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检索条件"主题词=transform coding"

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Semi-Fragile Watermarking Based Image Authentication with Recovery Capability

Semi-Fragile Watermarking Based Image Authentication with Re...

引用

International Conference on Information Engineering and Computer Science (ICIECS)

作者： Clara Cruz Jose Antonio Mendoza Mariko Nakano Miyatake Hector Perez Meana Brian Kurkoski Research and Postgraduate Section National Polytechnic Institute ESIME Culhuacan Mexicali Mexico University of Electro-Communications Chofu Tokyo Japan

ISBN: (纸本)9781424449934

In this paper, a block wise image authentication scheme using a semi-fragile watermark is proposed. The proposed scheme determines integrity of the image, detecting regions suffered some content modifications and altered region can be recovered without the original image. In the proposed scheme, the original image is divided into two regions: Region of interest ROI, which is important region that requires protection against malicious modification and region of embedding ROE, which is the rest of the image where watermark sequence is embedded. The proposed scheme is evaluated from the several points of view: watermark imperceptibility, accuracy of tamper area detection, quality of recovered regions and robustness to nointentional manipulations, such as JPEG compression. Experimental results show excellent performance of the proposed scheme.

关键词： Watermarking Authentication Protection Image coding Data mining Digital signatures transform coding Digital images Cities and towns Robustness

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Fast partial distortion elimination based on a maximum error constraint for motion estimation

Fast partial distortion elimination based on a maximum error...

引用

IEEE International Conference on Image Processing

作者： Sangkeun Lee Jae-Young Lee Jin-Hee Lee Joon-Ki Paik Jong-Soo Choi Chung-Ang University Seoul South Korea

This paper introduces a new fast motion estimation based on a maximum matching error constraint that can eliminate an impossible candidate block much earlier than a conventional partial distortion elimination (PDE) scheme. The main contributions of the proposed scheme are that 1) it can reduce the computational cost considerably for the matching error calculation; and 2) the proposed matching ideas can be applied to the conventional PDE algorithms without significant changes. In order to evaluate the proposed scheme, we compare the results of the proposed algorithm with several baseline approaches. The experimental results show that the proposed algorithm can reduce the computations more than 62% for motion estimation at the cost of 0.005 dB quality degradation versus the general PDE algorithm.

关键词： Motion estimation Degradation Costs Computational efficiency Motion pictures Redundancy transform coding Computational complexity Testing Pattern matching

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Fast multiplierless recursive transforms using Ramanujan numbers

Fast multiplierless recursive transforms using Ramanujan num...

引用

International Multimedia, Signal Processing and Communication Technologies, IMPACT

作者： K.S. Geetha V.K. Ananthashayana Dept of E&CE R.V.College of Engineering Bangalore India Prof & Head MSRIT Bangalore India

A special class of multiplierless transforms for computing discrete cosine transform (DCT) is introduced. This algorithm is completely multiplierless to compute an N-point DCT using Ramanujan Number of order -1 and order-2. The algorithm requires evaluation of Cosine angles which are multiples of 2pi/N. If the transform size N is a Ramanujan Number and if 2pi/N cong 2 -a , then the cosine functions can be computed by shifts and adds employing Chebyshev type of recursion. In this paper, an analytical extension of the algorithm is made for 2-D Ramanujan DCT for image coding applications.

关键词： Discrete cosine transforms Chebyshev approximation Discrete transforms Image coding Matrix decomposition Head Concurrent computing Power engineering computing Parallel processing transform coding

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Parallelizing Motion JPEG 2000 with CUDA

Parallelizing Motion JPEG 2000 with CUDA

引用

International Conference on Computer and Electrical Engineering, ICCEE

作者： Sanketh Datla Naga Sathish Gidijala Department of Electronics and Computer Engineering Indian Institute of Technology Roorkee India

Due to the rapid growth of graphics processing unit (GPU) processing capability, using GPU as a coprocessor for assisting the CPU in computing massive data has become indispensable. Nvidia's CUDA general-purpose graphical processing unit (GPGPU) architecture can greatly benefit single instruction multiple thread (SIMT) styled, computationally expensive programs. Video encoding, to an extent, is an excellent example of such an application which can see impressive performance gains from CUDA optimization. This paper details the experience of porting the motion JPEG 2000 reference encoder to the CUDA architecture. Each major structural/computational unit of JPEG 2000 is discussed in the CUDA framework and the results are provided wherever required. Our experimental results demonstrate that the CUDA based implementation works 20.7 times faster than the original implementation on the CPU.

