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Description: jpeg中DCT变换程序。为前向DCT的浮点运算，它要比整数运算更精确。该程序只适用于8×8的块变换。-jpeg DCT transformation procedure. For front to the DCT
floating point calculation, it must be more precise than the integer
operation. This procedure is only suitable for 8脳8 block
transformation.
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Size: 1288 |
Author: canny06 |
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Description: This file contains a new and improved version of the Huffman coder, (June 29. 2001). The name is Huff06.m. There are also some additional files which are helpful when using Matlab for data compression: quantizer, different variants of run-length-encoding and end-of-block coding in Mat2Vec, and a program which do JPEG-like entropy coding. A complete compression example is shown in TestMat2Vec.m. This file is all you need for Huffman coding in MatLab.-This file contains a new and improved version of on of the Huffman coder, (June 29. 2001). The name is Huff06.m. There are also some additional files which are helpful wh en using Matlab for data compression : quantizer. different variants of run-length-encoding an d end-of-block coding in Mat2Vec. and a program which do JPEG-like entropy coding . A complete compression example is shown in Tes tMat2Vec.m. This file is all you need for Huffma n coding in MatLab.
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Size: 25410 |
Author: 金金 |
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Description: 子块DCT变换编码/帧内预测编码DPCM，基于JPEG量化矩阵的量化与反量化-block DCT encoding / decoding predictive coding DPCM. JPEG quantization matrix based on the quantitative and anti - quantization
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Size: 1597 |
Author: 田彬 |
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Description: 一种基于感知模型的盲水印算法 ：根据Watson模型，结合仿射变换置乱技术和DCT量化系数奇偶特性，本文提出了一种在分块DCT中频交流系数中嵌
入有含义二值水印图像，以实现盲检测的水印方案。实验结果表明，该算法对于JPEG有损压缩、图像剪切等处理有很强的
鲁棒性。-a model based on the perception of the blind watermarking algorithm : According to Watson model, with affine transformation Scrambling Technology and DCT coefficient quantization Parity characteristics, This paper presents a block in exchange DCT coefficient meaning embedded in a binary image watermarking, Blind to achieve the watermark detection program. Experimental results show that the algorithm for JPEG lossy compression, image processing shear is very robust.
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Size: 225358 |
Author: ghostsx |
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Description: 1 记忆测试软件 主类Memory 方块 Block 记忆测试板MemoryTestPane 显示成绩 ShowRecord 记录成绩 Record 随机排列图标 RandomSetIcon 测试者 People 2 计算器 主类 ComputerPad 数值按钮NumberButton 运算符号按钮OperationButton 3 HANNOI-塔 主类 Tower Hannoi-塔 HannoiTower 塔点 TowerPoint 盘子 Disk 4 JPEG图象生成器 主类 MakeJPEG.java 5 标准化考试系统 (单机版) 主类EnglishTest 考试区域TestArea 读取试题 ReadTestquestion
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Size: 27752 |
Author: kuraxkillua@163.com |
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Description: jpeg中DCT变换程序。为前向DCT的浮点运算，它要比整数运算更精确。该程序只适用于8×8的块变换。-jpeg DCT transformation procedure. For front to the DCT
floating point calculation, it must be more precise than the integer
operation. This procedure is only suitable for 8脳8 block
transformation.
Platform: |
Size: 1024 |
Author: canny06 |
Hits:
Description: This file contains a new and improved version of the Huffman coder, (June 29. 2001). The name is Huff06.m. There are also some additional files which are helpful when using Matlab for data compression: quantizer, different variants of run-length-encoding and end-of-block coding in Mat2Vec, and a program which do JPEG-like entropy coding. A complete compression example is shown in TestMat2Vec.m. This file is all you need for Huffman coding in MatLab.-This file contains a new and improved version of on of the Huffman coder, (June 29. 2001). The name is Huff06.m. There are also some additional files which are helpful wh en using Matlab for data compression : quantizer. different variants of run-length-encoding an d end-of-block coding in Mat2Vec. and a program which do JPEG-like entropy coding . A complete compression example is shown in Tes tMat2Vec.m. This file is all you need for Huffma n coding in MatLab.
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Size: 25600 |
Author: 金金 |
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Description: 子块DCT变换编码/帧内预测编码DPCM，基于JPEG量化矩阵的量化与反量化-block DCT encoding/decoding predictive coding DPCM. JPEG quantization matrix based on the quantitative and anti- quantization
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Size: 1024 |
Author: 田彬 |
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Description: 一种基于感知模型的盲水印算法 ：根据Watson模型，结合仿射变换置乱技术和DCT量化系数奇偶特性，本文提出了一种在分块DCT中频交流系数中嵌
入有含义二值水印图像，以实现盲检测的水印方案。实验结果表明，该算法对于JPEG有损压缩、图像剪切等处理有很强的
鲁棒性。-a model based on the perception of the blind watermarking algorithm : According to Watson model, with affine transformation Scrambling Technology and DCT coefficient quantization Parity characteristics, This paper presents a block in exchange DCT coefficient meaning embedded in a binary image watermarking, Blind to achieve the watermark detection program. Experimental results show that the algorithm for JPEG lossy compression, image processing shear is very robust.
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Size: 225280 |
Author: ghostsx |
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Description: QccPackSPECK-0.54-1 (release 2007-04-30) is The Set-Partitioning Embedded Block (SPECK) algorithm for wavelet-based image coding. -QccPackSPECK- 0.54-1 (release 2007-04-3 0) is The Set-Partitioning Embedded Block (SPE CK) algorithm for wavelet-based image coding.
