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[Other] tuxiang314 DL : 0: 　介绍了JPEG图像压缩算法,并在MATLAB 数学分析工具环境下从实验角度出发, 较为直观地探讨了DCT 在JPEG图像压缩中的应用。仿真实验表明,用MATLAB 来实现离散余弦变换的图像压缩,具有方法简单、速度快、误差小的优点,大大提高了图像压缩的效率和精度。李秀敏1 , 　万里青1 , 　周拥军2 (1. 河南科技大学电子信息工程学院,河南洛阳　471003 2. 中航一集团洛阳电光设备研究所,河南洛阳　471009)-introduced the JPEG image compression algorithm, MATLAB and mathematical analysis tool environment from experimental perspective, more directly on the DCT in JPEG image compression applications. Simulation results show that the use MATLAB to achieve discrete cosine transform image compression method is simple, fast, the advantages of a small error, which has greatly enhanced the efficiency of image compression and accuracy. LI Xiu-1, Green 1 Wanli, Zhou Yongjun 2 (1. Henan University of Science and Technology of Electronics and Information Engineering College, Luoyang, Henan 471003 2. A350 Luoyang Electro-Optic Equipment Institute, Luoyang, Henan 471009)
Date : 2025-12-22 Size : 106kb User : adnsid
[Other] uudfesr DL : 0: 论文包括两个方面：离散余弦变换（DCT）的快速算法及滤波器实现结构，于波变换域图像门槛降噪。离散余弦变换是广泛应用于信号处理、图像处理领域的重要工具之一，己经被多个国际标准所接受，如JPEG、MPEG、H．263等。DCT应用到实际系统中的前提是具有能够快速实现的算法，自从1977第一个真正的DCT快速算法出现以来，寻求更快、更规则、更简单的DCT快速算法一直是信号处理领域的一个研究方向。论文针对应用中对DCT长度的-papers include two aspects : discrete cosine transform (DCT) algorithm for the rapid and filter structure, in the wavelet transform domain image noise threshold. Discrete Cosine Transform is widely used in signal processing, image processing area of one of the important tools, has been a number of international standards to be accepted, such as JPEG, MPEG, H. 263, and so on. DCT applied to the actual system is the prerequisite to achieving rapid algorithm Since 1977 the first real fast DCT algorithm since its emergence, seek faster, more rules, DCT more simple fast algorithm signal processing has been an area of research. Application papers against the length of the DCT
Date : 2025-12-22 Size : 14kb User : like
[Other] w_idct DL : 0: 视频编码，DCT的纯C代码！！！可移植在特定的DSP平台上！-video coding, DCT, the pure C code! ! ! Portable specific DSP platform!
Date : 2025-12-22 Size : 127kb User : 小庄
[Other] 3FCD2807 DL : 0: 一种基于视觉模型的DCT数字水印算法提出了一种水印系统与人眼视觉模型相结合的离散余弦变换数字水印算法。该算法利用了人眼视觉模型 (Hvs)来选取水印嵌入区域，使其既能够保证水印信息的鲁棒性又能够满足其不可见性。利用基于能量关系的算法进行水印嵌入。最后进行了仿真实验，嵌入水印的图像中很难发现水印的痕迹，具有较高的清晰度。-based on the visual model DCT digital watermarking algorithm presents a watermarking system and the human visual model Guitar with the discrete cosine transform digital watermarking algorithm. The algorithm uses the human visual model (Hvs) to select embedding region, it is to ensure watermark robustness is not able to meet its visibility. Based on the energy use of the embedded watermark algorithm. Finally, the simulation experiments, the embedded watermark image watermark is difficult to find traces of high clarity.