关键词： transform coding Image coding Video compression Encoding Motion pictures Central Processing Unit Computer architecture High definition video Concurrent computing Computer graphics

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Progressive compression of digital elevation data using meshes

Progressive compression of digital elevation data using mesh...

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IEEE International Symposium on Geoscience and Remote Sensing (IGARSS)

作者： Kivanc Kose Erdal Yilmaz A. Enis Cetin Bilkent University Middle East Technical University

In this paper a new Digital Elevation Map (DEM) image compression algorithm is proposed. DEM image can be threated as a grayscale image, whose pixel values are the elevation values of the map points. The grayscale DEM image is compressed using an adaptive wavelet based image compression algorithm. The method, which is an extension of the progressive mesh compression takes advantage of the multiresolution property of the wavelets while coding the map images. This makes it possible to decode different resolutions of the map from the encoded bit stream providing a multiresolution display of a given map. Experimental results are presented.

关键词： Image coding PSNR Digital elevation models transform coding TV Three dimensional displays Videoconference

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Watermarking of colour images in the DCT domain using Y channel

Watermarking of colour images in the DCT domain using Y chan...

引用

ACS/IEEE International Conference on Computer Systems and Applications

作者： A. Al-Gindy H. Al-Ahmad R. Qahwaji A. Tawfik Faculty of Engineering Ajman University of Science and Technology UAE Department of Electronic Engineering Khalifa University of Science 슠Technology and Research슠 UAE School of Informatics University of Bradford UK

In this paper an image authentication technique that embeds a binary watermark into a host color image is proposed. In this scheme the colour image is first transformed from the RGB to the YCbCr color space. The watermark is embedded into the Y channel of the host image by selectively modifying the very low frequency parts of the DCT transformation. It is shown that the proposed technique can resist classical attacks such as JPEG Compression, low pass filtering, median filtering, cropping, and geometrical scaling attack. Moreover, the recovery method is blind and doesn't need the original host image for extraction.

关键词： Watermarking Discrete cosine transforms Low pass filters Filtering Authentication Color Frequency Resists transform coding Image coding

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Hardware Design of Video Compression System in the UAV Based on the ARM Technology

Hardware Design of Video Compression System in the UAV Based...

引用

IEEE International Symposium on Computer Network and Multimedia Technology, CNMT

作者： Jian Wang Yinghui Song Institute 365 School of Electronics and Information Northwestern Polytechnical University Xi'an China Northwestern Polytechnical University Xi'an China

The video compression system is a key component of video data transfer system in the unmanned aerial vehicles (UAV). To satisfy the requirement of the wireless video transfer this paper puts forward a cost effective, power efficient and low profile video compression schemes based on the H.264 technology. The video compression system consisted of a video decoder module based on TVP5150, an H.264 CODEC based on the ***27, an video encoder module based on CH7024, memory, external control module and power supply unit. Later the video compression software was introduced also. The video compression system can not perform well in the flying experiment, and the flying experiment proved the correction and robustness of the system.

关键词： Hardware Video compression Unmanned aerial vehicles Image coding transform coding MPEG 4 Standard Image quality Real time systems Earth Observing System Bandwidth

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Dynamic and application-driven I-cache partitioning for low-power embedded multitasking

Dynamic and application-driven I-cache partitioning for low-...

