Geometry and Texture Synthesis

诸如距离扫描、静态摄影、视频和动作捕捉等数据捕获方法已经开始改变计算机图形建模、渲染和动画的执行方式。我们建议通过开发重用几何和图像的方法来扩大捕获数据在模型创建中的适用性。我们计划进行两个相关的研究方向。首先是改进纹理合成的方法。我们计划解决当前纹理合成方法的一些缺点，包括精细特征的丢失或错误配准，合成纹理缺乏变化，算法参数的调整以及缺乏用户控制。我们计划在这项工作中借鉴的两个想法是人类视觉感知的图像度量和合成图像质量的评估。令人惊讶的是，很少有人注意到这些关于纹理合成的问题。我们的第二个目标是适应纹理合成方法来创建3D几何。具体来说，我们计划解决创建高度场、位移图和任意3D体积几何的问题。将纹理合成思想扩展到3D中有许多挑战，所以我们计划以一种有条不紊的方式来处理这个日益困难的表示列表。当然，我们在纹理合成方面的工作将为几何合成工作提供很多信息。几何图形的重用应该允许用户创建带有用户指定的山脉、河流和丘陵位置的合成地形。自然侵蚀和其他特征将不会来自昂贵的模拟，而是来自实例的几何合成。地形数据的例子很容易从美国地质勘探局找到，其他数字几何图形可以通过距离扫描和合并技术捕获。

ABSTRACT0204355Greg TurkGA Tech Res Corp GITMethods of data capture such as range scanning, still photography, video and motion capture have begun to alter the manner in which computer graphics modelling, rendering and animation is performed. We propose to widen the applicability of captured data for model creation by develop-ing methods for re-use of geometry and images. We plan to pursue two related research directions. The first of these is to improve methods of performing texture synthesis. We plan to address a num-ber of the shortcomings of current texture synthesis methods, including the loss or mis-registration of fine features, the lack of variation in synthetic textures, the tuning of the parameters of the algo-rithms and the lack of user control. Two of the ideas that we plan to draw upon for this work are image metrics for human visual perception and the evaluation of the quality of synthesized images. Surprisingly little attention has been paid to these issues with regard to texture synthesis. Our second goal is the adaptation of texture synthesis methods to the creation of 3D geometry. Specifically, we plan to address the problems of creating height fields, displacement maps, andarbitrary 3D volumetric geometry. There are many challenges to extending texture synthesis ideasinto 3D, so we plan to approach this increasingly difficult list of representations in a methodicalfashion. Of course, our work in texture synthesis will inform much of the geometry synthesis work.Geometry re-use should allow a user to create synthetic terrain with the locations of mountains,rivers and hills specified by the user. Natural erosion and other characteristic features will come notfrom costly simulations, but from geometry synthesis from examples. Examples of terrain data areeasily found from the USGS, and other digital geometry can be captured through range scanningand merging techniques.