基于区域边界的图像变形算法.pdfVIP

系 统 仿 真 学 报 Vol. 15 No. 7 • 976 • JOURNAL OF SYSTEM SIMULATION July 2003 基于区域边界的图像变形算法 偶春生，张佑生，高月芳 (合肥工业大学计算机科学与技术系, 合肥 230009) 摘 要：基于区域边界的图像变形算法使用不同类型的区域划分图像，在区域内建立仅与该区域边 界相关的扭曲函数，使区域内象素的扭曲局部化，同时又保证区域间扭曲函数的连续性，从而克服 了基于特征线段、基于网格扭曲等方法的缺点。本文详细讨论了区域的划分类型和方法，给出了区 域的扭曲函数，最后对复杂的人脸图像进行了实验。实验结果表明，该算法所需用户控制少，方便 用户对渐变精细度的控制，运算速度快，能产生理想的平滑渐变效果。 关键词：渐变；线性插值；映射；扭曲函数 文章编号：1004-731X (2003) 07-0976-04 中图分类号：TP391 文献标识码：A An Image Morphing Algorithm Based on Boundaries of Region OU Chun-sheng ，ZHANG You-sheng ，GAO Yue-fang (Department of Computer Science and Technology, Hefei University of Technology, Hefei 230009, China) Abstract: This paper presents an image morphing algorithm based on boundaries of region. By dividing the whole image region into some sub-regions and constructing warp function in each region, the algorithm localizes the warp function and the warp functions in different regions possess continuity on the boundaries of neighboring regions. This algorithm gets rid of some disadvantages appeared in Beier and Neely’s method and mesh-based method. This paper discusses the methods of region-dividing and constructs warp functions for different type of regions. By morphing a face image, the algorithm is proved to be efficient. Keywords: morphing; linear interpolation; mapping; warp function 样条[6][7]、能量最小[8]、多层次自由变形 [9]及不同拓扑结 引 言1 构间的变形技术[10][11]等。 图像渐变（Image Morphing）指把源图像以一种自然流 实际应用中，基于网格扭曲[3]、基于特征线段[4]是较 畅的、戏剧性的、超现实的