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Description: 用SIMULINK编写的二自由度车建模，一为数据文件，一为建模文件-SIMULINK prepared with the two degree of freedom model cars, as a data file, a document for Modeling
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Size: 4096 |
Author: 猫猫 |
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Description: 数字图像处理实验
根据原图像的直方图，发现背景和目标的分割值大约在130左右，并将灰度图像转为二值图像，分割效果比较理想。
图像处理实验（六）图像压缩与编码
实验目的： 学习JPEG压缩编码
实验内容：
一．实现基本JPEG的压缩和编码分三个步骤：
1． 首先通过DCT变换去除数据冗余；
2． 使用量化表对DCT系数进行量化；
3． 对量化后的系数进行Huffman编码。-digital image processing experiments based on the original image histogram, found background and objectives of the divided about the value of around 130 and two gray-scale image to image, Segmentation more satisfactory results. Image processing experiments (6) Image Compression and Coding of the experiment : Learning JPEG compression coding experiment : one. Basically JPEG compression and coding in three steps : 1. First through DCT remove data redundancy; 2. Using quantitative table right DCT coefficient quantization; 3. Right quantized coefficients of Huffman coding.
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Size: 4096 |
Author: qq |
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Description: 实现基本JPEG的压缩和编码
％ 1． 首先通过DCT变换去除数据冗余；
％ 2． 使用量化表对DCT系数进行量化；
％ 3． 对量化后的系数进行Huffman编码。
-achieve basic JPEG compression and coding% 1. First through DCT remove data redundancy; % 2. Using quantitative table right DCT coefficient quantization; 3. Right quantized coefficients of Huffman coding.
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Size: 1024 |
Author: 孙雨萌 |
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Description: DCT水印设I 为载体数据,W 为水印信号, K 为密钥,那
么嵌入水印后的载体Iw 可描述为[124 ] :
Iw = F( I ,W , K) . (1)
式中, F 表示水印的嵌入策略。-I as a carrier of data, W for the watermark signal, K key, Then the watermark embedded vector can be described as Iw [124] : F = Iw (I, W, K). (1)-, F said watermark embedding strategy.
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Size: 1024 |
Author: 江力 |
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Description: 实现基本JPEG的压缩和编码分三个步骤:
1. 首先通过DCT变换去除数据冗余；
2. 使用量化表对DCT系数进行量化；
3. 对量化后的系数进行Huffman编码。-Realize the basic JPEG compression and encoding is divided into three steps: 1. First of all, through the DCT transform to remove data redundancy 2. The use of quantization table of quantization DCT coefficients 3. Quantization coefficients after Huffman coding.
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Size: 2048 |
Author: 后果 |
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Description: This file include the DCT and IDCT transform of an image.
void show_DCT( void )
void DCT_8x8( float* data )
void IDCT_8x8( float* data )
void BDCT( float* input,int rows,int cols )
void BIDCT( float* input,int rows,int cols )
void get_8x8DCT( float* output, int pos_y, int pos_x, float* image, int rows, int cols )
void set_identity( float* data, int size, bool flag )
float* mult_8x8( float*data1,float*data2 )
float* sm_mult_8x8( float *C1, float *A, float *C2 )
float* add_8x8( float*data1,float*data2 )
void initial_fast()
void close_fast()
void get_fast_8x8DCT_sparse( float* output, int pos_y, int pos_x, float* input, int rows, int cols )
void get_fast_8x8DCT( float* output, int pos_y, int pos_x, float* input, int rows, int cols, bool sparse )
-This file include the DCT and IDCT transform of an image.
