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直接序列扩频系统是在发端直接用具有高码率的扩频编码去扩展信号的频谱,而在收端用相同的扩频编码进行解扩使扩频信号还原为原始信号的一种扩频方式。直接序列系统中用的编码序列通常是伪随机序列或叫伪噪声(PN)码。要传送的信息经数字化后变成二元数字序列,它和伪随机序列模二相加(或相乘)后变成复合码去调制载波。在直接序列系统中通常对载波进行二进制相移键控调制(BPSK)。当扩频调制后由天线发射出去,在接收机中要有一个和发射机中的伪随机码同步的本地码,对接收信号进行解扩,解扩后的信号送到解调器取出传送的信息-
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基于dct的图像水印嵌入,其中水印为伪随机序列。供初学者参考,可正常实现。-Dct-based image watermark embedding, watermark is a pseudo-random sequence. Reference for beginners, and can normally achieve.
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未经任何变化的原始图像上分块嵌入水印信息,且用伪随机序列作为水印,空域图像水印。-Without any change in the original image block embedded watermark information, pseudo-random sequence as a watermark, the airspace image watermark.
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空域水印图像,没采用分块技术,,水印为伪随机序列,算是图像水印初学者该会的第一个程序,在此基础上进一步深入学习。-Airspace watermark image, not using the block technique, the watermark is a pseudo-random sequence can be regarded as image watermarking beginners the first program, on the basis of further stu
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提出一种新颖的基于HVS (Human Visual System) 和DCT (Discrete Cosine Transform)的数字水印算法。为保证视觉透明性和鲁棒性, 通过将二值水印图像映射为标准正态分布的伪
随机实数序列, 并利用HVS 的特性, 将水印嵌入宿主图像中频部分。-Propose a novel digital watermarking algorithm based on the HVS (Human Visual System) and DCT (Discrete
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基于dct的伪随机序列的数字图像水印,算法较为简单,鲁棒性一般,不能很好地抵御噪声攻击-Dct pseudo-random sequence-based digital image watermarking algorithm is relatively simple and general robustness against noise attack can not
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matlab生成伪随机序列,可以便于仿真实验,以及图像研究。-matlab generate pseudo-random sequence, can facilitate the simulation experiments, as well as image research
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改程序可以实现任意阶的伪随机序列的产生,并且以文本格式保存起来,方便查看和调用-Reform program can generate pseudo-random sequence of arbitrary order, and saved in text format for easy viewing and calling
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利用分数阶去水印,嵌入伪随机序列,提高了峰值信噪比-Fractional use to watermark embedding pseudo-random sequence, improve the PSNR
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