抽取幾何體 的英文怎麼說
中文拼音 [chōuqǔjīhétǐ]
抽取幾何體
英文
extract geometry-
First, how to conduct sample and quantification of continuous time signal which is prior condition of sdr is explored in detail, and the comparison and analysis of some sample modes are given in which band pass signal sampling theorem is most important. second, multi - sample rate signal processing which is an important basis of sdr is studied. emphasis are put on decimation and interpolation those are the most fundamental process and the realization of decimation and interpolation filter
在基於中頻采樣的軟體無線電結構框架下，首先詳細探討了軟體無線電的前提條件，即如何對連續時間信號進行采樣量化，比較分析了幾種采樣的方式，其中最為重要的是帶通信號采樣定理；然後探討了軟體無線電的一個重要基礎，即多采樣率信號處理，重點討論其最基本的兩個過程抽取和內插以及抽取器和內插器的實現；接著介紹了結構簡單、適用於一級抽取的cic濾波器和適用於做2倍抽取的半帶濾波器；再次論文在總結了傳統的調制解調基礎上，結合軟體無線電器件的特點，系統的探討並實現了基於正交思想的am 、 fm 、 ask 、 fsk 、 bpsk 、 qpsk的正交調制解調演算法。Because 3d surface model contains huge number of triangles, a mesh simplification algorithm based on triangle edges shrinkages is presented in this paper to speed up the rendering in real time. in chapter four, the cutting of reconstructed 3d models is explored. in order to observe expediently the size and interspaces structure of inner tissues and avoid the discommodiousness of surface reconstruction, a simple cutting methods based on ray - casting algorithm is presented to get the inner images information
第三章主要對marchingcubes （ mc ）表面重建演算法進行描述， mc演算法是基於規則體數據抽取等值面的經典演算法，本文實現了這種等值面構建表面模型的演算法，並對其演算法的二義性進行了相應的處理；針對其重建速度較慢的問題，提出了體素間相關性處理的方法來加快重建速度；並對其生成的表面幾何模型所包含三角面片數量巨大的問題，提出一種快速有效的三角形邊收縮演算法進行網格簡化，提高了表面模型的繪制速度。
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