说明：  本文介绍了基于DCT 的图像压缩编码技术, 并给出了具体的实现方法和步骤, 既保证具有较高的压缩比, 又保证了较好的图像 质量。
(This paper introduces the coding of image based on DCT , therefore,shows the details of realization . It provides high compressibility and high quality.)