，是盘片上磁场的变化影响到磁头的电阻值；还有最大像素频率 (pixel frequency)，比如6ns的内存实际频率为1／6ns＝166MHz（如果是DDR就标DDR333? 我们必须了解。
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The camera works by illuminating objects with a laser that emits a different infrared frequency for every single pixel, allowing them to custom-amplify a signal that would otherwise be too dim to see.
该相机的工作原理是：用一束激光照在物体上，每一个像素点都被不同红外频率的激光照着，以此来优化放大在其他情况下太弱而看不见的信号。
In low frequency sub band, the watermarking is embedded into host by the way of pixel-to-pixel embedding according to HVS model.
在低频分量部分，基于HVS视觉模型，将水印信号逐点变化地嵌入到原始图像中；
Results Satisfactory results of lung density in 269 patients were achieved, so were the frequency and the curve of pixel distribution.
结果269例肺密度测定的患者均得到了满意的肺密度值、像素在各区间的分布频率和像素分布曲线图形。
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