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: 对原始灰度图像 Lena_gray.bmp进行图像压缩实验
1．对此图进行 8×8 DCT 变换后，分别只保留 DC系数，以及保留前 4、8、16 个变换系数(DC＋AC) ，然后再分别进行 IDCT 变换，比较结果。
2．可以使用 Matlab - Image Processing Toolbox 中的函数实现。
-gray image of the original image compression Lena_gray.bmp an experiment. This diagram 8 8 DCT, the only difference reservations DC coefficient, and the preservation of the former 4, 8 or 16 DCT coefficients (DC+ AC), and then separately IDCT transformation, the results of the comparison. 2. Using Matlab-Image Processing Toolbox to achieve the function. Platform: |
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Author:朱晓路 |
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Description: 图像压缩中的快速DCT变换及其反变换的原理与实现-Fast image compression DCT transform and its inverse transform and realization of the principle Platform: |
Size: 83968 |
Author:W.Huayi |
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Description: 用Verilog HDL编写的离散余弦变换，可用于视频图像压缩，并在modelsim SE6.0中仿真通过-Verilog HDL prepared with discrete cosine transform can be used for video image compression, and modelsim SE6.0 simulation through Platform: |
Size: 1024 |
Author:yangyanwen |
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Description: 利用DCT变化对tif图像进行压缩利用DCT变换进行图像压缩的MATLAB程序-Changes in the use of DCT compression of tif images using DCT transform image compression MATLAB program Platform: |
Size: 802816 |
Author:ruiomar |
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Description: 这是一个基于DCT的图像JPEG压缩程序，并将压缩码保存在一TXT文本中-This is a DCT-based JPEG image compression process, and code stored in a compressed text in TXT Platform: |
Size: 59392 |
Author:yang |
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Description: This the Discrete cosine tranform matlad code which is useful for image compression and also it show-This is the Discrete cosine tranform matlad code which is useful for image compression and also it show Platform: |
Size: 1096704 |
Author:sunil |
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Description: a dct code i tried.. the image compression using dct divides the image into various blocks n the performs the dct code on it -a dct code i tried.. the image compression using dct divides the image into various blocks n the performs the dct code on it .. Platform: |
Size: 1024 |
Author:anup |
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Description: 基于DCT变换的图像压缩，分别给出了灰度图和真彩图的压缩方法。-DCT-based image compression, respectively, are given grayscale and true color pictures of the compression method. Platform: |
Size: 1024 |
Author:秦关 |
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Description: 将图象分块(8*8)，作DCT变换，并作IDCT：DCT是一种可分离图象变换，用来图象压缩编码，IDCT用来解压缩。-The image sub-block (8* 8) for the DCT transform, and to make IDCT: DCT is a separable image transformations, is used to image compression coding, IDCT is used to decompress. Platform: |
Size: 7168 |
Author:zy |
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Description: 利用DCT变换和哈德曼编码实现对彩色位图的压缩，并可求得图像压缩前后的差值。-Use DCT transform and Hardman Coding compression of color bitmap, and the difference obtained before and after image compression. Platform: |
Size: 8155136 |
Author:lu |
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Description: 基于DCT的图像压缩的简单例子，方便新手学习。(DCT based image compression simple example, easy for beginners to learn.) Platform: |
Size: 240640 |
Author:郑景仁
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