To fan - scanned projections , they are commonly rearranged into parallel projections , which , however , occupy a great deal of memory 對于扇束投影圖像重建情形,一般做法是將扇形投影重排成平行投影模式,為此需開辟大量內存來存放投影矩陣。
The 2d affine projection model is analyzed from geometrical relation of parallel projection , the conversion of projection , the foundation of strict mathematical model of 2d affine . the characteristics of 2d affine projection are illustrated by experiments 從平行投影的幾何關系分析、投影性質的轉換、嚴格仿射變換數學模型的建立等方面,深入研究了基于仿射變換的傳感器模型,給出了實驗結果和分析結論。
Thirdly , analyse stereoscopic hardware and software technologies . three kinds of methods : rotations with perspective projection , parallel projection and two centers of projection that are with their difference are reviewed . based this , we decide to use two centers of projection for computing the left eye and right eye views of stereo pair 然后分別分析了立體顯示硬件和軟件技術,介紹了計算立體顯示的三種算法:透視投影旋轉法、平行投影法和雙中心投影法,并分析它們的優缺點,由此決定使用雙中心投影法實現本課題的立體顯示。
The validity of the subsection simulation method is proved , in which postprocessing technology is widely used . the sixth , the static simulation is neces sarily to find out the dynamic system ' s initial state for dynamic simulation . the gun is looked upon as a hyper - equilibrium structure , and a so - called " parallel projection method " is brought forward for the gun ' s static simulation 提出了一種求解線性方程組的方法?平行投影法,針對adams對超靜定系統靜態分析不力的情況,研究了求解全炮靜態問題的途徑和方法,并應用平行投影法求解車體懸掛的初始平衡力,求得了較符合客觀事實的解,從而完成了火炮發射前的靜態分析。
In this paper , two novel algorithms of reconstructing high resolution images from both overlapped parallel projection data and overlapped fan beam projection data with low resolution are presented . one is called virtual detector algorithm , and the other is direct reconstruction algorithm . both of the algorithms with two forms for the parallel data and fan beam data respectively are developed based on the interpolative algebraic reconstruction techniques ( iart ) 本文在研究插值代數重建法( iart )的基礎上,根據特別設計的數據采集模式(平行相疊采樣和扇形相疊采樣) ,提出了由相疊低分辨數據重建高分辨圖像的兩個新算法,即虛擬探測器法和直接重建法。