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jpeg视频编解码程序,包括dct变换、量化、vlc等过程,针对视频压缩-jpeg video codec procedures, including Extra transform, quantization, VLC and so on, for video compression
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已知两个不同图像块亮度数据如下:
(1)分析DCT原理,采用DCT方法,编程并计算相应的DCT系数,分析系数分布特点。
(2)依据视觉特性分析量化表步长的分布特点,完成DCT系数量化。
(3)采用Z形扫描,实现输出数据的统计编码,形成Video stream。
(4)采用IDCT重建图像亮度数据,计算SAD大小,分析产生误差的原因及采用DCT进行数据压缩的原理。( )
(5)分别利用左上角1、3、6个系数重建图像,计算相应的SAD,并由
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一个mpg压缩的水印提取程序,考虑到了几种压缩格式,并基于此提出DCT频率域上的水印提取.对学习视频水印的人有help-Mpg compressed a watermark extraction procedure, taking into account several types of compression formats, and based on this proposed DCT frequency domain watermark extraction. For learning
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实现图像压缩中的DCT变换,尤其是对于H.264视频标准中的DCT变换。-The realization of image compression in DCT transformation, especially for H.264 video standard DCT transform.
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H.264视频压缩代码中用线形汇编改写的dct、idct和quant\iquant部分-H.264 video compression using linear compilation of code to rewrite the dct, idct and part quantiquant
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为保证网络信息传输的安全性,提出一种视频图像加密方法。该方法引入混沌系统中的Logistic映射和
Baker映射,结合H·264视频压缩编码特点,利用Baker映射对DCT (Discrete Cosine Transform)变换量化后
的块进行位置置乱,
-In order to ensure the safety of information transmission network, and a video image encryption method. This met
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为保证网络信息传输的安全性,提出一种视频图像加密方法。该方法引入混沌系统中的Logistic映射和
Baker映射,结合H·264视频压缩编码特点,利用Baker映射对DCT (Discrete Cosine Transform)变换量化后
的块进行位置置乱,
-In order to ensure the safety of information transmission network, and a video image encryption method. This met
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三维DCT变换是在空间信息上增加了一维的时间维度,对视频系列直接进行压缩-Three-dimensional DCT transform information in the space are added to one-dimensional time dimensions of the video series for direct compression
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The following files give basic informations regarding DCT,JPEG,VIDEO and temporal compression schemes
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本文提出一种在原始视频DCT(离散余弦变换)与SVD(奇异值分解)域自适应嵌入水印的算法。算法首先将视频流分割成一个个场景,场景中的视频图像被变换到DCT-SVD域中,水印量化嵌入在最大奇异上,实现了水印盲检测。同时实验证明该算法在满足透明性要求下也满足一定的鲁棒性要求,能够抵抗低通滤波、中值滤波、椒盐噪声、高斯噪声、H.264压缩攻击以及统计攻击和帧剪切等攻击。-This paper presents an original video in the DCT (Discrete Cosine
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DCT变换在图像压缩中的实验
对视频的参考帧 和目标帧进行压缩的实验-DCT transform in image compression experiments on the video frames of reference frame and target compression experiments
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多种视频压缩算法,包括霍夫曼编码,算术编码dct,jpeg,小波变换-A variety of video compression algorithm, including Huffman coding, arithmetic coding DCT, jpeg, wavelet transform
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truncated DCT. good for video compression.
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基于matlab平台,通过DCT算法来对视频进行压缩。代码包括视频分解成帧,DCT算法压缩,帧合成视频,以及综合的视频压缩M文件,可以直接仿真。有相应的图片,以及压缩前后的视频,还有原理word报告。-Based on matlab platform, through DCT algorithm to compress the video. Code includes video decomposition framing, DCT compression algorithm, frame co
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iii) Discrete Cosine Transform
The transform of a signal is just another form of representing the signal. It does not change the information content present in the signal. Discrete cosine transform is widely used in image and video compression appl
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2D-DCT变换是视频压缩中的常用变换[2]。在压缩过程中,将一幅图像分成许多4*4的小块进行变换。-2D-DCT transform is often used in video compression transformation [2]. In the compression process, an image is divided into many small blocks of 4* 4 transform.
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Blocking artifacts continue to be among the most serious defects that occur in images and video streams compressed to low bit rates using block discrete cosine transform (DCT)-based compression standards (e.g., JPEG, MPEG, and H.263)
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用Verilog HDL编写的离散余弦变换,可用于视频图像压缩,并在modelsim SE6.0中仿真通过-Verilog HDL prepared with discrete cosine transform can be used for video image compression, and modelsim SE6.0 simulation through
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该图像压缩算法参考MG.Jordon博士发布的开源代码,作者对部分内容进行了优化,包括了帧内编码、帧间编码,DCT变换编码、自适应量化等。-The image compression algorithm reference Dr. MG.Jordon released the open source code, the author of some of the contents of the optimization, including the intra coding, inter fra
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Scalable MPEG compression based on DCT coefficient
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