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对原始信号做DCT的算法:Cox 和Piva 等人提出的DCT技术的经典之作。Cox利用随机数发生器产生标准正态序列作为水印信息对图像进行整体DCT变换后,选取...
对原始信号做DCT的算法:Cox 和Piva 等人提出的DCT技术的经典之作。Cox利用随机数发生器产生标准正态序列作为水印信息对图像进行整体DCT变换后,选取除去DC系数之外部分较低频率系数叠加水印信息 Piva则修改整幅图像的中频部分。对原始信号分块后,再作DCT的算法:Hsu和Wu 把图像进行8*8分块,将一个二进制序列作为水印放入DCT的中频区;有些学者则计算整个图像的DCT,把一个实数序列嵌入DCT的中频系数上。选择中频区的好处是一方面尽量减少嵌入信息对图像主观视觉的影响;同时,尽量避免有损压缩对水印信息可能带来的损失。还有一种DCT方法就是把水印信息嵌入到高频系数上,但是采用这种方法,抗压缩性非常差。-done to the original signal DCT algorithm : Cox Piva and others made the DCT technology classic. Cox using random number generator producing standard normal sequence information as a watermark image of the overall DCT, DC coefficient selection removed outside some lower frequency coefficient superposition watermark information Piva will be replaced by images of the entire IF part. The original signal block, before making the DCT algorithm : Wu Hsu and put images 8* 8 block, a binary sequence as watermarks Add DCT IF; Some scholars calculated whole image of DCT, a real sequence embedded IF DCT coefficients. IF the choice is a good one to minimize the embedded information to the sub
- 2023-01-30 00:55:03下载
- 积分:1
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邮件注册系统,用vfp完成
邮件注册系统,用vfp完成-mail registration system, complete with Probe
- 2022-02-25 23:49:32下载
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保护电脑防止电脑被bo侵入
保护电脑防止电脑被bo侵入-To protect their computer and prevent computer intrusion was bo
- 2022-04-20 11:48:32下载
- 积分:1
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a scientific calculator procedures
一个科学计算器的程序-a scientific calculator procedures
- 2022-02-21 12:28:36下载
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业余电台的参考资料,你可以参考一下这个东西的原理,对写论文有用处...
业余电台的参考资料,你可以参考一下这个东西的原理,对写论文有用处-Amateur radio reference, you can refer to the principle of this thing for writing papers have useful
- 2022-02-13 00:48:27下载
- 积分:1
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Java written reply function with automatic email TX (137KB)
用Java写的带自动回复功能的email收发程序(137KB)-Java written reply function with automatic email TX (137KB)
- 2022-09-05 00:35:03下载
- 积分:1
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Donald Dick: Sources of Client (command line) v1.53
Donald Dick: Sources of Client (command line) v1.53- Donald Dick: Sources of Client (command line) v1.53
- 2022-01-24 18:01:01下载
- 积分:1
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思想算法,对称加密算法。而不是一个更好的理解…
idea 算法,对称加密算法的一种。相对于DES更好理解而且更安全的算法-idea algorithm, a symmetric encryption algorithm. As opposed to a better understanding and more secure DES algorithm
- 2022-03-02 03:02:16下载
- 积分:1
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分配大量小型类对象(如:10,000小型记录)最快和最佳方法是什么? 当然,MFC 序列流化对象可以完成所需的任务。但是,内存的分配和销毁相当耗时。有没有办法对...
分配大量小型类对象(如:10,000小型记录)最快和最佳方法是什么? 当然,MFC 序列流化对象可以完成所需的任务。但是,内存的分配和销毁相当耗时。有没有办法对此进行改进?-distribution of a large number of small class objects (for example : 10,000 small records), the fastest and best way is of course, MFC-sequence objects can complete the required tasks. However, memory allocation and elimination of time-consuming. Is there a way to improve this?
- 2022-03-03 06:56:25下载
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He4Hook
He4Hook
- 2023-05-14 10:40:02下载
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