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Description: 本文结合DCT变换的特性，利用分形的Peano一hilbert扫描曲线，对基于DCT变换的图像编码方法进行了研究，并提出了改进方法。主要工作分为两个部分: 一是在分块DCT基础上的改进。对分块后生成的各图像块矩阵，不直接作二维DCT变换，而是先进行扫描，使之重排成一维向量，再进行一维DCT变换，这样可以减少运算量。 其次是对层次余弦变换编码部分的改进。使用层次DCT变换与零树编码相结合的方法，并在扫描编码过程中，按Peano一hilbert扫描顺序进行编码。这样不仅可以减少“块效应”，而且可以加快编码速度。-this paper the characteristics of DCT, using fractal Peano a Hilbert scanning curve, the DCT-based image coding method for the study and improvement of methods. The work is divided into two main parts : First, the DCT block on the basis of improvements. Right after block production of the image block matrix, not for direct two-dimensional DCT, but first scan, so they line up in a heavy-dimensional vector and then a peacekeeping DCT, thus reducing the amount of computation. Secondly, the level of cosine transform coding some of the improvements. The use level of DCT and zero tree coding combination of methods, coding and scanning process, according to a Hilbert Peano code scanning sequence. This will not only reduce the "blocking effect" but we can speed up the coding speed.
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Author: lzy |
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Description: gmeans-- Clustering with first variation and splitting
文本聚类算法Gmeans ,使用了3种相似度函数,cosine,euclidean ,KL.文本数据使用的是稀疏矩阵形式.
-gmeans clustering with first variation and splitting
Gmeans,a text clustering algorithm, uses 3 functions,cosine,euclidean and KL in similarity measuring.Text data are described by sparse matrix.
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Size: 71680 |
Author: 修宇 |
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Description: 二维图像离散余弦变换：数字图像处理常用例程，可执行文件在Release中，具体说明见Readme。-two-dimensional discrete cosine transform image : Digital image processing routines used, in the Release executable file, specify see readme.
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Size: 138240 |
Author: 陈咚 |
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Description: 升余弦滚降系统的源程序
matlab程序示例-Raised Cosine source of the examples Matlab
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Size: 1024 |
Author: 邓量 |
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Description: 快速傅立叶变换和离散余弦变换的简单实现，有一些小问题，就不修复了，呵呵。-fast Fourier transform and discrete cosine transform a simple, and it is only a small problem, not repaired, huh.
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Size: 357376 |
Author: asly |
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Description: 这是用VHDL语言(硬件描述语言)写的一个二维
8*8块的离散余弦变换(DCT)以及反变换(IDCT).全同步设计,低门数.可以用于多媒体及打印应用领域.-VHDL (hardware description language) wrote a two-dimensional 8* 8 discrete cosine transform (D CT) and the anti-transform (IDCT). fully synchronous design, low gate count. can be used for multimedia and print applications.
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Size: 32768 |
Author: citybus |
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Description: 这是升余弦滚降系统，包括时域波形，付氏变换，功率普分析，以及眼图，很有用的-Raised Cosine system, including time-domain waveform, Fourier transform, power & P analysis, and eye diagram, a very useful
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Size: 1024 |
Author: 李彩 |
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Description: 实现快速离散余弦变换的C代码。用在2 维图形压缩处理的预先处理-fast discrete cosine transform C code. Using the two-dimensional graphics compression pre-treatment
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Size: 2048 |
Author: 闫位岸 |
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Description: M-file for simulating a QPSK transmitter by modulating with a pseudo random bit stream. A serial to parallel conversion of the pseudo random bit stream is performed with mapping of two bits per symbol. A cosine and sine carrier is configured and the I and Q symbols modulate these carriers. The I and Q carriers are combined and time and frequency domain plots are provided showing key waveforms at various positions in the QPSK transmitter.
