Volume rendering of irregular data field is a hot but knotty field in VISC recently.
非规则数据场的体绘制是可视化的一个热点和难点。
Volume rendering is often used for 3d volumetric datasets visualization. It can generate high quality images, but can not render volumes and polygons combined scenes.
体绘制技术常用于3维体数据场的可视化，其虽然可以生成高质量的投影图像，但通常不能绘制由体数据与点、线、面图形组成的混合场景。
The significance of medical images volume rendering is the high quality results, so the hot point and the aim is strike the right balance of the rendering results and the rendering time.
医学图像体绘制的意义在于高质量的绘制效果，所以体绘制的研究热点及目的在于在绘制质量和绘制速度之间寻求较好的平衡点。
The speed of volume rendering is the bottleneck of interactive visualization.
体数据的绘制速度是交互可视化的瓶颈。
During volume rendering, gradient will be used both on the procedure Classification and Shading. So rapidity and accuracy of gradient estimation is important to high quality rendering algorithm.
体绘制流程中，梯度在数据分类和明暗计算中都要用到，因此快速准确的梯度估算对高质量的体绘制算法至关重要。
Ray casting is a widely recognized method for high quality volume rendering.
光线投射是一种高质量的体绘制方法。
Volume rendering can be applied in many fields including medical science, meteorology and geological exploration.
体绘制的应用领域十分广泛，涵盖了医学、气象学和地质勘探等领域。
Objective To describe a spatial data structure called sorted volumetric data structure which speeds up the volume rendering and will not affect image quality.
本文提出一种称为有序体数据的空间数据结构，它可以有效地加速体绘制而对图像质量没有影响。
In order to display important organs outstandingly, a new approach for fast volume rendering algorithm based on mixed data sets was put forward.
为了突出人体重点器官的显示，提出了一种新颖的基于混合数据场的快速体绘制算法。
Gray scale image interpolation is a preprocessing step for volume rendering in medicine.
灰度图像插值是体绘制的预处理步骤。
Hardware accelerated volume rendering technique is the key point of this thesis.
基于硬件加速的体绘制技术是本文的研究重点。
An interactive volume rendering algorithm is presented which is based on a novel optical visualization model.
交互式体绘制算法基于一个新的可视化模型。
Volume rendering is also known as direct volume rendering, for no intermediate geometry primitives are generated during its visualization process.
由于体绘制技术是将三维的离散数据直接转换为二维图像而不必生成中间几何图元，所以又称为直接体绘制。
Then, the paper talked about the volume rendering technology, using GPU on that area, and set out the operation effect of the visualization software.
随后文章介绍了体绘制技术与GPU技术在这方面的应用，并展示了编写的显示端软件的执行效果。
The 2d medical image can be transformed into the 3d image by surface reconstruction and volume rendering.
通过表面重建和体绘制，可将医学二维图象转化为三维图象。
In this paper, an algorithm is proposed for the accelerated rendering of volume on linear octrees basis.
提出了基于线性八叉树的加速体绘制算法。
The surface rendering extracts isosurface from 3D volume data, and then uses traditional graphical technology to display.
面绘制从三维体数据中抽取物体等值面，通过传统的图形学进行显示；
By combining shadow map, shadow volume and ray marching techniques, a new hybrid method is proposed for rendering of volumetric shadows under participating media.
该算法将阴影图和阴影体算法相结合，先通过阴影图绘制出阴影的轮廓，再利用阴影体算法更新轮廓处象素的模板缓冲值。
Several key techniques are described including the representation and classification of volume data, typical algorithms of surface rendering, volume rendering and hybrid rendering.
对体视化的几种关键技术进行了分类综述，介绍了体数据的表示和分类，面绘制、体绘制和混合绘制各类典型算法的原理和特点。
The key techniques of the rendering of vector data over 3d terrain based on stencil shadow volume algorithm are detailed and the effectiveness of this method is test-proven.
详细论述了基于模板阴影体算法矢量数据绘制的关键技术，并通过试验验证了该方法的有效性。
Based on the introduction of common data models and rendering algorithms for volume data, this paper proposes a hybrid octree encoding to describe it.
在介绍当前体数据的数据模型与绘制方法的基础上，使用混合八叉树进行体数据的描述，实现了对其自适应分块存储。
The transepicondylar axis of different position has no effect on volume rendering technique measuring the humeral head retroversion angle with multi slice spiral CT.
肱骨远端不同位置内外上髁轴线对多层螺旋CT容积再现测量肱骨头扭转角没有影响；
An effective fast volume rendering algorithm is investigated.
研究有效的体绘制加速算法。
From now on, there are mainly two implementations of volume rendering, one is software implementation, the other is hardware implementation.
目前体绘制策略的实现主要有两种：软件实现和硬件实现。
The depiction of various structural relationships between objects in rendering space enhances the understanding of the data set, and extends roles of volume rendering in volume data analysis.
在绘制空间对物体之间的不同关系的描述增强了用户对体数据的理解，并拓展了体绘制在体数据分析中的功能。
Secondly, for large scale high dynamic range volume datasets, it is usually not so easy to achieve the desired rendering results by traditional transfer function methods.
其次，对于具有高动态范围的浮点型数据集，在体绘制过程中使用传统的传递函数设计方法很难达到理想的绘制效果。
The volume rendering method does shading processes to all of the volume data directly, maintains the details of the medical images, and achieves better render results.
其中的体绘制方法直接对所有的体数据进行处理，有利于保留三维医学图像的细节信息，具有较好的绘制效果。
Finally, the processed water and seafloor data is combined, and then the visualization of SAS volume data is achieved by the ray casting algorithm of direct volume rendering.
最后，将处理后的水体和地层数据合并，并通过直接体绘制中的光线投射算法有效地实现了水声体数据的三维可视化。
Algorithm research is main part of visualization research, the thesis refers to two kinds of algorithms for volume rendering: Fourier volume rendering and shear-warp volume rendering.
算法研究是可视化的主要研究领域，本文的研究涉及两类体绘制算法：频域体绘制和错切变形体绘制。
Methods in 13 cases, maxillofacial fractures were demonstrated with 3dct volume rendering.
方法对13例颌面复杂骨折患者，进行三维ct体积重建。
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