Description: 本文主要是用matlab提供的小波包对图像进行分解、压缩、重构-This article is mainly used to provide matlab wavelet packet decomposition of images, compression, Reconstruction Platform: |
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Author:fayegyf |
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Description: 用MatLab实现图像压缩。以真彩图像的处理为例，对由它转换来的彩色索引矩阵进行二进小波多层分解，对低频近似的系数矩阵作相应的截取处理，以及优化索引图像的彩色图。-Realize image compression using MatLab. To deal with true color images for example, by its conversion to the color index matrix dyadic wavelet decomposition of multi-storey, low-frequency approximation of the coefficient matrix for the corresponding interception treatment, as well as the optimization of image color map index. Platform: |
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Author:郝鹏翼 |
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Description: This program compress and recostruct using wavelets. We can select level of decomposition(here maximum 4 levels are given) of images using selected wavelet.
For eg:-wavelets can be haar, db1, db2,dmey...............
Decomposition can be viewed in figure.
(Please note that select 256X256 image for better result.)
Then compression can performed,
PERFL2 give compression score.
Then reconstruction can be performed.
Each decompsition we can choose different threshold values.
For each threshold value we can calculate mse,psnr,pq(picture quality),
bit ratio etc. To get pq install pqs function . -This program compress and recostruct using wavelets. We can select level of decomposition (here maximum 4 levels are given) of images using selected wavelet.For eg:-wavelets can be haar, db1, db2, dmey ........ ....... Decomposition can be viewed in figure. (Please note that select 256X256 image for better result.) Then compression can performed, PERFL2 give compression score.Then reconstruction can be performed.Each decompsition we can choose different threshold values . For each threshold value we can calculate mse, psnr, pq (picture quality), bit ratio etc. To get pq install pqs function. Platform: |
Size: 3072 |
Author:陈语恬 |
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Description: 随着信息技术的发展，产生了大量的图片，气象云图，遥感图像等静止图像，但数据量大一直都是抑制图像传播流通的一个瓶颈。这里面有一些图像压缩技术的matlab实现-With the development of information technology, resulting in a large number of pictures, weather cloud, remote sensing images such as still images, but the large amount of data has been inhibited the spread of the circulation of images a bottleneck. There are a number of image compression technology to achieve the matlab Platform: |
Size: 4096 |
Author:lz |
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Description: 实验目的
本次实验与书中第二章及3.2节的部分内容有关，包括以下几个部分：
（1）开始使用MATLAB
（2）显示图像，理解图像的模型
（3）使用图像的不同格式，理解图像压缩的意义
（4）对图像做简单的操作
本次实验需要熟练使用以下几个MATLAB命令：
imread, imwrite, imshow,figure
-Experimental purposes of this experiment with the book, chapter and part of the contents of 3.2, including the following sections: (1) start using MATLAB (2) show the images, understanding image model (3) the use of images in different formats, understand the significance of image compression (4) on the image to do a simple experiment needs to operate the skilled use of the following MATLAB command: imread, imwrite, imshow, figure Platform: |
Size: 1024 |
Author:Victor |
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Description: 实验目的：
1） 图像水平集合
2） 图像加密算法
3） 边缘提取
4） 噪音图像的产生
（2）显示图像，理解图像的模型
（3）使用图像的不同格式，理解图像压缩的意义
（4）对图像做简单的操作
本次实验需要熟练使用以下几个MATLAB命令：
imread, imwrite, imshow,figure
-Experimental purposes: 1) the level of collection of image 2) image encryption algorithm 3) Edge 4) noise generated images (2) display images, understanding image model (3) the use of images in different formats, understanding the significance of image compression (4) image to do a simple experiment needs to operate the skilled use of the following MATLAB command: imread, imwrite, imshow, figure Platform: |
Size: 6144 |
Author:Victor |
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Description: 利用二维小波分析对一幅图象作2层小波分解,并在此基础上提取各层的低频信息实现图像的压缩.-The use of two-dimensional wavelet analysis of images for a 2-layer wavelet decomposition, and on this basis the low-frequency information extracted all levels to achieve image compression. Platform: |
Size: 2048 |
Author:龙活 |
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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: The frequency domain plays an important role in image
