Title:   Edge-Forming Methods for Image Zooming: Color Images
Authors: Youngjoon Cha and Seongjai Kim

Abstract:
This article introduces edge-forming schemes for image zooming of color
images by general magnification factors.
In order to remove/reduce artifacts arising in image interpolation such
as image blur and the checkerboard effect, an edge-forming method is
suggested to be applied as a post-process of standard interpolation
methods.
The method is based on non-convex nonlinear partial differential
equations.
The equations are carefully discretized, incorporating numerical
schemes of anisotropic diffusion, to be able to form reliable edges
satisfactorily.
The alternating direction implicit (ADI) method is employed for an
efficient simulation of the model.
It has been numerically verified that the resulting algorithm can form
clear edges in 2-3 ADI iterations.
Various results are given to show effectiveness and reliability of the
algorithm.