基于DCT变换的JPEG压缩算法在低比特率压缩时容易产生方块效应,严重影响解码图像的视觉效果.主要原因是DCT变换丢失的高频信息较多,本文尝试对其进行改进.主要方法是用小波变换代替JPEG算法中的DCT模块,并用MATLAB对其进行了仿真分析,取得了较好的视觉效果.%JPEG compression algorithm based on DCT transform produces the diamonds effect when working at low bit rate transform, and it influences the vision effect of decoding image badly. The main reason is the DCT transform lose too many high frequency information, so this article tries to improve it. And the main methods is to replace the DCT module in JPEG arithmetic with wave transform, moreover simulates and analyzes it with MATLAB language, and obtaines a better vision effect.
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