The difference among spatial domain watermarking , watermarking based on fractals and frequency domain watermarking are analyzed . chapter 3 describes the theoretical capacity measures for information hiding based on still image 利用直接扩频技术把被隐藏信息转换为嵌入信号并将它嵌入选定的静止图像的dct系数中,对水印信道容量进行计算。
Simply state , topology optimization consists of determining the best arrangement of a limited volume of structural material within a given spatial domain so as to obtain the optimal mechanical performance of the concept design 拓扑优化是指确定结构单元、节点及内部边界的空间连接方式。其要求结构工作性态良好,结构物有较高的安全度和可靠性。
Thus the main and auxiliary polarization radars form a side lobe canceller system . based on the modeling of this system , an anti - jamming filter algorithm in the polarization - spatial domain is brought forward 针对接收全极化雷达,在其旁边放置全向双极化正交阵列天线与雷达构成旁瓣对消系统,并根据系统模型提出了极化域-空域联合滤波抗干扰算法。
This paper discusses 4 types of processing methods : time - spatial domain frequency splitting random noise attenuation , frequency - spatial domain coherent noise attenuation , waveform match processing and gather data fitting 3 - d random noise attenuation 针对这一问题,进行了数据优化处理技术研究,研究的基础资料是胜利油田渤深6区块的三维地震数据。
Regarding to the algorithms of speckle reduction , many algorithms have been presented abroad and domestic . for examples , the multi - looks averaging , the filtering of spatial domain and the filtering of polarimetric domain and so on 关于sar及极化sar的相干斑抑制,国内外已经提出了不少的算法,从最初的多视平均到空域滤波,再到极化域滤波等等。