射影坐標 的英文怎麼說
中文拼音 [shèyǐngzuòbiāo]
射影坐標
英文
projection coordinates-
In this paper, a new technique is proposed for rotation, scaling and translation invariant image watermarking based on log - polar mappings and phase - only filtering
該文的研究工作和貢獻是：基於對數極坐標仿射lpm和相位濾波器pof ，提出了一種不受旋轉按比例縮放和位移rst影響的數字圖像水印技術。At the beginning, the basic theory of plane measurement ? some basic elements in planar projective geometry, including 2d protective plane, homogeneous coordinates and homography are introduced. the pinhole camera model and the basic algorithm of image measurement are discussed
首先介紹了平面測量問題的理論基礎? ?平面射影幾何的一些基本元素：射影平面，齊次坐標，平面單應等，接著討論了攝象機針孔模型以及基於圖象的平面測量基本原理。Directly painting textures on top of 3d objects in 3d perspective viewport is a new issue of human - computer interface ( hci ). this paper presents a method to solve this issue. it converts the position information of the texture pixels of texture map into color information ， and then transfers both the coordinates and the color of texture pixels into screen through texture mapping at the same time. only is the color information of texture pixels converted into illumination by calculating the normal and the angle of ray incidence of the screen pixel in the method. the texture coordinates are firstly converted into the color information by generating another texture map ， which is called information map whose pixels ' color represents the coordinates information. and then the corresponding texture coordinates are mapped into screen reference frame by texture mapping and stored into information buffer for later use. so we can obtain the texture coordinates of screen pixels correspondingly by decoding from information buffer. after optimizing ， we can paint textures on top of 3d objects in 3d perspective viewport in real time. the paper also gives some examples and related definitions of using additional information of 2d texture map for 3d graph generating
針對三維逶視投影視圖中對三維物體表面紋理直接進行噴繪，以獲得復雜紋理圖這一計算機圖形交互技術這一新問題，研究了一種將紋理圖的象素位置信息轉換成彩色信息，然後利用紋理映射將紋理坐標連同該點上的顏色值一起傳遞到與屏幕象素對應的可見點上的方法，其中顏色值依該點處的入射光線方向和表面法向被進一步轉換為光強值，而紋理坐標則被解碼后還原成與該可見點對應的紋理坐標，被存入信息緩沖器中，供以後使用，通過解碼，可根據屏幕點直接得到對應紋理象素點的坐標，經過演算法優化，實現了對三維物體表面紋理的實時噴繪；同時闡述了在三維圖象生成技術中使用附加紋理信息的應用實例以及相關定義The conformal microstrip antenna with some unique character has been applied in many fields, especialy on speedy objects. in this paper, an efficient fdtd algorithm is introduced to analyse the microstrip antenna. firstly, the fdtd formula in descartes coordinate system and in cylindrical coordinate system are obtained from the time _ dependent maxwell equations using the yee algorithm in a calculating region where the dielectric parameters are independent of time and space. the choice of the space discretization units and the time discretization interval are discussed which are decided by the accuracy and stability respectively. the shape and setup of the excitation source are discussed too. the excitation source is chosen to be gaussian pulse in shape. secondly, the mur ' s first - order and second - order boundary condition are deduced in cylindrical coordinate system. the methods of transforming radiation fields from near zone to far zone in the frequency domain and in the time domain are presented when fdtd is applied to analyse the characteristics of far zone. finally, three kinds of microstrip antennas are analysed. they are a slot antenna that lies on a plane ground of a microstrip, a slot antenna that lies on a cylindrical ground of a microstrip and a microstrip line _ fed aperture coupled stacked rectangular patch antenna in cylindrical coordinate system
