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Description: 这是一个集4位8位16位32位得快速DCT算法。-Set 4 8 16 32 sightings of fast DCT algorithm.
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Size: 8201216 |
Author: 安风铃 |
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Description: 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，尽量避免有损压缩对水印信息可能带来的损失。还有一种DCT方法就是把水印信息嵌入到高频系数上，但是采用这种方法，抗压缩性非常差。-done to the original signal DCT algorithm : Cox Piva and others made the DCT technology classic. Cox using random number generator producing standard normal sequence information as a watermark image of the overall DCT, DC coefficient selection removed outside some lower frequency coefficient superposition watermark information Piva will be replaced by images of the entire IF part. The original signal block, before making the DCT algorithm : Wu Hsu and put images 8* 8 block, a binary sequence as watermarks Add DCT IF; Some scholars calculated whole image of DCT, a real sequence embedded IF DCT coefficients. IF the choice is a good one to minimize the embedded information to the subjective visual images; Meanwhile, try to avoid Compression right watermark information possible losses. There
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Size: 33792 |
Author: 圣子到 |
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Description: 我自己写的DCT变换，8*8点的，采用FFT算法完成快速的DCT-I wrote it myself DCT, 8* 8 o'clock, FFT algorithm rapid completion of the DCT
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Size: 51200 |
Author: 邓云 |
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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: 本源码是用VC++6.0实现的，显示了BMP位图，并实现了快速的8*8的块的DCT和IDCT变换-the source of VC 6.0, showing a bitmap BMP, and achieve a rapid 8* 8 block of DCT and IDCT transform
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Size: 4562944 |
Author: 颜色 |
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Description: Sobel算子：是一种空域微分算子，可以通过它锐化图象。
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。-Sobel Operator : airspace is a differential operator, through its image sharpening. Image will block (8* 8), for the DCT and IDCT for : DCT is a separable Image Transform, used to image compression coding.
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Size: 2048 |
Author: xuhua |
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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: 几种常用的压缩算法
本程序包含以下功能：
1、 Arithmetic coding
2、 Huffman coding
3、 LZ77 coding
4、 LZ78 coding
5、 LZW
6、 RLE
7、 DCT
8、 Furie transform
-Several commonly used compression algorithm This procedure includes the following features: 1, Arithmetic coding2, Huffman coding3, LZ77 coding4, LZ78 coding5, LZW6, RLE7, DCT8, Furie transform
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Size: 19494912 |
Author: 王若 |
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Description: this si Arithmetic core,it contains FreeDCT-L and FreeDCT-M.FreeDCT-L is a low power architecture 1-Dimensional 8-point DCT/IDCT core.FreeDCT-M is a moderate speed 1-Dimensional IDCT core
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Size: 866304 |
Author: lilei |
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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: 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: DCT算法，已通过实验证明，效果很好，欢迎下载使用-DCT algorithm has been proved through experiments, the effect well, welcome to download
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Size: 3926016 |
Author: 钱靖 |
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Description: 用于视频图像编码的8×8DCT变换，可用于MPEG4.H263等VHDL编程-For video images encoded 8 × 8DCT transform, can be used to MPEG4.H263 such as VHDL Programming
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Size: 108544 |
Author: zs |
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Description: 8*8DCT,基于流水线设计，比较经典，可以用于JPEG，也可以用于H.264（需改为4*4）-8* 8DCT, based on the pipeline design, compare a classic, can be used in JPEG, can also be used for H.264 (to be replaced 4* 4)
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Size: 6144 |
Author: 周辉 |
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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: 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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