The quad - tree automatic simplification technique is used for that terrain in different " pyramid " levels takes on different resolution , and terrain in the same level has multi - resolution . in order to solve geometry - gaps , the author studies and compares two ways : pattern of restricted quad - tree and mark points and pattern of changing connectivity of vertices for higher resolution 考虑vrml特点,采用“金字塔”数据结构组织地形数据,通过基于四叉树的地形数据简化算法对地形数据进行简化,使“金字塔”的不同的层次间具有不同的分辨率,同一层次间也具有不同的分辨率。
The contribution of this dissertation : an image retrieval approach based on dct compressed domain is proposed . first , reorder dct coefficients using multiresolution wavelet transform , then build subband energy histograms formed from reordered dct coefficients of database images , build indices of images by using morton order and order database for indexing by using variant b - tree data structure 本论文的贡献:提出了一种将jpeg图象的dct系数按照多分辨率小波变换的形式进行重组,得到若干子带并建立子带能量直方图作为特征,在按照morton的顺序建立索引,并对索引采用变形b树数据结构组织,进行检索的方法。
组织: organization; organized syst ...柱状结构组织: columnar structure内数据结构: internal data structure树 (数据结构): tree (data structure)数据结构: data hierarchy; data organization; data structures; database structure数据结构化: data structuring数据结构机: data structure machine数据结构树: data-structure tree数据结构图: data structure diagram数据结构系: data structure set小数据结构: small data structures源数据结构: source data structure主数据结构: master data structure标准数据结构: canonical data structure表格数据结构: list data structure并行数据结构: parallel data structure层次数据结构: hierarchical data structure抽象数据结构: abstract data structure; abstractdatastructure; adt初始数据结构: primary data structure次级数据结构: secondary data structure地理数据结构: geographic data structure地图数据结构: madata structure; mapdatastructure弟归数据结构: recursive data structure递归数据结构: recursive data structure; recursive structure动态数据结构: dynamic data structure