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Size: 49152 |
Author: jason.. |
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Description: 提出一种基于视觉特性的图像摘要算法，增大人眼敏感的频域系数在计算图像Hash时的权重，使得图像Hash更好地体现视觉特征，并提高鲁棒性。将原始图像的分块DCT系数乘以若干由密钥控制生成的伪随机矩阵，再对计算的结果进行基于分块的Watson人眼视觉特性处理，最后进行量化判决产生固定长度的图像Hash序列。本算法比未采用视觉特性的算法相比，提高了对JPEG压缩和高斯滤波的鲁棒性。图像摘要序列由密钥控制生成，具有安全性。-Based on the visual characteristics of the image digest algorithm, increasing the human eye-sensitive frequency-domain coefficients in the calculation of the image when the weight of Hash, Hash makes images better reflect the visual characteristics, and improve robustness. Will block the original image multiplied by the number of DCT coefficients generated by the key control of pseudo-random matrix, then the results of calculation based on the sub-block of Watson HVS treatment, and finally quantify the judgments arising from fixed-length sequence of images Hash . Than the algorithm did not use the visual characteristics of the algorithm, improve the JPEG compression and Gaussian filtering robustness. Abstract image sequence generated by the key control, with security.
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Size: 167936 |
Author: kurt |
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Description: jpeg压缩的matlab程序，包括分块，量化，霍夫曼编码，其中量化和霍夫曼编码用查表实现，提高速度。-jpeg compression matlab procedures, including block, quantization, Huffman coding, in which quantization and Huffman coding using look-up table to achieve, improve the speed.
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Size: 1118208 |
Author: ronghy |
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Description: 编程实现基于8×8子块的DCT图像变换，基于JPEG量化矩阵的量化与反量化，基于8×8子块DCT的图像重建；以一幅512×512、8比特/象素的图像为实验对象，计算重建后的PSNR。-Programming based on 8 × 8 sub-block of the DCT image transform, quantization matrix based on the JPEG quantization and anti-quantitative, based on the 8 × 8 sub-block DCT of the image reconstruction to a 512 × 512,8 bits/as Su-image for the experiment, re-calculation of PSNR.
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Size: 111616 |
Author: zfyplay |
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Description: 本论文首先系统地介绍了视频压缩编码的基本原理和方法，以及各国际标准
化组织提出的压缩标准；其次分析了JPEG和MPEG-4的主要技术，据此提出
MPEG-4简单框架编码器的软件实现方案，给出流程图，在VC++环境下用C语言
程序实现了JPEG压缩及MPEG-4简单框架的视频压缩功能，采用测试序列验证
无误，并对两种标准的压缩比进行试验对比，突出压缩的关键技术为DCT和运动
估计算法；接着深入研究了DCT变换、运动估计和补偿算法并进行了优化改进，
给出了用于快速匹配块的自适应十字模式搜索算法，并给出了对各种块匹配估计
算法的仿真结果。然后详细介绍了TI公司TMS320C6711DSP的软硬件特性，并
在此基础上提出系统的硬件实现方案。接着介绍了基于系统软硬件环境的移植问
题和优化方法，并针对算法移植和仿真过程中的问题进行了说明。
最后就课题设计过程中研究的结果予以总结，并阐述了以后课题研究的要点。-In this thesis,an introduction to video compression principal,methods and central
international video coding standards is done firstly.Then analyzing the core techniques
of JPEG and MPEG-4 and proposing a scheme of MPEG-4 SP encoder,the coding
function of JPEG and MPEG-4 is achieved in C successfully with test sequence Then
compare the compressed ratio of two standards,point out the key of compression is DCT
and Motion Estimation algorithm.Afterwards,studying the DCT/Motion
Estimation/Motion Compensation algorithm in detail and giving an adaptive rood
pattern search for fast Block-Matching motion estimation.Then the simulation of several
motion estimation algorithms based block-matching is given.Accordingly,a scheme of
a DSP-based video compression system is put forward,with the features of TI’s
TMS320C6711 DSP.At last,the transplant and optimization are considered on the basis
of soft and hard environments,also the simulation process.
In the end,the summarization about the
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Size: 1805312 |
Author: father2002 |
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Description: block diagram of jpeg encoder
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Size: 381952 |
Author: Goli.Shiva |
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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.
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Size: 175104 |
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Description: Jpeg blocking effect study
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Size: 342016 |
Author: shikha |
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Description: 在MATLAB平台上实现JPEG图像的编码解码。可以正常运行，可以调整压缩的比率，分块编写，清晰方便阅读-JPEG image codec in MATLAB platform. Normal operation, you can adjust the compression ratio, written in block, clear and easy to read
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Size: 1911808 |
Author: sunflower |
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Description: JPEG编码(基于子块DCT变换编码，什么是量化，体验DCT系数（直流系数、交流系数）以及量化步长对图像的影响)-JPEG encoding (based on sub-block DCT transform coding, what is quantitative, experience DCT coefficients (DC coefficient and AC coefficient) and quantization step size affect the image)
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Size: 128000 |
Author: wuxiaojuan |
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Description: 将图片分割成8*8的块然后进行DCT和量化，编码及解码(For further improvement each 8x8 block of the difference image can be transformed using a 2D DCT before
quantizing and coding)
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Size: 3072 |
Author: Jessicapu |
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