Description: 缩包的内容包括：1.有关JPEG和DPCM算法的文章；2.实现其算法的压缩程序3.有关图像压缩方面的资料-shrinking package contents include : 1. DPCM the JPEG algorithm and the article; 2. achieve its compression algorithm procedures 3. Image compression of the information Platform: |
Size: 80800 |
Author:李云 |
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Description: 缩包的内容包括：1.有关JPEG和DPCM算法的文章；2.实现其算法的压缩程序3.有关图像压缩方面的资料-shrinking package contents include : 1. DPCM the JPEG algorithm and the article; 2. achieve its compression algorithm procedures 3. Image compression of the information Platform: |
Size: 80896 |
Author:李云 |
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Description: 本文是用线形预测编码对图像进行压缩，这种方法是中无损压缩-This article is a linear prediction coding of image compression, this method is in the lossless compression Platform: |
Size: 1024 |
Author:fayegyf |
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Description: 该程序主要实现图像的无损压缩，具体算法包括：
（1）整数小波变换＋SPIHT无损压缩
其中整数小波可以采用JPEG2000提供的5－3小波，也可以采用S＋P变换，本程序均已给出。
（2）DPCM＋算术编码
DPCM采用的是JPEG中采用的方法；
（3）JPEG－LS标准
JPEG－LS的无损压缩性能非常好，超过JPEG2000。-The program mainly realize lossless image compression, the specific algorithm include: (1) integer wavelet transform SPIHT Integer Wavelet lossless compression which can be used to provide the 5-3 wavelet JPEG2000, can also adopt the S P transform, the procedures are given. (2) DPCM arithmetic coding DPCM is used in JPEG methodology (3) JPEG-LS standard JPEG-LS lossless compression of very good performance, more than JPEG2000. Platform: |
Size: 103424 |
Author:yang |
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Description: 差分脉冲编码：通信工程中经常用到的一个实用算法。这里是matlab的实现。-Differential pulse code: Communications Engineering frequently used for a practical algorithm. Here is the realization of matlab. Platform: |
Size: 1024 |
Author:tao lan |
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Description: 摘 要
文章以空间监控系统为背景,深入研究了JPEG图像压缩标准的实现方法,并基于FPGA对其进行了实现和优化。文中给出了详细的实现方法和优化过程,测试表明达到了很好的效果。
简单介绍了有损静态图像压缩当前有两种比较流行的标准JPEG和JPEG2000。说明了用JPEG方法压缩的原因。
介绍JPEG基本原理：JPEG对灰度图像的压缩处理过程主要包括:图像分割,离散余弦变换(DCT),量化(Quantization),“Z”形排序(Zigzag Scan),差分脉冲编码调制(Differential Pulse Code Modulation,DPCM)对直流系数(DC),行程长度编码(Run-Length Encoding,RLE)对交流系数(AC),霍夫曼(Huffman)编码等。
JPEG标准的特点是离散余弦变换。
比较详细介绍压缩系统的构成和实现。实现提及步骤， JPEG压缩模块设计和编码模块实现细节。
-Abstract
Article in the space monitoring system for the background, in-depth study of the JPEG image compression standard implementation methods and carried out based on FPGA implementation and optimization. In this paper, a detailed method of implementation and optimization of the process, testing showed that to achieve good results.
Easy introduction of harmful static image compression has two kinds of comparisons that the current popular standard JPEG and JPEG2000. Illustrated by the reasons for JPEG compression method.
JPEG introduce the basic principles: JPEG compression of gray-scale image processing include: image segmentation, discrete cosine transform (DCT), quantization (Quantization), "Z"-shaped sort (Zigzag Scan), differential pulse code modulation (Differential Pulse Code Modulation, DPCM) on the DC coefficient (DC), Run Length Encoding (Run-Length Encoding, RLE) of the exchange coefficient (AC), Hoffman (Huffman) coding.
