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Description: 由于二维DCT变换是对数字图像矩阵而言的，所以对于RGB位图不能进行DCT变换我在这里先将它转换成灰度图像再把水印嵌入到灰度图像中来进行基于DCT变换的图像水印研究。
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Size: 1694 |
Author: chf068 |
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Description: 实现jpeg图像解码功能。
代码设计思路：1, Reconstruct the Huffman/RLE stream to a sequence
2, Arrange the sequence to a matrix using the zigzag scanning backwards
3, Multiply the matrix by quantization table
4, Perform inverse DCT
5, Shift the values by +128
6, Transform back to RGB color space
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Size: 186880 |
Author: 颜新卉 |
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Description: (1)将整幅图像分成4×4块，计算每一块中所有象素RGB三个颜色通道的颜色平均值，并以此作为该块的代表颜色（主颜色）。
(2)将各块的颜色平均值进行离散余弦变换（DCT），得到DCT系数矩阵。DCT是一种分离的变换，是国际静止图像压缩标准JPEG的基础。由于大多数图像的高频分量较小，相应于图像高频分量的系数经常为零，加上人眼对高频成分的失真不太敏感，所以可用更粗的量化。因此，在一般检索中可以利用部分DCT系数作为特征向量。
(3)对DCT系数矩阵进行之字形扫描和量化，得到DCT系数。
(4)对于R、G、B三个通道，分别从DCT系数中取出4个低频分量，形成12个参数，共同构成该图像的颜色特征向量。
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Size: 2836494 |
Author: riddick |
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Description: mylsb.m is a very complete source of LSB Steganography Steganography and extraction, and are on the inside, I did not upload pictures, you only need to add a picture file on it, remember the image must be a grayscale image, if it is RGB, I converted the code is also very interesting inside Oh. weipingmian.m is a program to extract bit-plane images, pictures, you also need to load the last one is 8 * 8 DCT transformed image.
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Size: 1641 |
Author: richardwn |
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Description: 由于二维DCT变换是对数字图像矩阵而言的，所以对于RGB位图不能进行DCT变换我在这里先将它转换成灰度图像再把水印嵌入到灰度图像中来进行基于DCT变换的图像水印研究。-As the two-dimensional DCT transform on the digital image matrix is concerned, therefore, for the RGB bitmap should not be DCT Transform I first convert it into gray image and then watermark is embedded into gray-scale images for image based on the DCT Transform watermarking research.
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Size: 1024 |
Author: chf068 |
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Description: 实现jpeg图像解码功能。
代码设计思路：1, Reconstruct the Huffman/RLE stream to a sequence
2, Arrange the sequence to a matrix using the zigzag scanning backwards
3, Multiply the matrix by quantization table
4, Perform inverse DCT
5, Shift the values by +128
6, Transform back to RGB color space
-Realize jpeg image decoding capabilities. Code design: 1, Reconstruct the Huffman/RLE stream to a sequence2, Arrange the sequence to a matrix using the zigzag scanning backwards3, Multiply the matrix by quantization table
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Size: 186368 |
Author: 颜新卉 |
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Description: (1)将整幅图像分成4×4块，计算每一块中所有象素RGB三个颜色通道的颜色平均值，并以此作为该块的代表颜色（主颜色）。
(2)将各块的颜色平均值进行离散余弦变换（DCT），得到DCT系数矩阵。DCT是一种分离的变换，是国际静止图像压缩标准JPEG的基础。由于大多数图像的高频分量较小，相应于图像高频分量的系数经常为零，加上人眼对高频成分的失真不太敏感，所以可用更粗的量化。因此，在一般检索中可以利用部分DCT系数作为特征向量。
(3)对DCT系数矩阵进行之字形扫描和量化，得到DCT系数。
(4)对于R、G、B三个通道，分别从DCT系数中取出4个低频分量，形成12个参数，共同构成该图像的颜色特征向量。-err
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Size: 2836480 |
Author: |
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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: This project features a complete JPEG Hardware Compressor (standard Baseline DCT, JFIF header) with 2:1:1 subsampling, able to compress at a rate of up to 24 images per second (on XC2V1000-4 @ 40 MHz with resolution 352x288).
Image resolution is not limited. It takes an RGB input (row-wise) and outputs to a memory the compressed JPEG image. Its quality is comparable to software solutions.
