Description: 利用97小波变换进行图像压缩，用matlab仿真，实验证明它具有较高的压缩比-using wavelet transform image compression using Matlab simulation experiment to prove that it has a higher compression ratio Platform: |
Size: 48128 |
Author:李江涛 |
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Description: 余弦变换压缩，用于图像压缩，压缩比高，且压缩后图像质量仍然很好。适用于灰度图象。-Cosine Transform compression for image compression, compression ratio, and compressed image quality is still good. Apply to the gray-scale image. Platform: |
Size: 34816 |
Author:张弛 |
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Description: 输入：为需要压缩图象的名称,该主程序仅能构处理256灰度图,读者可以自行改编为RGB处理；ratio为压缩比率；level为小波分解的级数
输出:是解压完毕的图象数据矩阵-input : the need for image compression name, the main program can only handle 256 gray level structure, Readers can own adaptation of RGB; ratio of compression ratio; wavelet decomposition level for the series output : is finished unpacking the image data matrix Platform: |
Size: 54272 |
Author:林颖 |
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Description: JPEG压缩方法由于其较高的压缩比和理想的压缩效果，是目前应用最广泛的图像压缩方法-JPEG compression method because of its higher compression ratio and ideal compression effect, is currently the most widely used method of image compression Platform: |
Size: 58368 |
Author:王为 |
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Description: This a JPEG encoding & decoding program of still image. It does not use level shifting. Discrete Cosine transform (DCT) is performed both by classical & Chen s Flowgraph methods. Predefined JPEG quantization array & zigzag order are used here. RUN - LEVEL coding is used instead of Huffman coding. Compression ratio is compared for each DCT method. Effect of coarse and fine quantization is also examined. The execution time of 2 DCT methods is also checked. In addition, most energatic DCT coefficients are also applied to examine the effect in MatLab 7.4.0 R2007a. Input is 9 gray scale pictures & output is 9*9=81 pictures to compare. Blocking effect is obvious.
-This is a JPEG encoding & decoding program of still image. It does not use level shifting. Discrete Cosine transform (DCT) is performed both by classical & Chen s Flowgraph methods. Predefined JPEG quantization array & zigzag order are used here. RUN - LEVEL coding is used instead of Huffman coding. Compression ratio is compared for each DCT method. Effect of coarse and fine quantization is also examined. The execution time of 2 DCT methods is also checked. In addition, most energatic DCT coefficients are also applied to examine the effect in MatLab 7.4.0 R2007a. Input is 9 gray scale pictures & output is 9*9=81 pictures to compare. Blocking effect is obvious.
Platform: |
Size: 95232 |
Author:Ho Joon Lee |
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Description: 基于小波变换的图像压缩代码，包括压缩比、运行时间和计算复原图像的峰值信噪比-Image compression based on wavelet transform code, including compression ratio, operation time and recovery images of the peak signal to noise ratio calculation Platform: |
Size: 413696 |
Author:刘灿 |
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Description: 基于contourlet的图像压缩编码，其中包括计算PSNR值，压缩比和运行时间-Contourlet-based image compression coding, including the calculation of PSNR values, compression ratio and run-time Platform: |
Size: 381952 |
Author:刘灿 |
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Description: 实现对图像的lzw压缩编码 得到图像的压缩比以及码长-Lzw realize image compression coding of image compression ratio as well as the code length Platform: |
Size: 26624 |
Author:matiejun |
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Description: 该程序利用Matlab编写，并带有GUI截面。实现了任意格式图像压缩的功能。并且可以对比显示压缩前后图像，显示压缩比例和压缩时间。-The program prepared by the use of Matlab, and with a GUI cross-section. Image compression format to achieve an arbitrary function. Compared before and after the show and can compress the image, showing compression ratio and compression time. Platform: |
Size: 2048 |
Author:wangwei |
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Description: fractal image compression of gray scale images....
only works for square images...
try with lena.bmp a gray scale one....
good compression ratio acheived Platform: |
Size: 4096 |
Author:Koushik |
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Description: 高光谱图像压缩中的ezw算法，实现了很好的压缩比-Hyperspectral image compression ezw algorithm to achieve a good compression ratio Platform: |
Size: 118784 |
Author:费德勒 |
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Description: 图像压缩主要目的是为了节省存储空间，增加传输速度。图像压缩的理想标准是信息丢失最少，压缩比例最大。不损失图像质量的压缩称为无损压缩，无损压缩不可能达到很高的压缩比；损失图像质量的压缩称为有损压缩，高的压缩比是以牺牲图像质量为代价的。压缩的实现方法是对图像重新进行编码，希望用更少的数据表示图像。-The main purpose of image compression to save storage space, increase the transmission speed. The ideal image compression standard is a minimum loss of information, the maximum compression ratio. Compression without loss of image quality is called lossless compression, lossless compression can not achieve high compression ratio loss of image quality and compression is called lossy compression, high compression ratio at the expense of image quality for the price. Compression of the image is re-encoded data that wish to use fewer images. Platform: |
Size: 9216 |
Author:wanghui |
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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: |
Size: 175104 |
Author: |
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Description: Including compression ratio, image restoration computing uptime and peak signal to noise ratio, There Wavelet Analysis Blind Signal Processing, Clustering analysis based on Euclidean distance. Platform: |
Size: 11264 |
Author:vxbgdy
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Description: Can be widely used in data analysis and forecast data, It contains CV, CA, Single, current, constant turn rate, turning model, Including compression ratio, image restoration computing uptime and peak signal to noise ratio. Platform: |
Size: 7168 |
Author:pingpeiqui
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Description: Including compression ratio, image restoration computing uptime and peak signal to noise ratio, Mainly based on the mtlab procedures, Calculation multifractal detrended fluctuation analysis matlab program. Platform: |
Size: 4096 |
Author:neifougingseng
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Description: Future line prediction, error analysis, Including compression ratio, image restoration computing uptime and peak signal to noise ratio, Contains the eigenvalue and eigenvector extraction, the training sample, and the final recognition. Platform: |
Size: 9216 |
Author:khrmq
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Description: Including compression ratio, image restoration computing uptime and peak signal to noise ratio, Based on multi-document image obtained combining technique, A window function design FIR digital band-pass filter. Platform: |
Size: 151552 |
Author:kkgsd
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