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提示: JPEG压缩分为三个部分: 1.JPEG压缩原理及算法(RGB/YCbCr,DCT/IDCT,量化,Z字型编码,用DPCM对DC/用RLE对AC编码/Huffman编码) 2.JPEG标记格式 3.JPEG图片文件的组织形式(位于SOS后的图像压缩数据是由MCU块怎样排列的,特别是使用了DRI之后) 还有许多细节问题: 1.解码过程中遇到“FF 00”当“FF”处理,否则忽略“FF” 2.进行DCT前YCbCr要减128,进行IDCT前要加128(相当于Y减128,YCbCr不需要加12
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对图像进行整数DCT变换,可用于无损压缩。-right image Integer DCT can be used lossless compression.
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Functions provided by the library
Outline of typical usage
Basic library usage:
Data formats
Compression details
Decompression details
Mechanics of usage: include files, linking, etc
Advanced features:
Compression parameter selection
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对原始信号做DCT的算法:Cox 和Piva 等人提出的DCT技术的经典之作。Cox利用随机数发生器产生标准正态序列作为水印信息对图像进行整体DCT变换后,选取除去DC系数之外部分较低频率系数叠加水印信息 Piva则修改整幅图像的中频部分。对原始信号分块后,再作DCT的算法:Hsu和Wu 把图像进行8*8分块,将一个二进制序列作为水印放入DCT的中频区;有些学者则计算整个图像的DCT,把一个实数序列嵌入DCT的中频系数上。选择中频区的好处是一方面尽量减少嵌入信息对图像主观视觉的影响;同时,尽量避
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DCT变换程序,将一组给定的8*8图像块经过DCT变换为另一个8*8矩阵,并计算输出压缩比。-DCT transform process, a given set of 8* 8 image block after DCT transform for another 8* 8 matrix, and calculate the output compression ratio.
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MFC 读取BMP图像信息,然后进行二维DCT变换,再量化,Z字型扫描,实现BMP到JPEG的转换-the encoding and decoding of JPEG and the specific realization of program on vc++ platform. The encoding part of this program can encode a picture whose format is BMP and save relevant data as binary
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通过DCT变换、量化、取值对bmp格式的灰度图像进行压缩编解码。-Through the DCT transform, to quantify the value of the gray image bmp format codec for compression.
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IT IS CODE FOR IMAGE COMPRESSION USING DCT IN MATLAB CODING
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8x8 DCT architecture for image compression
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此工程实现提取jpeg图像的DCT系数首字母概率作为jpeg重压缩检测的特征,以此特征训练出分类模板,可以检测出一张jpeg图像是单压缩还是重压缩。-Works to achieve this extract jpeg image DCT coefficients of the first letter of the probability of detection as a jpeg heavy compression feature, this feature trained classif
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dct变换 提高图像数据压缩 效果较好-Dct transform to improve the image data compression is better
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图像压缩编码码matlab实现:DM编码、变换编码、算术编码、行程编码、Huffman编码、线性预测编码-image compression coding matlab code to achieve. Including: DM coding, transform coding (FFT and DCT), arithmetic coding, Run-Length Coding, Huffman coding
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The discrete cosine transform (DCT) represents an image as a sum of sinusoids of varying magnitudes and frequencies and used in image compression applications. -The discrete cosine transform (DCT) represents an image as a sum of sinusoids of var
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这是一个基于DCT的图像压缩程序,本人加了一定的改动效果良好,喜欢的朋友可以研究研究-This is an image compression based on DCT program, I added a certain change effect is good, like friends can study
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通过DCT变换,进行DCT变换编码,进行图像压缩-Through the DCT transform, DCT transform coding, image compression
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DCT的图像压缩编码算法的应用基于MATLAB-image compression
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实现图像分块压缩感知,实现了多种稀疏基下的压缩感知,包含CT、DCT、DDWT、DWT等(Realize the image compression sense, and realize a variety of sparse base compressed sensing, including CT, DCT, DDWT, DWT and so on)
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MATLAB下图像处理-图像压缩,DCT变换及复原(Image processing - image compression, DCT transformation and restoration under MATLAB)
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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
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实现bmp图像的压缩编码解压,包括哈弗曼编码解码 dct变换 量化(Realize the BMP image compression coding decompression)
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