Date : 2025-12-22 Size : 700kb User : ghostsx
[Other] A24B997C DL : 0: 一种基于感知模型的盲水印算法：根据Watson模型，结合仿射变换置乱技术和DCT量化系数奇偶特性，本文提出了一种在分块DCT中频交流系数中嵌入有含义二值水印图像，以实现盲检测的水印方案。实验结果表明，该算法对于JPEG有损压缩、图像剪切等处理有很强的鲁棒性。-a model based on the perception of the blind watermarking algorithm : According to Watson model, with affine transformation Scrambling Technology and DCT coefficient quantization Parity characteristics, This paper presents a block in exchange DCT coefficient meaning embedded in a binary image watermarking, Blind to achieve the watermark detection program. Experimental results show that the algorithm for JPEG lossy compression, image processing shear is very robust.
Date : 2025-12-22 Size : 220kb User : ghostsx
[Other] SpeakerRecogntionBasedOnVQandGMM DL : 0: 本文完成了对唇动身份识别技术几个基本问题的理论研究,并对整个系统加以实现.作为本文研究的实验基础,我们建立了唇动方式身份识别数据库(HITLUDB), 该库目前包含30个说话人每人20个汉语词的音视频语料.数据库的扩充与完善工作仍在不断的进行之中.在嘴唇检测方面, 我们对自适应色度过滤模型进行改进,提高了算法的鲁棒性,完成了对嘴唇的精确定位.结合DCT变换与K-L变换的各自特点, 我们提出了特征提取算法,使用较少维数的特征完成了对嘴唇区域主要信息的刻画.由于唇动信息同时包含了生理特征与行为特征, 我们使用静念动念混合建模的方式,完成了对说话人唇动个性特点的精确描述.在HMM训练时,我们提出了特征的归一化处理方法,提高了HMM在实际应用中的性能. 最后,我们分别对身份辨认系统与身份确认系统的基本理论进行了叙述,并完成了系统的实践工作. 关　键　词：身份识别唇动特征提取隐马尔可夫模型 K-L变换 -paper completed the lip movements identification technology several basic issues of theoretical study, system as a whole be achieved. As this paper, the experimental basis, We have established a dynamic manner lip identification database (HITLUDB) The library currently contains 30 words each of 20 Chinese words, sound and video corpus. and the expansion of the database is still perfect keep going on. Detection of the lips, we adaptive color filter model improvements, improve the robustness of the algorithm, completed a pair of lips the precise positioning. DCT combined with the K-L transform their own characteristics, We have proposed a feature extraction algorithm, use less dimension of the lips completed the main message of regional characterization. As the lip movements of information,
Date : 2025-12-22 Size : 4.98mb User : QHLee
[Other] Image_Compression_using_DCT DL : 1: Image compression using DCT
Date : 2025-12-22 Size : 47kb User : Varun
[Other] JPEGimageCompressiontechniquesimplementationandopt DL : 0: 摘　要文章以空间监控系统为背景,深入研究了JPEG图像压缩标准的实现方法,并基于FPGA对其进行了实现和优化。文中给出了详细的实现方法和优化过程,测试表明达到了很好的效果。简单介绍了有损静态图像压缩当前有两种比较流行的标准JPEG和JPEG2000。说明了用JPEG方法压缩的原因。介绍JPEG基本原理：JPEG对灰度图像的压缩处理过程主要包括:图像分割,离散余弦变换(DCT),量化(Quantization),“Z”形排序(Zigzag Scan),差分脉冲编码调制(Differential Pulse Code Modulation,DPCM)对直流系数(DC),行程长度编码(Run-Length Encoding,RLE)对交流系数(AC),霍夫曼(Huffman)编码等。 JPEG标准的特点是离散余弦变换。比较详细介绍压缩系统的构成和实现。实现提及步骤， JPEG压缩模块设计和编码模块实现细节。 -Abstract Article in the space monitoring system for the background, in-depth study of the JPEG image compression standard implementation methods and carried out based on FPGA implementation and optimization. In this paper, a detailed method of implementation and optimization of the process, testing showed that to achieve good results. Easy introduction of harmful static image compression has two kinds of comparisons that the current popular standard JPEG and JPEG2000. Illustrated by the reasons for JPEG compression method. JPEG introduce the basic principles: JPEG compression of gray-scale image processing include: image segmentation, discrete cosine transform (DCT), quantization (Quantization), "Z"-shaped sort (Zigzag Scan), differential pulse code modulation (Differential Pulse Code Modulation, DPCM) on the DC coefficient (DC), Run Length Encoding (Run-Length Encoding, RLE) of the exchange coefficient (AC), Hoffman (Huffman) coding. JPEG standard is characterized by discrete
