【作者】 高月芳；

【导师】 张佑生；

【作者基本信息】 合肥工业大学 ， 计算机软件与理论， 2003， 硕士

【摘要】 绘制技术是将几何模型转变成我们视觉上清晰直观图像的手段，它的研究内容非常广泛。基于图像的造型和绘制技术由于对场景几何复杂度依赖性较小，且能在普通的硬件平台上实现复杂场景的实时绘制，因而成为当前图形学的一个新的研究热点，广泛应用于计算机可视化、计算机视觉、多媒体等领域。本文研究的内容属于IBR的范畴，主要集中研究如下三个方面：图像变形是计算机动画中常用的算法之一，运用这种技术对图像的形状和颜色进行插值可产生动态效果。本文在基于特征线段的图像变形算法的基础上提出了一种基于区域边界的图像变形算法。该方法使用不同类型的区域划分图像，在不同的区域内建立与该区域边界相关的扭曲函数，使区域内的扭曲函数局部化，同时又保证了区域间扭曲函数的连续性，从而克服了基于特征线段的图像变形的缺点，并能产生较好的平滑渐变效果。图像变形技术本质上是对三维进行模拟，对同一场景的两幅图像，它不能获得介于它们之间的物理意义上的图像。视图变形技术在原先纯粹的二维图像变形的基础上引入“视点”的概念，从而使得图像变形的含义从二维扩展到三维上。3D重建是指由两幅或多幅图像恢复物体几何信息的方法，其中的一个难点和关键部分就是如何实现点的立体匹配。论文对文[63]中所提出的算法进行了改进，提出一个新的抑制函数，取得较好效果。更多还原

【Abstract】 Rendering techniques are fundamental tool by which the geometric models are transformed into meaningful visual images. In recent years, image-based modeling and rendering technique becomes a new hot topic in computer graphics community since it is independent of the geometric complexity of scenes, and is applicable to the real-time display of complex scenes on popular hardware platforms. The research of the thesis belongs to the field of IBR. The thesis addresses the problem of rendering techniques from three aspects.Image morphing is one of the common algorithms in computer cartoon. By interpolating the shape and color of the images we can acquire the effect of morphing. We present an image morphing algorithm in this thesis based on boundaries of region. Dividing the whole image region into some sub-regions and constructing warp function in each region, the algorithm localizes the warp function and all warp functions possess continuity on the boundaries of neighboring regions. This algorithm gets rid of some disadvantages appeared in Beier and Neely’s method.Image morphing technique based on geometric image interpolation creates compelling visual effect. But it can not produce a sequence of physically valid in-between views of the same scene. Seitz describe a simple image rectification procedure which guarantees that interpolation does in fact produce valid views, under generic assumptions about visibility and the projection process.3D reconstruction is one of the most challenge problems in computer graphics. In the scheme of getting depth information and reconstructing scene, we present a new inhibition function based on Zitnick’s algorithm, and have gotten better result.更多还原