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Description: 普通DCT，快速DCT,快速IDCT算法的实现 vc程序 希望你喜欢！-ordinary DCT, fast DCT and IDCT algorithm for the rapid realization vc procedures hope you like!
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Author: ddda |
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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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Author: 朱晓路 |
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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:
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Size: 91136 |
Author: 严刚 |
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Description: dct and idct for image.matlab实现信息序列的嵌入和提取-dct and idct for image.matlab realize embedded information and extract sequence
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Size: 2048 |
Author: wubaishan |
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Description: 加深对图像变换的理解。计算图像的离散余弦变换J；设置不同的量化门限，计算其逆变换IDCT，并显示。-Deepen the understanding of the image transform. Calculating the discrete cosine transform image J setting different quantization threshold to calculate the inverse transform IDCT, and displayed.
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Size: 28672 |
Author: Ashtray |
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Description: the attached utility is a work I ve submitted to the university
It shows what a jpeg compression is all about.
the function implements the DCT transform, using a matrix operator.
note that matlab has a function for the DCT and iDCT transforms
that might be more efficient.-the attached utility is a work I ve submitted to the universityIt shows what a jpeg compression is all about.the function implements the DCT transform, using a matrix operator.note that matlab has a function for the DCT and iDCT transforms that might be more efficient .
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Size: 114688 |
Author: 风帆 |
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Description: 两个对已知图像库的图像，实现有效的反余弦变换，实现图像的压缩编码-2 pairs of image database of known images, to achieve effective anti-cosine transform, image compression coding
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Author: 陆波 |
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Description: 论文设计了基于高性能通用DSP TMS320C64x的HDTV视频解码程序。该解码
程序针对C64的特殊架构做了多方面的优化。特别是对变长解码、IDCT和运动
补偿三个关键模块人工编写了汇编语言程序、调整了流水线操作。经过优化，显
著提高了解码效率。通过软件仿真可以得出如下重要结论：1）进行人工汇编优
化之后的程序效率相比于仅仅采用C语言优化之后的程序效率提高了将近七倍；
2）人工汇编优化之后，对标准清晰度视频进行实时解码时要求的时钟频率仅为
228.8MHz；3）对高清晰度视频进行实时解码时要求的时钟频率在1GHz左右。这
项研究对使用通用DSP实现高清晰度电视视频解码乃至实现整个信源解码器有
重要的价值，推动了通用DSP在消费电子领域多媒体技术方面的应用。
该文讨论了如何使用Matlab 的Complier 将*.m函数编译为动态链接库DLL， 提供给VC++
调用的方法， 提供了一种VC++与Matlab 混合编程的快速实现。
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Author: 王萍 |
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Description: 图像变换 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-Image transform to image sub-block (8* 8), for the DCT transform, and IDCT: DCT is a separable transform image to image compression coding, IDCT used to extract
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Size: 17408 |
Author: 陈杰 |
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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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Author: 张元 |
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Description: DCT变换的实现，快速变换IDCT实现，VC工程-The realization of DCT transform, fast transform IDCT realization, VC works
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Author: 流星 |
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Description: 频域法加入数字水印的原理是首先将原始信号（语音一维信号、图像二维信号）变换到频域，常用的变换一般有DWT、DCT、DFT、WP和分形。然后，对加入了水印信息的信号进行频域反变换（IDWT、IDCT、DFT、WP），得到含有水印信息的信号。-Frequency-domain digital watermarking method by adding the principle is that first of all, the original signal (voice signal of one-dimensional, two-dimensional image signal) to frequency domain transformation, commonly used in general transform DWT, DCT, DFT, WP and fractal. Then, adding the watermark information signal to the frequency domain inverse transform (IDWT, IDCT, DFT, WP), received signal containing the watermark information.
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Author: laura |
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Description: compression with dct&idct
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Size: 88064 |
Author: saeed |
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Description: 这段程序是前面dct程序嵌入的逆过程，即进行信息的提取，从而获得置乱原始信息-Dct in front of this program is the reverse process of embedding process, namely, the extraction of information, thereby scrambling the original information obtained
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Author: blazer |
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Description: 2D-DCT 压缩图像后，通过QPSK,AWGN信道编码传输后，IDCT解压缩回原始图像，适用于任何图像-Using DCT to compress the orginal image, I use zigzag program, quantization, dct compression, then change the vector to bineary bit to pass through the QPSK channel. And from the binary array, I use IDCT to reconstructe the orignial image. working perfectly.
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Size: 4036608 |
Author: Jackie |
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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: 对原始灰度图像进行图像压缩，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
-The original gray image compression, this map for 8 × 8 DCT transform, respectively, to retain only the DC coefficient, and to retain the former 4,8,16 months transform coefficients (DC+ AC), and then separately IDCT transform
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Size: 1024 |
Author: potato |
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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: 3072 |
Author: 嘟嘟 |
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Description: 将图片进行8*8块的dct变换，以及8*8块的反变化恢复原图像-use 8*8 block dct to chang image, and use 8*8 block idct to renew image.
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Size: 216064 |
Author: jiang jianxing |
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