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dct
在一个图像块中调整两个(或多个) DCT系数的相对大小。将描述一个使用数字图像作为载体的系统。在编码处理中,发送者将载体图像分成8×8的像素块,每一块只精确地编码一个秘密信息位。嵌入过程开始时,首先伪随机地选择一个图像块bi,用它对第i个消息比特进行编码。令Bi=D{bi}为DCT变换后的图像块。
在通信开始前,发送者和接收者必须对嵌入过程中使用的两个DCT系数的位置达成一致,让我们用(u1,v1)和(u2,v2)来表示这两个索引。这两个系数应该相应于余弦变换的中频,确保信息保存在信号的重要部位(从而使嵌入信息不容易因JPEG压缩而完全丢失
(abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwx)
- 2010-05-29 12:23:08下载
- 积分:1
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mti
mti aire borne radar
- 2012-05-13 15:21:54下载
- 积分:1
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xuanmingzufeng
信号与系统中的音乐合成实验,用matlab合成的曲子。(Signals and Systems in music synthesis experiments using matlab synthesized music.)
- 2013-11-18 15:14:35下载
- 积分:1
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PMSM_FOC
说明: 基于matlab搭建PMSM基础控制模型,采用双环PI控制策略。(PMSM basic control model was built based on matlab, and double-loop PI control strategy was adopted.)
- 2020-02-03 11:10:06下载
- 积分:1
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MATLABIIRfilter
基于matlab的两种数字滤波器的仿真,IIR滤波器的快速设计方法(matlab filter)
- 2011-07-25 16:49:33下载
- 积分:1
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58987
The following Matlab project contains the source code and Matlab examples used for 16 bits fixed point pid controller . This simulation illustrates the effects of the fixed-point computations on the closed-loop precision for a 16-bits PID controller.
The source code and files included in this project are listed in the project files section, please make sure whether the listed source code meet your needs there.
- 2015-02-17 21:50:21下载
- 积分:1
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code
Hough Transform for Iris
- 2014-01-01 08:53:07下载
- 积分:1
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wan_qu_pi_lao_qiang_du
齿轮弯曲疲劳强度分析,濮良贵机械设计课本公式。(The gear bending fatigue strength analysis, textbooks PuLiangGui mechanical design formula。)
- 2014-03-05 09:38:50下载
- 积分:1
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moead_cec2009_2011version
多目标最优化moea算法老版本,带C++源码!(The multiobjective optimization moea algorithm old version, with C++ source!)
- 2013-03-02 23:36:58下载
- 积分:1
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CPM-spread-spectrum
针对传统CPM正交扩频系统实现复杂度高的问题,提出了一种基于预编码的CPM正交扩频系统。(Pre—encoded CPM orthogonal spread spectrum system)
- 2014-10-05 17:06:35下载
- 积分:1