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Description: 对原始灰度图像 Lena_gray.bmp进行图像压缩实验
1．对此图进行 8×8 DCT 变换后，分别只保留 DC系数，以及保留前 4、8、16 个变换系数(DC＋AC) ，然后再分别进行 IDCT 变换，比较结果。
2．可以使用 Matlab - Image Processing Toolbox 中的函数实现。
-gray image of the original image compression Lena_gray.bmp an experiment. This diagram 8 8 DCT, the only difference reservations DC coefficient, and the preservation of the former 4, 8 or 16 DCT coefficients (DC+ AC), and then separately IDCT transformation, the results of the comparison. 2. Using Matlab-Image Processing Toolbox to achieve the function.
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Size: 1024 |
Author: 朱晓路 |
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Description: 这是用VHDL语言(硬件描述语言)写的一个二维
8*8块的离散余弦变换(DCT)以及反变换(IDCT).全同步设计,低门数.可以用于多媒体及打印应用领域.-VHDL (hardware description language) wrote a two-dimensional 8* 8 discrete cosine transform (D CT) and the anti-transform (IDCT). fully synchronous design, low gate count. can be used for multimedia and print applications.
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Size: 32768 |
Author: citybus |
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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: 1024 |
Author: canny06 |
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Description: 这是一个二维 8*8块的离散余弦变换(DCT)以及反变换(IDCT)算法,采用VHDL实现-This is a two-dimensional 8* 8 discrete cosine transform (DCT) and inverse transform (IDCT) algorithms using VHDL realize
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Size: 10240 |
Author: liujl |
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Description: 能进行8*8的快速DCT变换并反变换，显示变换前和变换后的图象。可自由选择保留几个DCT变换后的系数-Can be 8* 8 Fast DCT transform and inverse transform, showing transformation before and after the image transformation. Be free to choose to retain a few DCT transformed coefficients
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Size: 4377600 |
Author: 李莉 |
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Description: 将一副256*256的灰度图像分成8*8的小图像块，然后进行dct变换-Will be a 256* 256 gray image is divided into 8* 8 small image blocks, and then proceed to DCT transform
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Size: 389120 |
Author: 笨笨 |
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Description: 基于8*8分块的DCT域水印嵌入算法水印图像为64*64的，原始图像为256*256的，把原始图像变成64*1024的-Based on 8* 8 sub-block DCT domain watermark image watermark embedding algorithm is 64* 64, the original image is 256* 256, and the original image into 64* 1024
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Size: 1024 |
Author: 张婷婷 |
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Description: 使用DCT算法实现8X8的BMP图像压缩的一个源代码，希望对大家有用~-8x8 algorithm using DCT image compression of BMP, a source code, in the hope that useful to everyone ~
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Size: 3072 |
Author: viconia |
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Description: 将图像做成8*8矩阵，然后通过DCT矩阵实现DCT变换的算法-The image into 8* 8 matrix, and then realize DCT transform matrix DCT algorithms
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Size: 1024 |
Author: wang zhuo |
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Description: dctcom.m文件利用DCT变换完成对输入图像进行压缩；imagecbe.m完成对输入的两幅RGB图像用小波分析的方法进行图像融合 imagecom.m完成对输入的RGB图像用小波分析的方法进行自动降噪，得到高频系数阈值，降噪效果百分比和结果 wavelet1D.m完成对输入的一维信号进行多尺度离散小波分解 wavelet2D完成对输入的二维信号进行多尺度离散小波分解；zigzag.m完成对输入的8*8矩阵按照zigzag排列抽取数据.-document the use of DCT transform dctcom.m completion of the input image compression imagecbe.m completion of the two RGB input image with wavelet analysis method of image fusion imagecom.m completion of the input RGB image using wavelet analysis method automatically drop noise, the threshold of high-frequency coefficient, noise reduction effect and the results of the percentage of wavelet1D.m completion of the input signals of one-dimensional discrete wavelet multi-scale decomposition wavelet2D completion of the input signals of two-dimensional discrete wavelet multi-scale decomposition zigzag.m completed the input of 8* 8 matrix of data collected in accordance with the zigzag order.
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Size: 3072 |
Author: zhouhao |
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Description: 8*8矩阵dct变换以及量化 反量化和反dct变换-8* 8 transform and quantization matrix dct quantization and anti-anti-dct transform
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Size: 1024 |
Author: 刘洋 |
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Description: 利用DCT进行图像压缩（首先将图像分割成8×8的图像，对每个子图像进行DCT，这样每个子图像有64个系数，舍去50％小的变换系数，进行2：1的压缩。）-The use of DCT for image compression
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Size: 218112 |
Author: nn |
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Description: 本人根据公式用VC++做出的DCT变换源码，解说清楚。转换矩阵8*8，计算结果与MATLAB计算结果比较，两者几乎一样(相差仅 0.001)，估计是计算误差，经过我的实践证明并不影响使用。-According to the formula I use VC++ source code to the DCT transform, to clarify. Conversion matrix 8* 8, the calculation results compared with the MATLAB calculation results, the two are almost identical (a difference of only 0.001), it is estimated that the calculation error, after I prove that the practice does not affect use.
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Size: 1024 |
Author: 公孙小龙 |
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Description: 利用matlab的DCT2函数，对图像做变换并压缩。并用8*8对图像分块，对每一块计算均方值作为阈值。-DCT2 use the matlab function, and transform the image so compressed. And 8* 8 image block, a calculation of each mean square value as a threshold.
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Size: 1024 |
Author: 马丁 |
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Description: 一个实用的对8×8的图像做DCT变换的源代码-A practical image of the 8 × 8 to do the source code for DCT-
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Size: 563200 |
Author: 飞天 |
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Description: 将图象分块(8*8)，作DCT变换，并作IDCT：DCT是一种可分离图象变换，用来图象压缩编码，IDCT用来解压缩。-The image sub-block (8* 8) for the DCT transform, and to make IDCT: DCT is a separable image transformations, is used to image compression coding, IDCT is used to decompress.
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Size: 7168 |
Author: zy |
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Description: 在一个图像块中调整两个(或多个) DCT系数的相对大小。将描述一个使用数字图像作为载体的系统。在编码处理中，发送者将载体图像分成8×8的像素块，每一块只精确地编码一个秘密信息位。嵌入过程开始时，首先伪随机地选择一个图像块bi，用它对第i个消息比特进行编码。令Bi=D{bi}为DCT变换后的图像块。
在通信开始前，发送者和接收者必须对嵌入过程中使用的两个DCT系数的位置达成一致，让我们用(u1,v1)和(u2,v2)来表示这两个索引。这两个系数应该相应于余弦变换的中频，确保信息保存在信号的重要部位(从而使嵌入信息不容易因JPEG压缩而完全丢失
-abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwx
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Size: 1526784 |
Author: ljh |
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Description: 读入一幅256*256图像，将它分成8*8pixel的若干块，对每块做DCT变换，保留Z型顺序的若干变换系数，进行IDCT重构图像，计算重构图像的信噪比-Reading a 256* 256 image, it will be divided into several blocks of 8*8 pixel, keep each optimal Z transformation of sequence number, IDCT transform coefficient calculation reconstruction image reconstruction images,and the signal-to-noise ratio
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Size: 3072 |
Author: jiangxin |
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Description: ce code permet de cacluler les coefficiants de la dct dans un block 8*8 aisni selectionner les coefficients par un balyage zigzag
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Size: 4096 |
Author: sarah |
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Description: DCT 8*8 4:2:0 Quantization
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Size: 2048 |
Author: jimmy |
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