利用边缘移动匹配法减少龟纹的重采样算法

Image Resampling for Moiré Suppression Based on Edge-shifted Matching Method

提出了一种减少印刷中龟纹现象的重采样算法 .采用传统网目铜版方式的印刷工艺需要将一幅原始的数字图像重采样到输出栅格 .经典的重采样方法利用一些简单的插值方法计算新采样点的值 ,这些简单的插值法常会导致图像的高频部分出现龟纹 .提出的算法首先对原图像边缘部分的像素点利用边缘移动匹配法寻找边缘方向 ,再沿边缘方向计算新采样点的值 .模拟实验证明 ,和经典的重采样方法相比 。

A resampling method for moieé suppression is presented.Printing techniques using classical halftoning need to resample the original image on the screen lattice.Current resampling techniques computer new samples by simple interpolation methods like bilinear interpolation which can cause undesirable moiré artifacts when the original image contains high frequency components.In order to achieve high performance the orientation of edges is identified precisely by using edge-shifted matching method.Based on this method,the resampling along the edge orientation can be made to get the new samples.Simulation results show that the proposed algorithm can prevent moiré while preserve the edge integrity.