processing to smooth, enhance, and detect edges of images. Although
image data typically does not include imaginary values, the fast Fourier
transform (FFT) has been used for obtaining spectra. In this paper,
the fast Hartley transform (FHT) is used to transform two-dimensional
image data. Because the Hartley transform is real valued, it does
not require complex operations. Both spectra and autocorrelations of
two-dimensional ultrasound images of normal and abnormal livers were
computed. Platform: |
Size: 4096 |
Author:archit |
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Description: 两个图像质量评价函数，psnr峰值信噪比，正则均方误差nmse，能可用于去噪图像和压缩图像的质量评价，很有用啊。-Two image quality evaluation of the function. Including psnr PSNR, it is mean-square error nmse other. Images can be used for de-noising and compression of image quality evaluation. Platform: |
Size: 1024 |
Author:sanmu |
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Description: 关于各类图象的攻击,如果滤波,噪音,锐化,JPEG压缩-Attacks on all types of images, if filtering, noise, sharpening, JPEG compression, etc. Platform: |
Size: 1024 |
Author:小户 |
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Description: 已知两个不同图像块亮度数据如下：
（1）分析DCT原理，采用DCT方法，编程并计算相应的DCT系数，分析系数分布特点。
（2）依据视觉特性分析量化表步长的分布特点，完成DCT系数量化。
（3）采用Z形扫描，实现输出数据的统计编码，形成Video stream。
（4）采用IDCT重建图像亮度数据，计算SAD大小，分析产生误差的原因及采用DCT进行数据压缩的原理。（ ）
（5）分别利用左上角1、3、6个系数重建图像，计算相应的SAD，并由此分析直流和低频系数的重要性。
-Known brightness of two different image data block is as follows: (1) Principles of analysis of DCT, the DCT method, program and calculate the corresponding DCT coefficient, analysis of distribution coefficients. (2) quantitative analysis based on visual characteristics of the distribution of long-form features step-by-step to complete the DCT coefficient quantization. (3) the use of Z-scan output data to achieve statistical encoding, the formation of Video stream. (4) the use of the reconstructed image brightness IDCT data to calculate the SAD size, analysis of the causes of errors and the use of DCT for the principle of data compression. () (5), respectively, a factor of 1,3,6 using the upper left corner of the reconstruction of images, calculating the corresponding SAD, and the resulting analysis of DC and the importance of low-frequency coefficients. Platform: |
Size: 1024 |
Author:张元 |
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Description: matlab 实现对图像基本处理
包含 图像的幅度谱图及频域滤波，数字图像增强，平滑、锐化处理的模板运算，图像压缩与编码，包含原代码和任务书。图片资料齐全-basic matlab image processing to achieve the range of images and spectra of frequency-domain filtering, digital image enhancement, smoothing, sharpening operator templates, image compression and encoding, the original code and the mandate contained in the book. Complete picture of information Platform: |
Size: 100352 |
Author:山东省 |
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Description: 利用霍夫曼编码算法对数字图像进行压缩及解压缩处理，解压出来的图像与源图像几乎完全一致，峰值信噪比为无穷大-The use of Huffman coding algorithm for digital image compression and decompression processing, extracting images from the source image is almost exactly the same infinite PSNR Platform: |
Size: 168960 |
Author:tianjieyu |
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Description: The following implementation steps have been made for the devised algorithm, which is based on 2D-wavelet.
1. Reading an image of either gray scale or RGB image.
2. Converting the image into grayscale if the image is RGB.
3. Decomposition of images using wavelets for the level N.
4. Selecting and assigning a wavelet for compression.
5. Generating threshold coefficients using Birge-Massart strategy.
6. Performing the image compression using wavelets.
7. Computing and displaying the results such as compressed image, retained energy and Zero coefficients.
8. Decompression the image based on the wavelet decomposition structure.
9. Plotting the reconstructed image.
10. Computing and displaying the size of original image, compressed image and decompressed image. Platform: |
Size: 1024 |
Author:fer |
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Description: 彩色数字图像处理（很清晰）主要包含三部分内容：数字图像处理色彩基础、彩色图像压缩、色彩量化（涉及Clustering、Grouping、Merge等矢量量化的算法）。
-Main content: Color fundamentals for digital imaging Compression of color images Color quantization（include Clustering、Grouping、Merge method for vector quantization ） Platform: |
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Author:段玉霞 |
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Search - compression of images matlab