基于三维纹理映射的地震数据可视化及立体显示方法的研究

【作者】 李娟；

【导师】 张二华；

【作者基本信息】 南京理工大学 ， 计算机应用技术， 2009， 硕士

【摘要】 科学计算可视化是指运用计算机图形学和图像处理技术,将科学试验中的数据转换为图像,并在屏幕上显示出来,然后进行交互处理的理论、方法和技术。三维地震数据的可视化技术已成为当今油气勘探开发的主要技术,大大提高了石油开采的效率和准确性。本文在论述了三维数据可视化原理的基础上,介绍了几种经典的直接体绘制算法,针对这些算法计算量大,绘制时间长的缺点,本文重点研究并实现了基于硬件的三维纹理映射的体绘制算法,该算法可以明显的提高体绘制的速度。在此基础上,实现了在虚拟现实环境下,可视化图像的立体显示。对于三维纹理映射体绘制算法,本文首先采用了基于直方图的转换函数,将数据体转换为三维纹理;然后动态生成与视线方向垂直的一组采样多边形;接着进行纹理映射;最后利用硬件实现重采样运算和具有不透明度的图象合成。本文在实现三维纹理映射算法的过程中,主要研究了两种算法:一种是基于RGBA的颜色模式;一种是基于颜色查找表模式。本文主要实现了第二种算法,并将两种算法的结果进行了对比分析。更多还原

【Abstract】 Visualization in Scientific Computing(Visc) is the techonology which uses computer graphics and image processing techonologies to change the datas generated by scientific experiments into the image on the computer screen, And then ,Users can be interactive with the images.The visualization technology of 3-D seismic data has become today’s major means of oil and gas exploration and development, it greatly improves the efficiency and accuracy of the oil exploration.Based on discussing the principles of the 3-D seismic data’s visualization , This article introduces several typical algorithms used in direct volume rendering. Because of the great amount of computation,these algorithms take a long time to finish it . So, we focus on the realization of a hardware-based volume rendering algorithm of three-dimensional texture mapping, which can greatly improve the speed of volume rendering. After that, we complete stereoscopic display in Virtual Reality Environment.For volume rendering of 3-D texture mapping algorithm, We use the histogram transfer function to change the 3-D seismic data into a 3-D texture; Then, The sampling polygons are dynamically generated, which are perpendicular to the line of sight; Next, We complete texture mapping; Finally,Use the hardware to achieve the Resampling and image blend with opacity.In this paper,we study on two kinds of algorithm: One is based on the RGBA color model; One is based on the color table model. We mainly achieves the second algorithm,and compare the results of the two different algorithms.更多还原