基于分块dct变换的编码方法，由于具有良好的去相关性和能量压缩特性，已经成为现有大多数图像和视频编码标准的核心技术。
The Method based on the DCT transformation has been the center technology for most of the digital image and video coding standards, since it features on good de-correlation and energy compression.
随着新的图像和视频压缩标准的施行，基于离散小波变换的数字水印技术成为研究的热点。
With the enforcement of the new compression standard of picture and video, the digital watermarking technology based on DWT are becoming the focus of the research of digital watermarking.
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