimental results show significant improvements...
Unique polarimetric information included in SAR data hasn't received deserved attention, especially in the retrieval of crops biophysical parameters. This paper finds that two polarimetric parameters, that is polarimetric scattering entropy (H) and mean scattering angle (α), have great potential in crops biophysical parameters retrieval. Polarimetric features extracted by eigenvector-based and model-based...
Based on the NCEP/NCAR reanalysis and the NOAA sea surface temperature (SST) data, the interannual variation of the cold surge over the northern South China Sea (NSCS) and the relationship between the cold surge over the NSCS and the SST in the equatorial central and eastern Pacific have been investigated. The results show that the occurrence frequency of the cold surge over NSCS has an interannual...
A responsive and effective humanitarian relief is needed when the disaster happens suddenly. However, there are many sophisticated reasons prevent the coordination with other relief organizations and then decrease the responsibility and efficiency of relief. Thus a hybrid facility location model with non-fixed levels, shortest-longest radiuses, limited capacities, least warehouses and hubs, and uneven...
The scale and distribution of electric multiple unit maintenance base are important to improve the efficiency and capacity of high-speed railway network, but it is less studied in previous papers. On the basis of studying foreign experiences of distribution of electric multiple unit maintenance base, and examination and repair method, the paper analyzes the characteristics and affecting factors of...
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