### Summary

This paper surveys a variety of methods for performing image morphing. Image morphing is the process of generating an animation that transitions between two images. In addition to blending between the colors, image morphing involves interpolating shapes and contours in the image. This paper discusses several methods for performing this transformation including mesh warping, field morphing, radial basis functions, and multilevel free-form definition.

He discusses two main difficulties in image morphing: how to identify corresponding features in images, and how to perform the actual warp. The aforementioned methods all deal with how to perform the warp, but all vary in how an artist must identify features. The simplest method, mesh warping, requires the user to specify only points. This can make achieving the desired morph tedious. Other methods, such as multilevel free-form definition allow the user to specify curves and lines, which prove to be a much more intuitive interface.