There are two main transform domain methods, one is to use the discrete cosine transformation (DCT); the other would be the use of discrete wavelet transforms (DWT).
目前主要有两种变换域方法，一种是使用离散余弦变换(DCT)，另一种是使用离散小波变换(DWT)。
Compared with JPEG, JPEG 2000 made substantial improvements, the most important of which is discrete wavelet transform (DWT) instead of the JPEG standard discrete cosine transform.
与jpeg相比，JPEG 2000作了大幅改进，其中最重要的是用离散小波变换(DWT)替代了JPEG标准中的离散余弦变换。
The discrete wavelet transform (DWT) is used to analyse the spectra of pollution clouds in complicated environment and extract the small features.
应用离散子波变换进行污染云团红外光谱信号分析及特征提取。
By studying three dimensional discrete wavelet transform (3d DWT) core algorithm in deepness, the paper divides it into three one dimensional discrete wavelet transforms (1d DWT).
通过深入研究三维离散小波变换(3dDWT)核心算法，将其分解为3个一维的小波变换(1d DWT)。
Advanced signal processing techniques such as discrete wavelet transform (DWT) and a corrected multiresolution Fourier transform (MFT) are applied to investigate the vibration and current transients.
信号处理的先进技术，如离散小波变换(DWT)和纠正多分辨傅立叶变换(MFT中)是适用于调查的振动和电流瞬变。
A new image blind watermarking algorithm based on adaptive quantization step in discrete wavelet transform (DWT) is proposed, which can be used in copyright authentication.
提出了一种可用于版权认证的基于小波变换域自适应量化步长的图像盲水印算法。
This thesis achieves the following three innovative results: 1 the thesis presents a new parallel array 2-d discrete wavelet transform DWT hardware architecture based on lifting schemes.
以下是本文的三个创新性成果：1设计了一种并行阵列式二维离散小波变换DWT提升格式的硬件结构。
Currently, there are many DWT (Discrete wavelet Transform) based watermarking algorithms, but few of them discuss the issue in association with fractal image coding in wavelet domain.
目前有很多基于离散小波变换(DWT)的水印算法，但结合分形编码技术的很少。
In this paper, a multipurpose image watermarking algorithm based on chaos and DWT (Discrete Wavelet Transform) is proposed.
提出了一种基于混沌的DWT域多功能图像数字水印算法。
The discrete wavelet transform(DWT) has a localized characteristic in time-frequency domain and a transform mechanism that accords with human visual system.
小波变换具有时频局部化特性和与人眼视觉特性相符的变换机制，而混沌序列具有确定、似随机、不可预测等特性。
The discrete wavelet transform(DWT) has a localized characteristic in time-frequency domain and a transform mechanism that accords with human visual system.
小波变换具有时频局部化特性和与人眼视觉特性相符的变换机制，而混沌序列具有确定、似随机、不可预测等特性。
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