An Image Warping Method Based on Control Points and Its Applications
基于控制点的图象变形方法及其应用

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.