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图像任意比例压缩或拉伸技术，包括横向和纵向.-image compression ratio or arbitrary drawing techniques, including horizontal and vertical.
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本文探讨了神经网络用于图像压缩的方法，提出了一种基于边缘信息检测的BP神经网络压缩方法:按图像各部分像素特征将图像分为平滑块、纹理块和边缘块，不同的分类块采用不同的隐含层数。实验结果证明本算法在在保证重建图像丰富细节的同时，能大大提高图像的压缩比。-This paper discusses the neural network for image compression method, edge information is presented based on BP neural networ
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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
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基于Matlab GUI的图像的DCT，自由调节压缩率，计算峰值信噪比，并图形化对比还原图像-Matlab GUI for image-based DCT, freely adjust compression rates, the peak signal to noise ratio, and reduction of image contrast graphic
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灰度图像的jpeg压缩处理，解压处理，以及信噪比SNR的计算-Grayscale jpeg image compression, decompression, as well as the calculation of signal to noise ratio SNR
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对400幅灰度图像用分块PCA的方法进行压缩，进行通信时只用传输主元和特征向量。其中，pcaxiefangcha.m用于图像压缩，imresume.m用于图像恢复和部分图像的显示，chaweight.m用于绘制特征值比重-主元个数关系图，crdraw.m用于绘制压缩比-主元个数关系图，psnrdraw.m用于绘制总误差PSNR-主元个数关系图，psnrlocation.m用于绘制单幅图像误差PSNR分布图。-On the 400 block with a gray image compressi
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基于小波变换的图像压缩编码，实现了多种小波变换，并且实现了12:1的高压缩率。-Based on Wavelet Transform Image Coding, to achieve a variety of wavelet transform, and achieved a high 12:1 compression ratio.
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本程序使用C++编写，在VC2005上调试，完成了文件的读取，文件字符的统计以及压缩率的显示，哈夫曼树的建立，哈夫曼编码的实现，文件转换为哈夫曼编码成为压缩文件以及文件从压缩状态进行解码。并且以对话框的形式和用户交流，程序方便实用，既可以对文本进行压缩，有可以对图像进行压缩，效果都不错。-This procedure using C++ Prepared in VC2005 debug completed documents to read, document characters as wel
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How to find compression ratio of an uncompressed image as compared to compressed jpeg images.
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一種基于塊樹結構的SPIHT數字圖像壓縮算法: 在分析圖像經過小波變換后所具有的特性的基礎上,提出了一種改進的SPIHT算法.由于低頻系數占據圖像的百分之九十以上的能量,在圖像的重構中十分重要,所以,對這些系數不進行壓縮而直接傳輸 而最高頻系數相對不重要,所以不做處理,只在圖像重構時以指定的數值予以重構,因此不僅提高了圖像的質量,同時提高了圖像的壓縮率.在具體的算法中,提出了塊樹的結構,減少了算法所需的內存,拓寬了算法的應用范圍.-A tree structure based on the SP
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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 -
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此代码是小波零树算法的matlab实现程序，子程序较为齐全，包括最后计算压缩图像的峰值信噪比和压缩效果的源码。-This code is the wavelet zero-tree algorithm matlab implementation procedures, subroutines are more complete, including the final calculation of the peak signal to noise ratio and the compressed
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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
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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
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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
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fractal image compression of gray scale images....
only works for square images...
try with lena.bmp a gray scale one....
good compression ratio acheived
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Lossless image compression plays a very important role in image processing. However, it develops very slowly and it is difficult to improve the efficiency of compression, since complete information and high fidelity are demanded. The lossless compres
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自己编写的一个基于matlab的图像压缩程序，有GUI界面，不能程度的压缩效果以及信噪比。-His writing of a based on the matlab image compression program, a GUI interface, can t degree of compression effect and signal-to-noise ratio.
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DCT算法对图像进行压缩解压，并且计算压缩比-The DCT algorithm to calculate the compression ratio for image compression decompression
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Cosine transform compression, used for image compression, the compression ratio is high, and the quality of compressed image is still very good
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