-
STBC_sim
Space Time of Block Code Simulation
- 2008-05-30 22:32:43下载
- 积分:1
-
DCTlicheng
研究表明,构成K一L变换矩阵的向量也就是ToePhtz矩阵的特征向量。与此同时,离散
余弦变换矩阵逼近于ToePutz矩阵的特征向量矩阵,所以离散余弦变换矩阵与自然图像的
K一L变换矩阵十分相似。经过离散余弦变换后的变换系数块的协方差矩阵Cy非常接近对角
阵,即除了对角线元素以外,其它很多元素都近似为0,并且在左上角集中了主要能量。这
反映了自然图像大部分区域变化不大,亮度突变只占少数,即图像能量以低频成分为主的特
性。通过变换后的量化,舍弃对视觉效果影响较小的次要信息,可达到进一步的压缩效果。
虽然从去相关性能的意义上讲,DCT是一种次于K一L变换的准最佳变换,但是从算法实现的角度来看,DCT则远远优于K一L变换。首先,当图像的分块大小确定后,DCT的变换矩阵也就随之确定了,不随输入信号的统计特性变化而变化 其次,二维DCT能够分解成两次一维DCT,有利于硬件实现。
(Studies have shown that constitute a K L transformation matrix vector is ToePhtz eigenvector of the matrix. At the same time, discrete
The cosine transform matrix approximation in ToePutz matrix eigenvector matrix, so the discrete cosine transform matrix and natural images
Is very similar to a K L transformation matrix. After discrete cosine transform, the transform coefficient block of Cy is very close to the diagonal of covariance matrix
Matrix, namely except diagonal elements, many other elements are approximate to 0, and focused the main energy in the upper left corner. this
Reflects the natural images most area changed little, brightness mutations accounted for only a few, the energy is given priority to with low frequency components of image
Sex. Through quantitative after transformation, abandoning smaller effect on the visual performance of secondary information, can achieve further compression effect.
Although from related to the performance of the sense, DCT is a kind o)
- 2013-11-25 16:00:24下载
- 积分:1
-
PDFmatlabsovler
说明: 详细的偏微分方程的matlab求解步骤与程序说明。(detailed PDE soler ,using PDE tools and codes.)
- 2009-08-07 21:59:55下载
- 积分:1
-
m3
the file simulation in simulink matlab
- 2013-08-06 22:25:19下载
- 积分:1
-
Mintegera
通常matlab不能进行整数规划,现一一款混合整数的线形规划matlab m文件
(Usually matlab integer programming, now a mixed integer linear programming matlab m file)
- 2012-08-12 20:51:40下载
- 积分:1
-
designing_of_iir_bp_bs_filters
Designing a bandpass and bandstop filter using matlab.
- 2010-09-25 01:12:45下载
- 积分:1
-
OFDM_64QAM
64QAM调制的OFDM系统Simulink仿真模型(Simulink model of 64QAM modulated OFDM system )
- 2010-06-01 09:42:14下载
- 积分:1
-
PSO-and-PSOEM-simulation
基于扩展记忆的粒子群优化算法(Particle Swarm Optimization based on memory)(This paper combines SVM with improved PSO (Particle Swarm Optimization with Extended Memory, PSOEM) and then builds PSOEM-SVM forecasting model. The PSOEM searches the solution space intelligently and finds out the best one. Parameters in SVM are optimized by PSOEM, which implements automation of the parameter optimization avoiding the blindness of selecting parameters. Not only does it utilize the generalization feature of SVM, but enhance the global search ability of PSO (Particle Swarm Optimization). Thus, both accuracy and speed are increased at the same time.)
- 2012-04-29 20:47:48下载
- 积分:1
-
DriferTracking
漂流跟踪文献,主要是高频地波雷达相关内容。仅作参考(Rafting tracking literature, mainly HFSWR related content. For reference only)
- 2013-10-16 23:51:15下载
- 积分:1
-
aeroblk_guidance
航空飞行器惯性导航的数学建模与实时系统仿真(Aviation aircraft inertial navigation Mathematical Modeling and Simulation of real-time systems)
- 2013-07-18 16:09:18下载
- 积分:1