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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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This a JPEG encoding & decoding program of still image. It does not use level shifting. Discrete Cosine transform (DCT) is performed both by classical & Chen s Flowgraph methods. Predefined JPEG quantization array & zigzag order are used here. RUN -
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基于DCT变换的二维图像压缩程序,在MATLAB中直接运行即可-Two-dimensional DCT-based image compression process can be run directly in MATLAB
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JPEG 静态图像压缩
各文件功能说明如下:
1) JPEG压缩程序:gendat.exe
2) 为压缩后的数据加上JPEG文件头的程序genjpg.exe
3) 解JEPG压缩程序extrdat.exe
其中:(1)的输入参量是需要生成的压缩文件的名字。
主程序流程为:
a) 程序初始化,读取文件名称、原始图像数据等基本数据;
b) 从AC.TAB和DC.TAB两个文件生成AC表和DC表,存入数组
c) 以8×8为样本单位进行DCT变换
d) 以8×8为
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Huffman and Shannon-Fano source coding
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基于cuda的dct图像压缩编码。要求:n卡,g80以上配置,支持cuda-Cuda-based image compression coding of dct. Requirements: n cards, g80 and above configurations, supporting cuda
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对图像信号进行DCT压缩和编码及加噪滤波后的恢复-DCT on the image signal compression and coding and increase the recovery of the filtered noise
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基于matlab的DCT图像压缩算法
(压缩效果对比)-DCT-based image compression algorithm matlab
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Implimentation of DCT based image compression
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JPEG图像压缩标准MATLAB仿真程序。包括DCT变换及其逆变换、量化及反量化等过程。-JPEG image compression standard MATLAB simulation program. Including the DCT transform and its inverse transform, quantization and inverse quantization and other processes.
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用Matlab实现用LOT算法对2D图像进行压缩,并和DCT算法压缩进行对比,使用图像为girl.jpg-Achieved by using Matlab LOT 2D image compression algorithm and compression algorithm and the DCT were compared, using images girl.jpg
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jpeg图像压缩编码程序,图像的DCT变换是调用Matlab自带的DCT变换函数dct来完成-jpeg image compression coding process, DCT transform is called the image that comes with Matlab DCT dct to complete the transformation function
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图像压缩算法,运用了DCT离散余弦变换,可以自己输入压缩系数-image compression
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The 8x8 discrete cosine transform (DCT) is widely used in image compression algorithm because of its energy compaction for correlated image pixels.
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利用子程序fast-lot.m,实现对该图像的变化及压缩,并和以为信号做dct后的图像质量相比较。-Using subroutine fast-lot.m, to achieve the changes and compression of the image, and after, and that the signals do dct compare the image quality.
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基于DCT离散余弦变换的JPEG数字图像压缩MATLAB程序。-Discrete cosine transform DCT-based JPEG image compression MATLAB.
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有损图像压缩的matlab程序实现,通过dct变换,霍夫曼编码,译码,比较压缩后图像与原图。-lossy image compression
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說明:DCT_JPEG_REAL 提供一個影像壓縮 用DCT的方式,裡面共7個檔案。-Descr iption: DCT_JPEG_REAL provide a way of image compression using DCT, which a total of 7 files.
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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 th
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本代码意在实现基于DCT的彩色图像和灰度图像的压缩,但解压部分还有待完善-DCT-based image compression
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