基于控制点的图象变形方法及其应用  

An Image Warping Method Based on Control Points and Its Applications

作　　者：杨金钟[1] 刘政凯[1] 俞能海[1] 吴皓[1] 

机构地区：[1]中国科学技术大学信息处理中心,合肥230027

出　　处：《中国图象图形学报（A辑）》2001年第11期1070-1074,共5页Journal of Image and Graphics

摘　　要：根据人脸 ,特别是根据人脸在人眼变形中对形状和细节的要求 ,提出了用光滑不等距插值和空间可变线性插值方法来实现基于控制点网格的数字图象变形的想法 .其中 ,光滑不等距插值用来实现图象的坐标变换 ,而空间可变线性插值则用来实现图象的灰度插值 .同时 ,可将变形过程中图象的坐标变换和灰度插值分开操作 ,用以取代原来行和列的分别变形操作 ,实验结果证明 ,用这种方法不仅能获得很好的变形效果 。This paper presents a method of implementing the digital image warping based on control points by combining smooth unequally spaced interpolation and space variant liner image interpolation method. The smooth unequally spaced interpolation is used to establish the locality relationship between the original and the warped image. It maps the coordinates in original image to corresponding position in warped image. The space variant liner image interpolation provides an efficient way to reconstruction an image. The image interpolation method has been proved simple with a good visual result. During the warping process the operation of image coordinates transformation and image interpolation are separated, which replaces the traditional warping operation by row and column gradually. This operation reduces the complexity and saves computing time. With the new method a good warping result has been acquired. This method has been applied to human eyes morphing operation and satisfied result has been achieved. According to the high requirements of keeping regular shape and edge information in eyes morphing, this image warping method proves applicable.

关 键 词：图象变形 控制点网格 光滑不等距插值 距离偏差 空间可变线性插值 人眼变形 人脸识别 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]