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. Platform: |
Size: 5011456 |
Author:lzy |
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Description: 利用矩阵的奇异值分解压缩图像，先将图像分块，对各块中的每个对应象素内积得到相关矩阵A，然后对A进行奇异值分解，选择n（n<N）个较大的特征值对应的特征向量，利用该向量与各块图像内积来压缩和恢复图像-matrix of singular value decomposition image compression, image first block of the block of each pixel corresponding to be associated with the plot matrix A, and then A singular value decomposition, the choice of n (4; N) 000 eigenvalues larger the corresponding eigenvector, the use of the Vector with the block images within the plot to image compression and restoration Platform: |
Size: 1024 |
Author:王志气 |
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Description: Matlab实现图像压缩与重构步骤
① 对图像进行小波分解，得到第一层分解的低频系数和高频系数。
② 保留低频系数，对高频系数进行基于神经网络的矢量量化编码，达到压缩。
③ 根据码书以w还原高频系数
④ 根据保留的低频系数和还原的高频系数重构图像
-Matlab realization image compression and the heavy
construction step (1) pair of picture carries on the wavelet to
decompose, obtains the first decomposition the low frequency
coefficient and the high frequency coefficient. (2) Retains the low
frequency coefficient, carries on to the high frequency coefficient
based on the nerve network vector quantification code, achieves the
compression. (3) To w returns to original state the low frequency
coefficient according to the code book and the return to original
state high frequency coefficient heavy composition which the high
frequency coefficient (4) basis retains likes Platform: |
Size: 19456 |
Author:王危结 |
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Description: 说话人识别是语音识别的一种特殊方式，其目的不是识别语音内容，而是识别说话人是谁，即从语音信号中提取个人特征。采用矢量量化（VQ）可避免困难的语音分段问题和时间归整问题，且作为一种数据压缩手段可大大减少系统所需的数据存储量。本文提出了识别特征选取采用复倒谱特征参数和对应用VQ的说话人识别系统改进的一种方法。当用于训练的数据量较小时，复倒谱特征可以得到比较稳定的识别性能。VQ的改进方法避免了说话人识别系统的训练时间与使用时间相差过长从而导致系统的性能明显下降以及若利用自相关函数带来的大量运算。-Speaker Recognition Speech Recognition is a special way, its purpose is not voice recognition, Who identification but said that the voice signal from extracting personal characteristics. Vector quantization (VQ) can avoid the difficulties subparagraph voice to the issues and the whole time, and as a means of data compression system can significantly reduce the required data storage capacity. This paper presents a selection of identifiers employ Cepstrum parameters and the application of VQ speaker recognition system to improve a side France. When training for the amount of data is smaller, rehabilitation Cepstrum be relatively stable recognition performance. VQ improved ways to avoid the speech recognition system of training and the use of the difference in time, resulting in excessive sys Platform: |
Size: 23552 |
Author:张开 |
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Description: 多小波是矢量滤波器，所以处理数据之前先进行预滤波，预滤波的好坏影响小波的性能。平衡多小波的出现避免了预滤波，越来越受到中外学者的青睐。-Multiwavelet filter is vector, so before you deal with data pre-filtering, the good and bad effects of pre-filtering properties of wavelets. Balanced Multiwavelet avoid the emergence of pre-filtering, more and more Chinese and foreign scholars of all ages. Platform: |
Size: 4111360 |
Author:张旭 |
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Description: 独特的压缩方法,基于空间向量的压缩方法,压缩比不大但是效果好.-Unique compression method, based on space vector compression method, compression ratio is not good, however. Platform: |
Size: 2048 |
Author:Andy |
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Description: DTC算法压缩，输出编码后的数据和压缩率，程序很简洁，注释很清楚-DTC compression algorithm, the output encoded data and compression ratio, the program is very simple, very clear Notes Platform: |
Size: 2048 |
Author:GYT |
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Description: 这是一段G.729A的编码和解码仿真程序，由C和matlab混合实现，还带有输入语音矢量，可以测试-This is a G.729A encoding and decoding simulation program by C and matlab mixed realize, but also with input voice vector, to test Platform: |
Size: 285696 |
Author:老周 |
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Description: 本文运用了神经网络中的自组织向量机和小波变换相结合，实现了图象的压缩，通过训练样本，得到好的结果-In this paper, the neural network of self-organizing vector machine and wavelet transform combining image compression achieved through the training samples obtained good results Platform: |
Size: 9216 |
Author:李靖 |
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Description: 2D-DCT 压缩图像后，通过QPSK,AWGN信道编码传输后，IDCT解压缩回原始图像，适用于任何图像-Using DCT to compress the orginal image, I use zigzag program, quantization, dct compression, then change the vector to bineary bit to pass through the QPSK channel. And from the binary array, I use IDCT to reconstructe the orignial image. working perfectly. Platform: |
Size: 4036608 |
Author:Jackie |
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Search - vector compression