Date : 2025-12-22 Size : 511kb User : 压子
[Other] DCT DL : 0: 在matlab的环境下基于DCT的数字水印研究-matlab
Date : 2025-12-22 Size : 3.1mb User : 宋巍
[Other] Video DL : 0: 视频压缩标准，mpeg。h.264,帧内压缩，帧间预测，DCT，反DCT，视频解码，编码流程-Video compression standards, mpeg. h.264, frame compression, inter-frame prediction, DCT, anti-DCT, video decoding, encoding process
Date : 2025-12-22 Size : 2.5mb User : 白明江
[Other] getPDF DL : 0: image compression using dct
Date : 2025-12-22 Size : 629kb User : devraj
[Other] Documents DL : 0: This a JPEG encoding & decoding program of still image. It does not use level shifting. Discrete Cosine transform (DCT) is performed both by classical & Chen s Flowgraph methods. Predefined JPEG quantization array & zigzag order are used here. RUN - LEVEL coding is used instead of Huffman coding. Compression ratio is compared for each DCT method. Effect of coarse and fine quantization is also examined. The execution time of 2 DCT methods is also checked. In addition, most energatic DCT coefficients are also applied to examine the effect in MatLab 7.4.0 R2007a. Input is 9 gray scale pictures & output is 9*9=81 pictures to compare. Blocking effect is obvious. -This is a JPEG encoding & decoding program of still image. It does not use level shifting. Discrete Cosine transform (DCT) is performed both by classical & Chen s Flowgraph methods. Predefined JPEG quantization array & zigzag order are used here. RUN - LEVEL coding is used instead of Huffman coding. Compression ratio is compared for each DCT method. Effect of coarse and fine quantization is also examined. The execution time of 2 DCT methods is also checked. In addition, most energatic DCT coefficients are also applied to examine the effect in MatLab 7.4.0 R2007a. Input is 9 gray scale pictures & output is 9*9=81 pictures to compare. Blocking effect is obvious.
Date : 2025-12-22 Size : 93kb User : Ho Joon Lee
[Other] 2 DL : 0: book that describe the DCT transform (Discret cosine transform)
Date : 2025-12-22 Size : 2.57mb User : nabila
[Other] ImageCompressionUsingDCT DL : 0: The discrete cosine transform (DCT) is a technique for converting a signal into elementary frequency components. It is widely used in image compression. Here we develop some simple functions to compute the DCT and to compress images. These functions illustrate the power of Mathematica in the prototyping of image processing algorithms. The
Date : 2025-12-22 Size : 61kb User : almolla
[Other] dct DL : 0: a very good survey on DCT compression
Date : 2025-12-22 Size : 525kb User : Zahra
[Other] DCT-QUANT DL : 0: DCt quantification veryyyyyyyy important
Date : 2025-12-22 Size : 619kb User : zinebmicro
[Other] DCT DL : 0: 在图像的dct域内嵌入数字水印，包括水印嵌入和提取程序。水印为一副图像。-In the image embedded in the DCT domain of digital watermarking, including the watermark embedding and extraction procedures. Watermark for an image.
Date : 2025-12-22 Size : 200kb User : 张习冲
[Other] dct-based-watermarking DL : 0: water marking of dct based
Date : 2025-12-22 Size : 31kb User : alpesh
[Other] MATLAB-DCT-waterprint-program DL : 0: MATLAB DCT水印源程序代码，可以实现指定的水印的嵌入特定的图片-MATLAB DCT waterprint program source
Date : 2025-12-22 Size : 44kb User : 李荣飞
[Other] DCT_The Discrete Cosine Transform DL : 0: The Discrete Cosine Transform (DCT): Theory and Application
Date : 2025-12-22 Size : 973kb User : razibaz

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