摘要
随着获取设备的发展,大尺度、高分辨率数字图像已逐步进入人们的生活,大尺度图像的梯度域编辑显得更为重要,求解大规模未知数的泊松方程是大尺度图像梯度域编辑的关键。传统多重网格算法的迭代、约束和插值操作单独进行,内存和外存间通讯量大,算法效率低,为此提出了一种面向大尺度图像梯度域编辑的并行多重网格求解泊松方程的算法。该算法利用多重网格的迭代、约束和插值过程的内存数据访问局部性和更新相关性,构造滑动工作窗口,使迭代、约束和插值操作并行运行,提高了多重网格算法求解泊松方程的计算效率。全景图拼接实验表明,所提算法的运行效率高于超松弛迭代、高斯塞德尔迭代和传统多重网格算法。
With the development of image acquisition technology,gigapixel images are being produced and emerged into the modern society, and how to efficiently compile these gigapixel images within gradient domain is the research focus of image processing and computer graphics. To solve the Poisson PDE with large-scale unknowns is crucial to gigapixel image editing in gradient domain. Traditional multigrid approach separately performs iteration, restriction and prolonga- tion, bears heavy communication load between RAM and external memory. In the paper, a parallel multigrid approach for solving poisson PDE was proposed, which exploits the locality and relevance of memory accessing and updating a- mong the different stages to parallelly perform the iteration, restriction and prolongation in the sweeping window. Ex- periments of image stitching show that the presented method has the higher efficiency than the algorithms of successive over-relaxation,gauss-seider iteration and traditional multigrid.
出处
《计算机科学》
CSCD
北大核心
2013年第3期59-61,67,共4页
Computer Science
基金
国家自然科学基金项目(61073098)
教育部高等学校博士点基金(20113221120003)
江苏省六大人才高峰基金(2012-WLW-023)
江苏省自然科学基金(BK2009081)
江苏省科技支撑计划项目(SBE201077457)
江苏省高校自然科学基金(09KJB520006
11KJD520007)
南京大学软件新技术国家重点实验室开放基金(KFKT2008B15)
东南大学计算机网络和信息集成教育部重点实验室(K93-9-2010-04)资助