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: 5011825 |
Author:lzy |
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Description: 用SSE2汇报语言实现的H.264视频编码标准中的DCT变换。-using SSE2 reporting language of H.264 video coding standard of DCT. Platform: |
Size: 24576 |
Author:王宏志 |
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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. Platform: |
Size: 5011456 |
Author:lzy |
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Description: 用VC++实现的数字图像处理研究在信息处理和信息传输中,为了提高处理和传输的效率并减少信息损失量,需要将大量信息进行压缩编
码. 数字图像处理中的变换域压缩编码技术是将图像信号以图像数据块为单位作二维变换,然后对各变换系数逐
个地进行量化和编码,达到压缩信息的作用. 离散余弦变换(DCT)在实数域中得到变换结果,并且有快速算法.-Using VC++ to achieve the digital image processing research in information processing and information transmission, in order to improve the efficiency of processing and transmission of information loss and reduce the need for large amounts of information coding. Digital Image Processing in the compressed transform domain coding techniques is image signal to image data block as a unit for two-dimensional transform, and then one by one of the transform coefficients to be quantified and coded, to reduce the role of information. discrete cosine transform (DCT) domain in the real results have been changing, and fast algorithm. Platform: |
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Author:王叶 |
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Description: JPEG标准中规定了4种压缩模式[15]：顺序编码（Sequential encoding），渐进编码（Progressive encoding），等级编码（Hierarchical encoding），无损编码（Lossless encoding）。应用最为广泛的为基于DCT变换的顺序编码，也称之为基准模式(Baseline mode)，其它几种模式都以此为基础。这里，采用了JPEG基准模式对图像进行压缩，在基准模式中，熵编码采用哈夫曼编码方法。
-JPEG standard specifies four kinds of compression [15]: the order of encoding (Sequential encoding), progressive encoding (Progressive encoding), class code (Hierarchical encoding), lossless encoding (Lossless encoding). The most widely used sequence-based DCT transform coding, also known as baseline model (Baseline mode), several other models are based. Here, using the JPEG image compression benchmark model, in the baseline model, the entropy coding using Huffman coding.
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Size: 1024 |
Author:yxl |
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Description: 给予matlab的JPEG压缩程序，包含原始压缩图片，程序对灰度bmp图片进行JEPG编码，压缩成以0101形式的编码。JPEG编码先把图象色彩RBG变成亮度Y和色度Cr、Cb，它利用人的视觉对色度不敏感的特点，减少一部分色度数据，以达到压缩。 JPEG采取多种编码方式，包含有行程编码(Run Length Coding)和哈夫曼(Huffman)编码，有很高的压缩比。在编码前，先对数据进行分块，离散余弦变换（DCT）及量化，保留能量大的低频信号，丢弃高频信号以达到压缩。-Given to the JPEG compression matlab program, contains the original compressed image, the program of the grayscale bmp picture JEPG encoded, compressed into a 0101 form of encoding. RBG color coded JPEG image into a first luminance Y and chrominance Cr, Cb, which uses the human visual characteristics is not sensitive to the color, reduce the number of color data to achieve compression. Take a variety of JPEG encoding, includes length coding (Run Length Coding) and Huffman (Huffman) coding, a high compression ratio. In the code before the data block, discrete cosine transform (DCT) and quantization, to retain a large low-frequency signal energy, discarding high-frequency signals in order to achieve compression. Platform: |
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Author: |
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Description: 利用 DCT 变换编码方法进行图像压缩，提高信息传输的有效性及通信质量。-Transform coding method using DCT for image compression, enhance the effectiveness of information transmission and communication quality. Platform: |
Size: 1024 |
Author:高雪莹 |
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Description: JPEG压缩编码的主要步骤有：
1.通过前向离散余弦变换减少图像数据相关性；
2.利用人眼的视觉特性队DCT系数进行量化；
3.使用查分脉冲编码调制对直流系数进行编码；
4.对交流系数进行Z形扫描，使用形成长度编码队交流系数进行编码；
5.熵编码器对上述描述符进行熵编码。-JPEG compression encoding of the main steps are:
1.forward discrete cosine transform to reduce the image data
2.Using human visual characteristics of the team DCT coefficients are quantized
3.check points pulse code modulation encoding the DC coefficient
4.coefficients of the Z-scan AC coefficient is encoded using the form length encoding team
5.the entropy encoder for entropy coding of the above descriptors. Platform: |
Size: 153600 |
Author:汪晨 |
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Description: 要:基于DCT图像压缩编码技术提出了用Marlab实现离散余弦变换的图像压缩方法，该方法具有方法
简单、速度快、误差小的优点，免去了大量的矩阵计算，既保证具有较高的压缩比，又保证了较好的
图像质量。-Realization of discrete cosine transform image compression using Marlab: Based on the DCT image compression coding techniques, this method has the advantages of method is simple, fast, small error, which eliminates a large number of matrix calculations, both to ensure a high level of compression ratio, but also to ensure better image quality. Platform: |
Size: 189440 |
Author:qixuejiao |
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Description: jpeg coder and decoder with out using block proc function.Reading the image into 8x8 blocks and apllied the DCT transform and quantization using quantization tables.After that seperation of DC and AC coefficients and I applied the DPCM for DC coeffcients,Run Length Coding for AC coefficients.The encoded data is decoded by the decoder which i implemented the reverse process of encoding-jpeg coder and decoder with out using block proc function.Reading the image into 8x8 blocks and apllied the DCT transform and quantization using quantization tables.After that seperation of DC and AC coefficients and I applied the DPCM for DC coeffcients,Run Length Coding for AC coefficients.The encoded data is decoded by the decoder which i implemented the reverse process of encoding... Platform: |
Size: 2048 |
Author:arsenal |
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Description: DCT图像压缩：此源代码变换域系数选取采用区域编码，通过非零区域的选择，呈现不同的恢复效果-DCT image compression: This source code transform domain coefficients using the selected coding region, by choosing a non-zero area, showing the effect of different recovery Platform: |
Size: 1024 |
Author:屋脊上的麻雀 |
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Description: DCT变换：变换域系数选取采用阈值编码，：阈值越小，图像恢复效果越好，但压缩效果差，一般取在5-10 即可很好的获得恢复图像信息。-DCT transform: transform domain coefficients selected using the threshold coding: the smaller the threshold value, the better the image restoration, but the compression is poor, and generally in the 5-10 to get a good recovery image information. Platform: |
Size: 1024 |
Author:屋脊上的麻雀 |
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Description: i need the matlab coding for image fusion using different types of techniques . so, i need the particular coding your file. i need different types pf transform like IHS,PCA, DCT, and brovey transform.- i need the matlab coding for image fusion using different types of techniques . so, i need the particular coding your file. i need different types pf transform like IHS,PCA, DCT, and brovey transform. Platform: |
Size: 25600 |
Author:saranya |
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Search - TRANSFORM CODING USING DCT