JPEG standard is characterized by discrete Platform: |
Size: 523264 |
Author:压子 |
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Description: 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 compression ratio of the conventional methods is around 2:1 and 3:1, which doesn’t satisfy practical compression needs. So, it is necessary to develop more efficient lossless image compression methods. Platform: |
Size: 15360 |
Author:rupesh |
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Description: 压缩包的内容包括：1.有关JPEG和DPCM算法的文章；2.实现其算法的压缩程序3.有关图像压缩方面的资料。读者请注意：
<1>这里讨论的是灰度图像的压缩不涉及彩色图像。
<2>实现压缩时，输入的图像数据采用一种自定义的格式（com 格式），前四个字节记录图像的宽度和高度，之后就是逐
行的图像数据，图像的开头和结尾没有任何标记。这种格式的图像数据是从BMP图像中得到的。
<3>这里没有JPEG算法的解压程序，压缩后的数据存成标准的JPEG文件格式，任何视图软件都可以打开。DPCM方法中的解
压缩程序将数据仍然存成com格式，可以将其转成PGM格式观看，压缩包中由com转为PGM格式的程序。
<4>所有的C程序均是在Linux（Rethat7.3)下完成。-Compressed package includes: 1. The JPEG and DPCM algorithm article 2. To achieve its compression algorithm procedure 3. The image compression information. Readers please note:
<1> discussed here is the gray image compression does not involve color images.
<2> to achieve compression, the input image data using a custom format (com format), record the first four bytes of the image width and height, and then is gradually
Line of image data, image mark the beginning and no end. This format of image data is obtained from the BMP image.
<3> There are no procedures for JPEG decompression algorithm, compressed data stored as a standard JPEG file format, you can open in any view. DPCM method of solution
Compressed program data is still stored as com format, you can watch it turn into a PGM format, compressed in the com format to PGM program.
<4> All the C programs are in Linux (Rethat7.3) to complete. Platform: |
Size: 1811456 |
Author:shikaichang |
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Description: 本代码由matlab语言编写，实现了jpeg算法，主要为了说明基本的JPEG功能。经过DCT变化，量化，进行DPCM编码，然后之字形扫描AC系数，进行行程（LZW）编码。 显示原始图象和经编码解码后的图象，显示压缩比，并计算均方根误差。-The code consists of matlab language, to achieve a jpeg algorithm, mainly to illustrate the basic functionality of JPEG. After changing DCT, quantization, for DPCM coding, then the AC coefficients of the zigzag scanning, for stroke (LZW) coded. Shows the original image and the encoded decoded image showing the compression ratio, and calculate the mean square error. Platform: |
Size: 5120 |
Author:wyd |
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Description: VC++图像处理及源码包（大全）包括下列内容：1.数字图像获取，处理及实践应用电子书 2.数字图像获取，处理及实践应用电子书分章节源码 3.书中提及的各种算法的综合源码。压缩包里面包括的算法代码有：分章节源码内容：内容：对比度增强、灰度变换法、直方图修整法、图像平滑、图像锐化、伪彩色和假彩色增强；逆滤波复原、维纳滤波方法；傅立叶变换、离散余弦变换（DCT）、沃尔什变换、基于特征向量的变换、霍特林（Hotelling）变换、SVD变换、小波变换、Mallat算法；霍夫曼（Huffman）编码、算术编码、游程编码（Run Length Coding）、位平面编码、预测编码、DPCM、JPEG 2000编码；骨架检出、轮廓提取；边界跟踪、阈值分割区域生长、分裂合并、 Canny算子；图像的模式识别。各种算法的综合源码：原图、抖动，灰度变换、直方图均衡、多种滤波器、伪彩色增强，运动模糊、逆滤波，傅立叶变换、快速傅立叶变换、离散余弦变换、沃尔什变换、霍特林变换、小波变换、小波反变换，霍夫曼编码、香浓-费诺编码、算术编码、位平面编码，图像识别。(Visual C++ image processing and source code package (Daquan) includes the following contents: 1. Digital image acquisition, processing and practical application of e-book 2. Digital image acquisition, processing and practical application of e-book chapter source code 3. The comprehensive source code of various algorithms mentioned in the book. The algorithm codes included in the compression package include: Chapter Source Code: Content: Contrast Enhancement, Gray Level Transform, Histogram Renovation, Image Smoothing, Image Sharpening...) Platform: |
Size: 15010816 |
Author:jhanker |
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Search - dpcm image compression