逐次逼近量化(Successive-Approximation Quantization,SAQ) 内嵌编码的核心在于采用了逐次逼近的量化方法（SAQ）。
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...经作了介绍，下面我们来介绍EZW编码中 另一个概念：逐次逼近量化(successive-approximation quantization,SAQ) 。 逐次逼近量化(SAQ) 指的是通过一系列阈值 0 1 1 , , , N T T T − ...
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逐次逼近量化符号 Successive-Approximation QuantizationSymbols
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该方法通过引入快速逐次逼近量化和对小波变换边缘子带的特殊处理，对EZW算法进行了改进。
The algorithm improves the EZW algorithm through inducting fast successive approximation quantization and effective treatment of marginal subband of wavelet transform.
首先确定初始阈值，并构造小波系数的关系矩阵，然后结合关系矩阵对高频子带系数进行逐次逼近量化编码。
Finally, the initial threshold is identified and relation matrix is constructed, and the wavelet coefficients of the high frequency subbands are encoded progressively by using relation matrix.
该方案结合逐次逼近量化的思想根据图像小波分解后系数的多分辨特点来模拟人类视觉系统特性，并在图像试验中结合感兴趣区域进行编码。
The scheme simulates HVS with the idea of SAQ based on the character of MRA of image coefficients after wavelet transform, which is put into experiments with ROI encoding.
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