【摘要】 变换编码在图象压缩中应用得十分广泛 ,DCT变换以其是最接近K -L变换的“准最佳变换”特性被MPEG、H .2 6 1、JPEG等国际标准所采纳。但是 ,在基于DCT的压缩系统中 ,块效应是造成图象质量下降的一个重要原因。本文将对块效应的产生进行详细的分析 ,介绍并比较块效应的几种度量和消除方法。更多还原

【Abstract】 Transform encode is widely used in image compression.DCT transform is accepted by many international standard such as MPEG H.263 and JPEG because of it’s “Near Best transform” characteristic.But in the compression system based on DCT transform,blocking effect is a major degradation of image quality.In this paper,at first we analyze why and how the blocking effect appears,then we introduce some kinds of measure and reduction algorithm of blocking effect and make some comparison.更多还原