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一种实用的数字图像压缩方法解振东,章三妹(成都理工大学信息工程学院,成都610059)摘 要:提出以C++Builder 6.0为开发平台,以其所提供的TJPEGImage为核心,实现真彩色图像的压缩,为工程实际的应用提供了一种非常实用的压缩手段。该方法减少了大量程序代码的编写工作。实验表明,当综合压缩比设为65时,压缩图像与原图像相比并无明显变化,由此可见,压缩效果令人满意。-a practical method of digital image compression solutions Z
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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
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对图像进行2维小波编码 来实现压缩。将小波分析引入图像压缩的范畴也是一个重要的手段,并且有着它自己的特点。它的特点在于压缩比高、压缩速度快,压缩后能保持信号与图像的特征基本不变,且在传递过程中可以抗干扰等等。(有两种方法)-of two-dimensional images wavelet compression coding to achieve. Wavelet Image Compression analysis of the introduction of the context is
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这是一个关于基于混合编码的图象压缩技术的实现,现在勉强可以实现关于小波的图象压缩实现。此程序可以将BMP格式的图象经压缩后以JPG的格式存储起来!压缩比一般可以达到32:1。还可以显示编码压缩所耗时间-This is a mixed coding on the basis of the image compression technology, and now can barely be achieved on wavelet image compression achieved. This p
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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 idea
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上传代码是经过修改的directshow例程amcap,增加了分辨率枚举,捕获图像,修改jpeg压缩比的功能。-This is a modified version of DirectShow demo, amcap, which has been added three functions, Resolution enumeration, capturing images, modifing jpeg compression ratio.
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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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我们知道,图像压缩就是要寻找高压缩比、并使压缩后的图像有合适的信噪比的方法,对压缩后的图像还要能实现低失真度地恢复图像。压缩性能的评价标准之一是图像能量损失和零系数成分值。能量损失越小,零系数成分值越大,图像压缩的性能就越高。
-We know that image compression is to find a high compression ratio, and the compressed image signal to noise ratio suitable metho
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利用霍夫曼编码对图像的冗余度进行压缩,以利于传输。采用霍夫曼编码来得到比较好的压缩比。-Use Huffman code redundancy of images compressed in order to facilitate transmission. Huffman code used to get relatively good compression ratio.
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可以实现图像霍夫曼编码,香家费诺编码,算术编码,游程编码,位平面编码,预测编码,在编码过程中会显示被压缩图像的各个参数(压缩比,码长,信噪比等),并有图像恢复功能.-Huffman code can achieve images, Fenno House Shannon coding, arithmetic coding, run-length coding, bit plane coding, predictive coding, in the process of encoding comp
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How to find compression ratio of an uncompressed image as compared to compressed jpeg images.
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MPEG4是一种压缩率高、对传输带宽要求低、图像质量高的图象编码技术。提出了一套视频传输系统的实现方案。该方案基于OMAP1510具有的独特双核结构,结合蓝牙和MPEG4编码技术,实现窄带宽下的视频图像实时传输。-MPEG4 is a high compression ratio, and low transmission bandwidth, high image quality image coding techniques. A set of video transmission syst
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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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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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对图像进行Huffman编码并计算其压缩比-Huffman coding of images and calculate the compression ratio
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Digital maps can best stored and distributed electronically using compressed raster image formats.We introduce as to rage system for the
map images that supports compact storage size,decompression of partial image,and smooth transitions between var
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利用Matalab软件分别编写子函数实现数字图像压缩及解压缩处理,并统计分析压缩处理算法所能够实现的压缩比及解压图像和原始图像间的均方根误差。-Functions were written by Matalab software for digital image compression and decompression processing, and statistical analysis of compression algorithms to achieve the compressi
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实现了单色图像的JPEG2000编码图像和解码图像!计算其压缩比和误差,观察源图像和重构图像之间的差别!-JPEG2000 images to achieve a monochrome image coding and decoding image! Calculate the compression ratio and error, observation of the source image and the difference between the reconstructed imag
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I have thoroughly study the basic of image compression techniques. From that I have selected SPIHT algorithm for my research work. I have implemented on image compression for gray images using SPIHT algorithm. Image compression is implemented using t
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将256级灰度的大小为256×256的灰度图像完成DCT变换压缩,压缩比为8 :1。实现图像压缩功能。-256 levels of gray size is 256 × 256 grayscale images to complete the DCT compression, the compression ratio of 8: 1. Image compression function.
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