void show_DCT( void )
void DCT_8x8( float* data )
void IDCT_8x8( float* data )
void BDCT( float* input,int rows,int cols )
void BIDCT( float* input,int rows,int cols )
void get_8x8DCT( float* output, int pos_y, int pos_x, float* image, int rows, int cols )
void set_identity( float* data, int size, bool flag )
float* mult_8x8( float*data1,float*data2 )
float* sm_mult_8x8( float*C1, float*A, float*C2 )
float* add_8x8( float*data1,float*data2 )
void initial_fast()
void close_fast()
void get_fast_8x8DCT_sparse( float* output, int pos_y, int pos_x, float* input, int rows, int cols )
void get_fast_8x8DCT( float* output, int pos_y, int pos_x, float* input, int rows, int cols, bool sparse )
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Size: 5120 |
Author: wan_xianglin |
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Description: 根据W. Bender的《Techniques for data hiding》编写
％用补丁方法对图象做DCT域的水印嵌入和提取，
％效率极高，程序简洁，属信息隐藏中常用的方法之一。
％作者：辽宁大学 信息学院 范铁生
％email:fts0@163.com-W. Bender in accordance with the
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Size: 1024 |
Author: gao |
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Description: 由上述实验过程的图像变化可知，经过傅立叶变换和反变换及DCT离散余弦变换和反变换后，图像都发生了很大的变化，首先是经过2-D傅立叶变换后，图像数据频域出现高频数据集中，低频数据在四周的现象，然后再经过2-D傅立叶变换反变换后，图像再次恢复原始图。而2-D离散余弦变换对图像的影响也是如此。-From the above experiment, we can see the image change, after Fourier transform and inverse transform and DCT discrete cosine transform and inverse transform, the images have changed a lot, first of all, is a 2-D Fourier transform, the image data emergence of high-frequency frequency-domain data, low-frequency data in the four weeks of the phenomenon, and then after a 2-D Fourier transform inverse transform, the image again to restore the original map. And 2-D discrete cosine transform on the impact of images is also true.
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Size: 475136 |
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Description: 探讨了基于zigzag置乱的MPEG4视频数据加密技术，指出了这种方案在安全性方面的不足，提出了改进方
案。改进的方案中AC系数用不同的置乱表置乱，DC系数用高强度的加密算法AES加密。最后给出了改进后的加密效
果，并且从加密速度，安全性和码流变化三个指标衡量了该方案的应用价值。 -Discussion based on the zigzag Scrambling MPEG4 video data encryption technology, pointing out that such a program in the security deficiencies, suggestions to improve the program. Improvement program with a different AC coefficient table Scrambling Scrambling, DC coefficient of high-strength encryption algorithm AES encryption. Finally, the effect of the improved encryption, and from the encryption speed, safety and code changes in the three indicators to measure the flow of the program application value.
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Size: 165888 |
Author: 吴笛 |
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Description: 2维DCt源码，可以实现8乘8点数据的2维DCT变换
-2-D DCT-source, you can realize 8 x 8 data 2-D DCT transform
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Size: 5120 |
Author: jz |
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Description: 实现JPEG的压缩和编码
（1）首先通过DCT变换去除数据冗余；
（2）使用量化表对DCT系数进行量化；
（3）对量化后的系数进行Huffman编码。
-The realization of JPEG compression and coding (1) First of all, through the DCT transform to remove data redundancy (2) the use of quantization table of quantization DCT coefficients (3) of the coefficients after quantization Huffman coding.
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Size: 2048 |
Author: 李雅 |
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Description: Discrete cosine transform to compress data.
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Size: 217088 |
Author: Tung |
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Description: 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，并由此分析直流和低频系数的重要性。
-Known brightness of two different image data block is as follows: (1) Principles of analysis of DCT, the DCT method, program and calculate the corresponding DCT coefficient, analysis of distribution coefficients. (2) quantitative analysis based on visual characteristics of the distribution of long-form features step-by-step to complete the DCT coefficient quantization. (3) the use of Z-scan output data to achieve statistical encoding, the formation of Video stream. (4) the use of the reconstructed image brightness IDCT data to calculate the SAD size, analysis of the causes of errors and the use of DCT for the principle of data compression. () (5), respectively, a factor of 1,3,6 using the upper left corner of the reconstruction of images, calculating the corresponding SAD, and the resulting analysis of DC and the importance of low-frequency coefficients.
