脉冲宽度调制或PWM，是通过数字均值获得模拟结果的技术。
Pulse Width Modulation, or PWM, is a technique for getting analog results with digital means.
该技术将水印嵌入到视觉不太敏感的蓝色通道中，通过调制图像子块均值在映射区间上的分布，构建新的图像稳定特征，并实现水印的嵌入和盲检测。
Through modulating the distribution of block average over a mapping range, a new stable image character is built, watermarks are embedded and blind-detect is implemented.
大多数的现代的调制技术都运用了非恒包络调制方式，并且峰值和平均值相差较大。
Most of the modern modulation techniques are jin use of a non-constant envelope modulation, which has a large difference between peak and average.
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