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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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PSO_DynamicEnvironment
PSO_DynamicEnvironment是用粒子群算法(particle swarm algorithm)解决动态环境寻优(最优值不断变化)的问题。文件打开后运行PSO_DynamicEnvironment.m文件即可得到结果,代码中有详细注释,方便修改。运行示例已经保存为图片附在压缩包中。(PSO_DynamicEnvironment solve dynamic environment particle swarm optimization algorithm (particle swarm algorithm) (optimal value changing) problems. Run PSO_DynamicEnvironment.m file to get the file to open the result, the code has detailed notes, easy to modify. Run the sample has been saved as a picture attached to the compressed package.)
- 2014-02-08 12:50:33下载
- 积分:1
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2sphere2D
基于时域有限差分法(FDTD),用MATLAB编程计算双球金纳米颗粒的局域电磁场增强(二维)的程序||2sphere2D.m(Base on FDTD ,local field enhancement of gold double sphere nanoparticles(2D)by Matlab || 2sphere2D.m)
- 2014-01-06 21:08:42下载
- 积分:1
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quadcopter
四旋翼动力学仿真,参考来源北航动力学小组(quad-rotor dynamics simulation)
- 2021-03-18 16:39:20下载
- 积分:1
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gold
gold序列生成的matlab代码源程序(gold matlab)
- 2013-03-10 15:15:37下载
- 积分:1
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RPHtools
RPH tool is Matlab algoritm for Rock physics analysis
- 2013-09-01 00:43:12下载
- 积分:1
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sim_analy
Adhoc networks simullations for a thesis project in my master degree
- 2011-12-09 11:08:30下载
- 积分:1
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CNN_face_detection-master
CVPR2015级联CNN进行人脸检测的MATLAB实现代码,按照流程实现,效果绝佳(CVPR2015 cascade CNN for face detection MATLAB implementation code, according to the sequence, and excellent results)
- 2016-04-27 16:50:00下载
- 积分:1
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pn_generator
PN码发生器的matlab程序,对于写vhdl代码有很重要得参考价值(PN code generator matlab procedures, write VHDL code for a very important reference value was)
- 2020-10-09 16:17:34下载
- 积分:1
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matlab
数字信号处理 应用MATLAB 中文pdf(Digital signal processing applications MATLAB Chinese pdf)
- 2009-11-10 12:39:11下载
- 积分:1