引用

Symposium on Application Specific Processors, SASP

作者： Mathew Paul Peter Petrov ECE Department University of Maryland College Park USA

The abundance of wireless connectivity and the increased workload complexity have further underlined the importance of energy efficiency for modern embedded applications. The cache memory is a major contributor to the system power consumption, and as such is a primary target for energy reduction techniques. Recent advances in configurable cache architectures have enabled an entirely new set of approaches for application-driven energy- and cost-efficient cache resource utilization. We propose a run-time cross-layer specialization methodology, which leverages configurable cache architectures to achieve an energy- and performance-conscious adaptive mapping of instruction cache resources to tasks in dynamic multitasking workloads. Sizable leakage and dynamic power reductions are achieved with only a negligible and system-controlled performance impact. The methodology assumes no prior information regarding the dynamics and the structure of the workload. As the proposed dynamic cache partitioning alleviates the detrimental effects of cache interference, performance is maintained very close to the baseline case, while achieving 50%-70% reductions in dynamic and static leakage power for the on-chip instruction cache.

关键词： Multitasking Cache memory Energy consumption Runtime Embedded system transform coding Degradation Interference elimination Educational institutions Energy efficiency

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An image watermarking scheme using new wavelet filter banks

An image watermarking scheme using new wavelet filter banks

引用

IEEE International Workshop on Anti-counterfeiting, Security, Identification, ASID

作者： Liang Du Jianjun Zhang Xinge You Department of Electronics and Information Engineering Huazhong University of Science and Technology Wuhan China Engineering Research Center National Anti-counterfeit Wuhan China

The rapid growth of digital multimedia and Internet technologies have brought big challenge to copyright protection. Billions of dollars are lost every year because of illegal use of digital products. Digital watermarking is an effective method of copyright protection. Recently, watermarking in wavelet domain turns into an active research direction due to the multiresolution property of wavelet transform. Although these researches have achieved quite good results, traditional separable wavelet's inability of capturing singularities in various directions becomes an obstacle in the way of further improving watermarking capacity and robustness. To solve this problem, we use a new non-separable wavelet filter banks for watermarking. The high-frequency subimages of non-separable wavelet transform can reveal more features which are desirable in watermark embedding than that of common used separable wavelet transform. A new watermarking algorithm is proposed. Experimental results shows that our scheme is more robust against several attacks like JPEG compression, Gaussian noising and cropping ect. than the algorithms carried in the separable wavelet domain.

关键词： Watermarking Filter bank Wavelet domain Wavelet transforms Copyright protection Robustness Internet transform coding Gaussian noise Electrical capacitance tomography

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Novel Low Power, High Speed Hardware Implementation of 1D DCT/IDCT Using Xilinx FPGA

Novel Low Power, High Speed Hardware Implementation of 1D DC...

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International Conference on Computer Technology and Development (ICCTD)

作者： Rajesh Kannan Megalingam V. Vineeth Sarma B. Venkat Krishnan M. Mithun Rahul Srikumar Department of Electronics and Communication Amrita School of Engineering Kollam Kerala India Amrita Vishwa Vidyapeetham Coimbatore Tamil Nadu IN

DCT/IDCT finds potent application in the field of image and signal processing. In this paper, we concentrate on a novel five stage pipelined implementation, which consumes less power. The design uses Verilog HDL and is simulated in Modelsim 6.3b. Matlab is used to generate the data in binary format which serves as the input data and cosine values for computing 1D DCT/IDCT in HDL. There are other low power implementations as in, but in this novel implementation we prove that a lower power implementation can be done which also increases speed (of what?) by approximately five times over that of conventional implementations. The implementation of both non-pipelined (conventional) and pipelined method uses Xilinx XC3S4000 FPGA. The DCT/IDCT is found using the most common and optimum method of taking inputs as set of eight data elements. Finally, a comparison of the speeds of both implementations is made, and the speed up achieved by the low power pipelined implementation of 1D-DCT/IDCT is presented.

关键词： Discrete cosine transforms Field programmable gate arrays transform coding Hardware design languages Wavelet transforms Pipelines Equations Image processing Pixel Power engineering computing

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