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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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NNBR
首先通过自相关 偏自相关分析获得特征向量的维数,随后继续运行后面的代码以获得预测值,该方法为最近邻抽样回归预测(The dimension of feature vectors will be obtained by the autocorrelation and partial autocorrelation analysis, then continue to run the code behind to get predicted value,its short name is NNBR)
- 2014-07-18 18:14:50下载
- 积分:1
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Matlab-Data-field
此为matlab函数库,种类齐全,可供用matlab仿真的开发者使用。(malab data)
- 2012-05-21 17:11:11下载
- 积分:1
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butterworth
butterworth滤波器,实现高通低通带通的butterworth滤波器
- 2009-04-12 12:29:05下载
- 积分:1
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Cognitive_Radio_Communications_and_Networks__Prin
Cognitive Radio
Communications and
Networks
Principles and Practice
Edited by
Alexander M. Wyglinski, Ph.D.,
Worcester Polytechnic Institute
Maziar Nekovee, Ph.D.,
BT Research and University College London
Y. Thomas Hou, Ph.D.,
Virginia Polytechnic Institute and State University
- 2013-09-22 12:09:36下载
- 积分:1
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fft
matlab程序,FFT变换matlab程序,有助于初学者学习(matlab program,it will help u to study)
- 2011-06-06 19:38:12下载
- 积分:1
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diodeclampedinv
diode clamp inverter one leg operation basic stucture implimanted in matal/simulink2010@b
- 2013-08-26 06:05:11下载
- 积分:1
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beam2
matlab挠曲线,剪力图,弯矩图绘制,运行时直接打开boom2.m(matlab deflection curve)
- 2013-04-22 19:28:39下载
- 积分:1
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matlab_xinhaofashengqi
这是自己写的一个 数字信号发生器 ,里面包含几个界面,包括了 电子琴、电话机按键、信号合成等,可以声卡发生,请参考!(This is to write a digital signal generator, which contains several interfaces, including keyboard, telephone keypad, signal synthesis, can sound occurred, please refer to!)
- 2010-10-30 10:59:59下载
- 积分:1
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atividade1
Crossover fron generic algorithm, matlab
- 2013-07-30 23:41:03下载
- 积分:1