-M-file for simulating a QPSK transmitter b y modulating with a pseudo random bit stream. A s erial to parallel conversion of the pseudo rand om bit stream is performed with mapping of two bi ts per symbol. A cosine and sine carrier is CBMs gured and the I and Q symbols Modulate these CARR IERS. The I and Q carriers are combined and a time nd frequency domain plots are provided showing key waveforms at various positions in the QPSK t ransmitter.
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Size: 2048 |
Author: xiaoying |
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Description: 程序代码说明
P0301：数字图像矩阵数据的显示及其傅立叶变换
P0302：二维离散余弦变换的图像压缩
P0303：采用灰度变换的方法增强图像的对比度
P0304：直方图均匀化
P0305：模拟图像受高斯白噪声和椒盐噪声的影响
P0306：采用二维中值滤波函数medfilt2对受椒盐噪声干扰的图像滤波
P0307：采用MATLAB中的函数filter2对受噪声干扰的图像进行均值滤波
P0308：图像的自适应魏纳滤波
P0309：运用5种不同的梯度增强法进行图像锐化
P0310：图像的高通滤波和掩模处理
P0311：利用巴特沃斯（Butterworth）低通滤波器对受噪声干扰的图像进行平滑处理
P0312：利用巴特沃斯（Butterworth）高通滤波器对图像进行锐化处理
-code P0301 : digital image data matrix display and Fourier Transform P0302 : two-dimensional discrete cosine transform image compression P0303 : using gray transform method to enhance the contrast of the image P0304 : histogram equalization P0305 : simulation images by Gaussian white noise and pepper noise impact P0306 : using 2D median filtering function medfilt2 right by the Salt and Pepper noise filtering images P0307 : MATLAB functions filter2 of noise interference filter images mean P0308 : Image Adaptive Filter WEI Na-P0309 : using five different gradient Enhancement Act for image sharpening P0310 : images of high-pass filtering and mask handling P0311 : use Butterworth (Butterworth) low-pass filter on the noise in the image smoothing P 0312 : Butterworth (Butterworth) high-pass filt
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Size: 669696 |
Author: tiantian |
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Description: Image Compression
A collection of simple routines for image compression using different techniques.
BTCODE:
Image compression Using Block Truncation Coding.
PYRAMID:
Image compression based on Gaussian Pyramids.
DCTCOMPR:
Image compression based on Discrete Cosine Transform.
-Image Compression A collection of simple r outines for image compression using different techniques. BTCODE : Image compression Using Block Truncation Codi Vi. PYRAMID : Image compression based on Gaussian Pyramids. DCTCOMPR : Image compression based on Discrete Cosine trapidil nsform.
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Author: like |
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Description: 研究用于自适应均衡器的LMS算法的性能，数据源产生有零平均和单位方差的由符号+1和-1组成的Bernoulli的序列{I(n)}.数据源之后的信道可以用升余弦脉冲响应来模拟。
-study for the adaptive equalizer LMS algorithm performance, Data Sources have zero mean and unit variance from the-1 and a symbol of the Bernoulli sequence (I ( n)). Data Source after the channel can be raised-cosine pulse response simulation.
