三角形坐标系下的图像拓扑变形插值算法

Jisuanji Fuzhu Sheji Yu Tuxingxue Xuebao/Journal of Computer-Aided Design and Computer Graphics(2013)

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Abstract
针对基于三角形坐标系的非线性拓扑变形过程中会产生像素点缺失的问题,提出一种定位插值算法.首先判断发生三角变形前的各像素点在图像中是否为有效点,并赋予其相应的参数,再在图像变形过程中对关联参数进行更新;其次针对新产生的空点位置,对其小邻域内的点集参数进行统计,并利用积分图像快速计算插值权重,权重大于设定阈值者即判定为待插值空点;最后进行三次卷积插值.通过在多三角形网格下进行表情设计、人脸过渡等实验的结果表明,该算法能够有效地解决三角形坐标系下拓扑变形的插值问题,明显地改善了图像的视觉效果.
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Key words
Image interpolation,Location of interpolative points,Topological deformation,Triangle coordinate system
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