本文從麥克斯韋旋度方程出發，建立了笛卡兒坐標下無源空間中均勻無耗媒質的fdtd基本方程和圓柱坐標下無源空間中均勻無耗媒質的fdtd基本方程，詳細討論了fdtd法計算中時間步長和空間步長的選取原則以及激勵源的類型和設置；推導了mur一階和二階邊界條件在圓柱坐標下的差分格式；給出了在用fdtd法計算天線的遠場輻射特性時必需採用的頻域和時域近場遠場變換技術；最後用fdtd法計算了平面微帶縫隙天線、柱面共形微帶縫隙天線和柱面共形微帶層疊天線的輸入阻抗和遠區輻射場，並分析了天線的一些參數的變化對天線輸入阻抗的影響，得出了一些有用的結論。According to flight dynamics, a particle model and an attitude model in launching coordinate system and in quasi missile body coordinate system are established, the influence imposed by constant wind, thrust bias of the motor and connection bias are analyzed
應用飛行動力學理論，建立了發射坐標系與準彈體系下助推段和分離過程質點運動和姿態動力學模型，分析常風干擾、發動機推力偏差和裝配誤差影響等。Taking account of the perturbation of the earth ’ s shape, the gravitation of the sun and the moon, the radiation pressure from the sun light and atmosphere drag, a precise orbital dynamic model of spacecraft is established in the equatorial geocentric inertial coordinate system ( j2000 )
考慮了地球形狀攝動、日-月引力攝動、太陽輻射壓力和大氣阻力因素對飛行器的影響，在地心赤道慣性坐標系下建立了精確的軌道動力學模型。On the basis of the discussion on 3d depth mapping technique using encoded structural light, we adopt a color - encoded technique, that is to say, projecting angle is encoded by light plane ' s color or wavelength
在討論編碼結構光三維深度映射技術的基礎上，採用顏色編碼技術，即利用光平面光線的顏色（波長）對投影角進行編碼。建立投影角與物點三維坐標間的數學模型。Generally, traditional hough transformation is used to detect the line or some special curves in the image space, and navigation parameters can only be obtained indirectly by finding the corresponding position in the navigation coordinate through the anti - perspective matrix
傳統的hough變換是在圖像空間中檢測直線或某種特定的曲線，然後在把直線通過透視投影關系矩陣映射到導航坐標系中間接地得出所需的導航參數。This paper studies the ground motion of a triangular hill and antiplane response of a dike with flexible soil - structure interface while impacted by sh waves. the methods of complex function and moving coordinate system as well as a simple model are used here
通過復變函數法和移動坐標法，分別求解了sh波入射時三角形凸起地形對地震動的影響和柔性基礎上三角形壩體結構的出平面反應。This paper is composed of two parts including 5 chapters. in the first part ( including chapter 2 ^ 3 ), this paper explains an improved geometry - model method to eliminating eclipse shadow, using satellite imaging theory and projection theory to convert plane rectangular coordinates into rectangular spherical coordinates. otherwise, through studying eclipse ' s shape and size, this paper uses a math - function - model to eliminating eclipse shadow
本文共有五章，主要內容分為兩部分；第一部分包括第二、三章的內容，利用可見光雲圖成像原理以及點的投影法，將平面雲圖投影到三維直角坐標的球面上，對用於雲圖陰影訂正的原幾何模型法加以改進，得到改進的幾何模型法，並進行日食陰影訂正實驗；本文還利用數學函數模型法，通過研究月球在地球表面投射陰影的形狀及其受影響程度，從另一方面進行可見光雲圖日食陰影的訂正實驗研究。To the display unit, the display volume, projection unit, and input device are studied and analysed. to the graphics engine, the working principle is studied, including conversion of coordinate systems, processing of the image data, the process of conversion matrix, voxel ordering, and some simple methods of graphics engine hardware
對于顯示單元，分別對顯示體，發射單元投影系統和輸入裝置進行了研究和分析;對于圖像引擎，分析其工作原理，包括坐標轉換，圖像引擎處理圖像數據的過程，推導了轉換矩陣的實現過程，提出了體素排序的方法，並對圖像引擎的硬體提出了簡單的設計方法。Therefore, in order to hit the target precisely, launching coordinates must be originally orientation, which will influence on hitting precision of missile crosswise direction
因此，要保證導彈準確地命中目標，必須對發射坐標系進行初始定位。而初始定位中導彈初始方位角的裝定將直接影響導彈橫向命中精度。分享友人