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Size: 1024 |
Author: lee |
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Description: 自己编写的超宽带系统简单仿真平台，有简单界面.包括可替换的脉冲成型（半余弦脉冲）、IEEE802.15.3a的修正SV信道、最大似然信道估计、Rake接收机等模块，可以实现monte carlo仿真求误码率。可添加多址接入、编码等功能（维特比编解码、帧同步的程序由本人同学编写）。入口主程序uwbsim.m
编解码程序：bin2deci.m；bini2deci.m；deci2bin.m VITRBI.m
信道及信道估计：ch_est.m；channel.m；channelgenerator.m；conv_m. m；sigfold.m UWB_SV_channel.m uwb_sv_cnvrt_ct.m uwb_sv_eval_ct.m uwb_sv_model_ct.m uwb_sv_params.m
Rake接收机：findpeak.m；MRC_combine.m；MRC_Rake.m；n_upsample.m；selectpath.m
其他：cnv_encd.m；dssignal.m；Eb_halfcos.m；waveshape.m；halfcos_generator.m；metric.m；nxt_stat.m；sim_main.m；spreadgren.m；test_code.m；training_ds.m；uwbsim.m；vit_test.m
-own UWB prepared by the simple system simulation platform, A simple interface. including replacement of the pulse shaping (semi-cosine pulse). IEEE802.15.3a amendment SV Channel, the greatest likelihood channel estimation, the Rake receiver modules. can be achieved monte carlo simulation for BER. They can add multiple access, coding, and other functions (Viterbi codec, frame synchronization procedures prepared by my classmates). Edit the entrance uwbsim.m codecs : bin2deci.m; bini2deci.m; deci2bin.m VITRBI.m Channel and Channel Estimation : ch_est.m; channel.m; channelgenerator.m; conv_m. m; sigfold.m UWB_SV_channel.m uwb_sv_cnvrt_ct . m uwb_sv_eval_ct.m uwb_sv_model_ct.m uwb_s v_params.m Rake : findpeak.m; MRC_combine.m; MRC_Rake.m; n_upsample.m; selectpath.m Other : cnv_encd.m; dssignal.
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Size: 31744 |
Author: volvo827 |
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Description: discret cosine transform,DCT-discret cosine transform, DCT
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Size: 674816 |
Author: qu yw |
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Description: DSP5402产生余弦信号以C语言源代码,已仿真通过-DSP5402 cosine signals to produce C language source code, through simulation
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Size: 4096 |
Author: leo |
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Description: 升余弦滚降系统的源程序(用于调制解调系统中波形成型)-Raised Cosine system of the source (for modulation and demodulation waveform prototyping system)
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Size: 4096 |
Author: 陈大山 |
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Description: Discrete cosine Transform的VC源代码
希望能对大家有帮助-Discrete Cosine Transform VC source code in hopes of Members help
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Size: 48128 |
Author: lixin |
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Description: 程序代码说明
P0301：数字图像矩阵数据的显示及其傅立叶变换
P0302：二维离散余弦变换的图像压缩
P0303：采用灰度变换的方法增强图像的对比度
P0304：直方图均匀化
P0305：模拟图像受高斯白噪声和椒盐噪声的影响
P0306：采用二维中值滤波函数medfilt2对受椒盐噪声干扰的图像滤波
P0307：采用MATLAB中的函数filter2对受噪声干扰的图像进行均值滤波
P0308：图像的自适应魏纳滤波
P0309：运用5种不同的梯度增强法进行图像锐化
P0310：图像的高通滤波和掩模处理
P0311：利用巴特沃斯（Butterworth）低通滤波器对受噪声干扰的图像进行平滑处理
P0312：利用巴特沃斯（Butterworth）高通滤波器对图像进行锐化处理
-code P0301 : Digital image data matrix display and Fourier Transform P0302 : Two-dimensional discrete cosine transform image compression P0303 : Gray used a new method to enhance the contrast of the image P0304 : histogram equalization P0305 : Simulation images by white Gaussian noise and Impulse noise impact P0306 : 2D median filtering function medfilt2 right by the Salt and Pepper image noise filtering P0307 : MATLAB filter2 the function of noise interference by the image filtering P0308 : Image Adaptive Filter Weiner P0309 : use five different gradient Enhancement Act for image sharpening P0310 : Images of the high-pass filtering and mask handling P0311 : use Butterworth (Butterworth) low-pass filter to noise interference by the image smoothing P 0312 : Butterworth (Butterworth) high-pa
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Size: 11264 |
Author: Jimmy Yen |
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Description: 本文件是离散余弦的具体实现，文件虽然简单了点，但希望对大家有所帮助！-The present document is a concrete realization of discrete cosine, while the paper a simple, but we want to help!
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Size: 9216 |
Author: 张影风 |
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Description: cosine similarity measure
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Size: 1024 |
Author: saeede |
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