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Size: 1024 |
Author: 张元 |
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Description: 针对给定的静止图像进行DCT 变换
给定不同的阈值及将数据块中不同位置的值置为0所得到的不同情况下压缩-For a given static image DCT transform a given threshold and a different data block at different positions of a value of 0 has been compressed under different circumstances
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Size: 62464 |
Author: 孟斌 |
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Description: JPEG压缩算法的核心是“视觉保真”原理，利用人类视觉系统特征进行处理，以达到最大图像数据压缩效果，实际上就是去除那些人眼不易觉察的信息。图像的空间频率对人的视觉至关重要，采用离散余弦变换可将图像分解成一组波，每个波有一个不同的空间频率，这样可以去除人类眼睛觉察不到的信息，而且还可使系统只保留重要的信息。-JPEG compression algorithm is the core of " visual fidelity" principle, the use of the characteristics of human visual system to deal with in order to achieve the greatest effect of the image data compression is actually not easy to remove the eyes of those who perceived the information. Image spatial frequency is essential to human vision, the use of discrete cosine transform image can be broken down into a set of waves, each wave has a different spatial frequency, so aware of the human eye can not see the removal of information, but also to make system, only the important information.
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Size: 1024 |
Author: huoxinglin |
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Description: Matlab source code for DCT-based watermarking for grayscale images. DCT-based watermark recovering without resorting to the uncorrupted original image. Digital watermarking has been proposed as a viable solution to the need of copyright protection and authentication of multimedia data in a networked environment, since it makes possible to identify the author, owner, distributor or authorized consumer of a document.
A new watermarking technique to add a code to digital images is presented: the method operates in the frequency domain embedding a pseudo-random sequence of real numbers in a selected set of DCT coefficients. Watermark casting is performed by exploiting the masking characteristics of the Human Visual System, to ensure watermark invisibility. The embedded sequence is extracted without resorting to the original image, so that the proposed technique represents a major improvement to methods relying on the comparison between the watermarked and original images.
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Size: 98304 |
Author: omar |
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Description: H264中的整数DCT变换编码及量化代码,并附有原文的DCT编码、量化的说明文档。本源码从X264及JM中抽取后整理得来，并用原文档中的示例数据进行了测试，与原文档结果完全一样，是学习H.264不可多得的参考资源.
-H264 in the integer DCT transform coding and quantization code, together with the original DCT coding, quantitative description of the document. The source from the X264 and JM Finishing extract obtained and used the original document in the test sample data with the results of exactly the same as the original document, is to study rare H.264 reference resources.
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Size: 64512 |
Author: ren |
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Description: bmp DCT 压缩
对原图像进行DCT变换，数据压缩，丢弃右下角高频数据，进行DCT反变换，得到压缩后的图像-bmp DCT compression of the original image DCT transform, data compression, discarding the lower right corner frequency data, DCT inverse transform, the images are compressed
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Size: 156672 |
Author: zjj |
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Description: all ok...4 Dec 2009 ... In this method the 2-Dimensional DCT is obtained by taking two ... column-wise 1D DCT is ascertained which gives the 2D DCT of the data. ... The design is done in Verilog HDL and the simulation is done in Modelsim 6.3b.
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Size: 1024 |
Author: haziq36 |
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Description: 通用数据库格式转换工具dct
支持Oracle,SQL Sever,Access,Excel等数据库之间数据格式批量转换:即Oracle转SQL Server；SQL Server转Oracle；Oracle转Access；Access转Oracle；SQL Server转Access, Access转SQL Server等,支持Oracle,SQL Sever,Access导出Excel。-Dct common database format conversion tool supports Oracle, SQL Sever, Access, Excel and other database batch conversion between data formats: the Oracle switch to SQL Server SQL Server switch to Oracle Oracle switch to Access Access switch to Oracle SQL Server switch to Access, Access switch SQL Server, and support for Oracle, SQL Sever, Access to export Excel.
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Size: 1092608 |
Author: lei |
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