数字图像分形解码中方块效应的差值解决方法

对于分块式的图像压缩方法,在高压缩比下,都会产生明显的方块效应,分形编码方法也不例外。为了解决高压缩比下解压缩后图像的方块效应,本文采用了一种简单实用的解码方法,有效的减少了方块效应。其思想就是利用分形编码独有的分辨率无关性,解码步骤分为两步:第一步首先将图像解码到一个稍微低一点的分辨率上,然后结合传统的插值的方法,将图像还原到希望的高分辨率上,从而达到了减少方块效应的目的。这种方法的优点是不必对编码做任何改动,而且实现简单。

A Interpolation Solution to Reduce Blocking Artifacts Introduced by Fractal Image Coding Methods

At high compression rate all block-based image compression methods have a common defect,that is,tile effect.There is no exception for fractal image coding.So,we proposed a simple but effective method to reduce the tile effect.Firstly,we decode the image at lower resolution.Then,we employ the bilinear inter polation technique to reconstruct the image at the same resolution. Compared with other methods,this method does not have to alter the encoding steps.