低频域 meaning in English

low frequency range

Embedding and detecting algorithm for image watermarking in the lowest frequency domain of wavelet transform
图像小波变换低频域的水印嵌入与检测算法
As we know , hiding information in the high frequency can probably be affected by the attack of jpeg compressing and low - pass filter and so on , however , hiding data in the low frequency domain may make much and even unacceptable chang of source photo
我们知道,高频域的隐藏信息容易受到jpeg压缩、滤波等的影响,鲁棒性低,而在低频域隐藏信息存在对原始图像改变较大的问题。
Two kinds of method to divide the photo into blocks are presented in the dissertation , then the techniques of appending zero , dct transform and changing low frequency coefficents are utilized to hide information ( in fact , information is masked in dc components ) . so information is hided in the low frequency domain of a photo . furthermore , good quantity evaluation is got after compared with original photos
本文通过对原图像分别使用两种分块方法进行分块,然后通过补零, dct变换,改变低频系数来进行信息隐藏(实际上是在直流分量上隐藏信息) ,实现了在低频域进行信息隐藏的目的,且使得隐藏后的图像与原图像相比具有较好的质量评价。