一种快速的扫描铅笔稿图细化算法

二维动画计算机输助制作系统中,在对扫描铅笔稿图进行矢量化后,可以大大提高描线上色的效率,并且能够提取线条和闭包,对便于自动上色和中间帧生成等更高级功能的实现。扫描铅笔搞图的细化是矢量化的第一步,在比较了大量现存的图象细化算法后,提出了一种非迭代线跟踪细化算法,该算法效率较高,只需对图象进行一遍扫描加两遍轮廓跟踪,就能较好地满足二维动画计算机辅助制作系统对细化效率的要求。该文还对算法的时间复杂性进行     

基于MAPGIS的等高线矢量化研究

论述了基于MAPGIS平台的等高线矢量化方法,并对矢量化过程中出现的彩色地形图、等高线与图廓相交、断线及等高线方向不清等问题作了适当的方法论述.     

程序自动并行化系统

有效的自动并行化系统能帮助用户充分地利用并行计算机资源．本文介绍了自动并行化的历史及现状，并着重介绍了作者所开发的自动并行化系统ＡＦＴ（ａｕｔｏｍａｔｉｃＦｏｒｔｒａｎｔｒａｎｓｆｏｒｍｅｒ）及其特色和所用的关键技术．测试结果表明ＡＦＴ系统在功能上已超越了传统的自动并行化系统．     

Vectorizing NURBS surface evaluation with basis functions in power basis

Several known methods for direct evaluation of NURBS curves and surfaces are described. Runtime performance and simplicity of vectorization are discussed. An evaluation method, which uses basis functions precomputed in shifted power basis, is shown to be promising. This method for surfaces is vectorized with SSE2 intrinsics, yielding 3 times performance improvement over the non-vectorized version. Branchless vectorized linear search is proposed for span search, being most efficient for small number of knots. Binary search ending with a small linear search is shown to be most efficient for large number of knots, and good for general case. Performance comparison of the evaluation method and its equivalents from available geometric kernels is included.     

用于地图图像分色的像素边缘梯度算法

该文在分析地图图像特点的基础上,提出了一种适于地图分色的像素边缘梯度算法,其思想是将像素梯度的概念延伸到像素边缘的梯度。进而,利用数学形态学的变换原理,探讨了对分色结果进行后处理以及细化的具体过程。棕版图的实验结果证明,用此算法提取线状信息定位精度高,连续性好,处理速度快,并可以很好地解决粘连及背景噪声等问题,细化后的结果能够满足需要。     

Shadow allometry: Estimating tree structural parameters using hyperspatial image analysis

We present a novel approach to generating regional scale aboveground biomass estimates for tree species of the Lake Tahoe Basin using hyperspatial (< 1 m² ground resolution) remote sensing imagery. Tree crown shadows were identified and delineated as individual polygons. The area of shadowed vegetation for each tree was related to two tree structural parameters, diameter-at-breast height (DBH) and crown area. We found we could detect DBH and crown area with reasonable accuracy (field measured to image derived cross correlation results were 0.67 and 0.77 for DBH and crown area, respectively). Furthermore, the counts of the delineated polygons in a region generated overstory stem densities validated to manually photointerpreted stem densities (photointerpreted vs. image-derived stem densities correlation was 0.87). We demonstrate with accurate classification maps and allometric equations relating DBH or crown area to biomass, that these crown-level parameters can be used to generate regional scale biomass estimates without the signal saturation common to coarse-scale optical and RADAR sensors.     

基于AutoCAD二次开发的矢量化技术研究

 摘 要：分析传统矢量化方法中存在的问题,根据图像特点,先提取图像边缘数据,再进行数据的序列化操作,采用分而治之的方法,对图像信息分类逐步矢量化。设计算法通过Visual Basic和Visual Lisp编程,研制出矢量化实验平台,并通过实验比较分析矢量化效果,从而验证算法的有效性,最后提出了一种有序图形矢量化新方法。     

基于Canny优化的卡通视频分割与矢量化

矢量化的视频图像相对于光栅化的视频图像具有储存容量小、缩放不失真等诸多优点。相对于真实视频,卡通视频因色块明显、线条清晰等特点更适合于进行矢量化处理。基于卡通的特性提出了一种基于Canny边缘检测的优化分割算法。主要针对Canny边缘提取不封闭的特点进行优化,并将其用于图像分割。提出了一种算法来提取卡通动画的素材,并为卡通动画构建素材库。通过素材重用的方式大大地缩小了卡通视频的储存空间,并且很好地解决了卡通视频矢量化问题中极易产生的帧间不一致的问题。实现了一个全自动地进行卡通视频矢量化的系统,其中包括卡通视频的镜头分割、素材库的构建等过程。该系统能够适应多种卡通视频,并能对视频中的细节区域产生较好的效果。     

基于ICT图像矢量化处理的研究

论述了基于ICT图像进行矢量化处理的重要性矢量化处理的定义和基本过程，针对其中轮廓提取进行了详细的分析，包括边缘检测、轮廓跟踪、坐标标定和数据优化等内容。