Description: 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 Zhendong, Chapter Sanmei (Chengdu University of Technology and Information Engineering College, Chengdu 610059) Abstract : C Builder 6.0 development platform to the provision of core TJPEGImage to achieve true color image compression. for the practical application provides a very practical means of compression. The ways to reduce the large number of code-writing. Experiments show that when integrated compression ratio is set to 65 hours, compressed images compared with the original image and no noticeable change, it can be seen that Compression satisfactory. Platform: |
Size: 269331 |
Author:ghostsx |
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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 . Platform: |
Size: 3674 |
Author:陈语恬 |
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Description: 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 also an important means, it has its own characteristics. It features is the compression ratio, faster compression, the compressed signal can be maintained with the image of the same basic features, and the transfer process can be interference, etc.. (There are two methods) Platform: |
Size: 3115 |
Author:郭指挥 |
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Description: 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 procedure can be BMP format images compressed by the JPG format to store up! Compression ratio generally can be reached 32:1. It also shows the time taken Coding Platform: |
Size: 60879 |
Author:宦夏 |
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Description: 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 procedure can be BMP format images compressed by the JPG format to store up! Compression ratio generally can be reached 32:1. It also shows the time taken Coding Platform: |
Size: 60416 |
Author:宦夏 |
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Description: 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 Zhendong, Chapter Sanmei (Chengdu University of Technology and Information Engineering College, Chengdu 610059) Abstract : C Builder 6.0 development platform to the provision of core TJPEGImage to achieve true color image compression. for the practical application provides a very practical means of compression. The ways to reduce the large number of code-writing. Experiments show that when integrated compression ratio is set to 65 hours, compressed images compared with the original image and no noticeable change, it can be seen that Compression satisfactory. Platform: |
Size: 269312 |
Author:ghostsx |
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Description: 提出了一种基于 JPEG/JPEG2000相结合的医学图像感兴趣区域压缩方法。该方法对在人为选定
医学图像的感兴趣区域采用无损的 JPEG2000压缩 ,而对其他图像区域则采用高压缩比的 JPEG压缩,较好地解决了医学图像的高压缩比和高质量之间的矛盾。-Based on a combination of JPEG/JPEG2000 region of interest of medical image compression method. The method of artificially selected region of interest of medical images using lossless JPEG2000 compression, and on other image regions using high compression ratio of JPEG compression, a better solution to the medical image and high-quality high-compression ratio between the contradictions. Platform: |
Size: 283648 |
Author:胡敏 |
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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: JPEG压缩技术十分先进，它用有损压缩方式去除冗余的图像数据，在获得极高的压缩率的同时能展现十分丰富生动的图像，换句话说，就是可以用最少的磁盘空间得到较好的图像品质。而且 JPEG是一种很灵活的格式，具有调节图像质量的功能，允许用不同的压缩比例对文件进行压缩，支持多种压缩级别-JPEG compression technology is very advanced, it uses lossy compression methods to remove redundant image data, in access to high compression ratio at the same time able to show very rich and vivid images, in other words, can at least get more disk space good image quality. And JPEG is a very flexible format, with the image quality adjustment function, allowing the compression ratio with different file compression, supports a wide range of compression level Platform: |
Size: 1024 |
Author: 程凯 |
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Description: 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 method for compressed images also can realize low-distortion image restoration. Compression performance evaluation criteria is one of image and zero energy loss coefficient of component values. The smaller the energy loss, the greater the value of a zero coefficient components, image compression the higher the performance. Platform: |
Size: 5120 |
Author:梁明 |
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Description: 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. Platform: |
Size: 939008 |
Author:liuyaxin |
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Description: 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 compressed image will show the various parameters (compression ratio, code length, SNR, etc. ), and there is image restoration functions. Platform: |
Size: 231424 |
Author:yangjianlei |
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Description: How to find compression ratio of an uncompressed image as compared to compressed jpeg images. Platform: |
Size: 121856 |
Author:mmq |
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Description: 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 system for the program. The program is based on the unique OMAP1510 dual-core structure, combined with Bluetooth and MPEG4 encoding technology, the realization of narrow-bandwidth real-time transmission of video images. Platform: |
Size: 549888 |
Author:王硕亮 |
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Description: 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 SPIHT block of digital image compression algorithm: After the analysis of images after the wavelet transform features, based on a modified SPIHT algorithm. Due to the low frequency coefficient images occupy more than 90 percent of energy in image reconstruction is very important, so these factors do not directly transfer compression The most high-frequency coefficient is relatively unimportant, so no treatment, only when the image reconstruction be designated numerical reconstruction therefore not only improve the image quality, while improving the image compression ratio. algorithms in specific, the proposed block-tree structure, the algorithm to reduce memory requirements and broaden the scope of application of the algorithm. Platform: |
Size: 273408 |
Author:jason.. |
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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: Digitized images have replaced analog images as photographs or x-rays in many different fields. In their raw form, digital images require a tremendous memory capacity for storage and large amount of bandwidth for transmission. In the last two decades, many researchers have been devoted to develop new techniques for image compression. More recently, wavelets have become a cutting edge technology for compressing the images by extracting only the visible elements. In this paper a wavelet based image decomposition algorithm has been implemented. Also, a nonuniform threshold technique based on average intensity values of pixels in each sub band has been proposed to remove the insignificant wavelet coefficients in the transformed image. Experimental results are obtained to compare the Daub2, Daub3 and Daub4 compactly supported (Daubechies) orthogonal wavelets on various test images using two important performance parameters – compression ratio and PSNR Platform: |
Size: 281600 |
Author:Sid |
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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: 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 this algorithm has better result over the previous result on gray images and also improved PSNR value high but on other side low result on compression ratio.
Platform: |
Size: 416768 |
Author:shrey211 |
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Description: 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. Platform: |
Size: 1024 |
Author:赵雨桐 |
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Search - compression ratio of images