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Size: 3416064 |
Author: Bill Guan |
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Description: 对RGB颜色空间的彩色图像进行DCT变换，其中可保留任意的变换系数，且可根据需求改变量化步长-RGB color space for color image DCT transform, which may retain any of transform coefficients, and can be quantified in accordance with step changes in demand
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Size: 1024 |
Author: alex |
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Description: 功能十分强大的数字图像处理程序，具有基本的图像输入和变换，图形的即时绘制，彩色图像处理，图像旋转平移缩放，分离滤除RGB三原色，边缘检测与提取，频域变换（FFT，DCT），中值滤波等功能-Function is very powerful digital image processing procedures, have a basic input and transform images, graphics, real-time rendering, color image processing, image rotation scaling translation, the three primary colors RGB separation filter, edge detection and extraction, frequency domain transform (FFT, DCT ), median filtering and other functions
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Size: 4040704 |
Author: Myrrhy |
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Description: Code to show DCT on rgb image
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Size: 29696 |
Author: Shardul Oza |
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Description: 本文件包含有DCT转换（一维DCT转换，二维DCT转换），彩色图像（RGB）的segmentation。代码用visual c++编写，可以直接运行。-This file contains one dimensionaland two dimensional DCT transformation and color based image segmentation. Algorithms developed in the environment of visual c++, can be run directly in visual 2008.
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Size: 5541888 |
Author: Jason |
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Description: 基于FPGA的图像压缩算法程序，自己写的，可以参考一下-FPGA-based image compression algorithm, write your own, you can refer to
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Size: 2048 |
Author: YF |
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Description: mylsb.m是个非常完整的LSB密写源码并且密写和提取都在里面，图片我没上传，你只需要添加一个图片文件就可以了，记住图片必须是灰度图片，如果是RGB，我转换的代码也在里面很有意思哦。weipingmian.m是个提取图像位平面的程序，图片也是需要你自己加载，最后一个就是8*8块的图像DCT变换。-mylsb.m is a very complete source of LSB Steganography Steganography and extraction, and are on the inside, I did not upload pictures, you only need to add a picture file on it, remember the image must be a grayscale image, if it is RGB, I converted the code is also very interesting inside Oh. weipingmian.m is a program to extract bit-plane images, pictures, you also need to load the last one is 8* 8 DCT transformed image.
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Size: 2048 |
Author: zmb |
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Description: RGB
forward function and
inverse function
The rar contains all functions used (DCT, rle, vector to zigzag and viceversa, etc.)
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Size: 525312 |
Author: Tonychief |
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Description: 用FPGA实现的JPEG压缩器，可以直接使用，内含完整文档说明-This project features a complete JPEG Hardware Compressor (standard Baseline DCT, JFIF header) with 2:1:1 subsampling, able to compress at a rate of up to 24 images per second at the maximum resolution 352x288 (on XC2V1000-4 @ 40 MHz). IMAGE RESOLUTION IS LIMITED TO 352x288. It takes an RGB input (row-wise) and outputs to a memory the compressed JPEG image with headers. A testbench has been made that takes a bitmap image from your computer and writes a compressed JPEG file by simulating the code. In order to be able to run the project you must first generate the RAM/ROM cores and the DCT2D core with Xilinx CoreGen. The configuration values are listed at the bottom of the file compressor.vhd. If you run into any problems downloading the files from the cvs please check that you are downloading them in binary form. For any questions my email is: victor.lopez [(at)] ono [(dot)] com PLEASE NOTICE THAT THIS CORE IS LICENSED UNDER http://creativecommons.org/licenses/by-nc-sa/3.0/ (Creative Co
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Size: 868352 |
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Description: DCT Quantization on a RGB video
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Size: 54687744 |
Author: wei-chang |
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Description: 在彩色图像中嵌入二值灰度水印。有两种算法，第一种嵌入在yuv模型的y层整体系数上，第二种嵌入在rgb模型r层直流系数上。本科毕设题目，希望可以帮到你。(Two valued gray watermark is embedded in color image. There are two algorithms. The first one is embedded in the overall coefficients of the Y layer in the YUV model, and the second one is embedded in the DC coefficients of the R layer of the RGB model. Undergraduate course set up topics, I hope I can help you.)
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Size: 2911232 |
Author: 反倒是打发斯
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Description: 编程实现二维8*8图像块的DFT，DCT变换
输入一副RGB图像，将其转化为YCbCr颜色空间，然后对Y分量做分块DFT变换，保存为灰度图像，统计计算时间
编程实现8*8块DCT变换,然后分别显示，当使用64个DCT系数里面的一些系数进行重构，比较其质量；同时熟悉采用FFT来实现DCT变换的思想，并显示2维8*8DCT变换的基函数图像(Programming the DFT, DCT transform of two dimensional 8*8 image block
Input a pair of RGB images, transform it into YCbCr color space, then divide the Y component into block DFT transform, save as gray image, and calculate the calculation time
The 8*8 block DCT transform is implemented by programming, and then it is shown that when using some coefficients in 64 DCT coefficients, the quality is reconstructed. Meanwhile, the idea of DCT transformation is familiar with FFT, and the base function image of the 2 dimensional 8*8DCT transform is displayed.)
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Size: 3072 |
Author: 雪鹊
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