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检索条件"主题词=transform coding"

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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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JPEG Steganography: A Performance Evaluation of Quantization Tables

JPEG Steganography: A Performance Evaluation of Quantization...

引用

International Conference on Advanced Information Networking and Applications (AINA)

作者： Adel Almohammad Gheorghita Ghinea Robert M. Hierons Brunei University UK

ISBN: (纸本)9781424440009

The two most important aspects of any image based steganographic system are the imperceptibility and the capacity of the stego image. This paper evaluates the performance and efficiency of using optimized quantization tables instead of default JPEG tables within JPEG steganography. We found that using optimized tables significantly improves the quality of stego-images. Moreover, we used this optimization strategy to generate a 16x16 quantization table to be used instead of that suggested. The quality of stego-images was greatly improved when these optimized tables were used. This led us to suggest a new hybrid steganographic method in order to increase the embedding capacity. This new method is based on both and Jpeg-Jsteg methods. In this method, for each 16 x 16 quantized DCT block, the least two significant bits (2-LSBs) of each middle frequency coefficient are modified to embed two secret bits. Additionally, the Jpeg-Jsteg embedding technique is used for the low frequency DCT coefficients without modifying the DC coefficient. Our experimental results show that the proposed approach can provide a higher information-hiding capacity than the other methods tested. Furthermore, the quality of the produced stego-images is better than that of other methods which use the default tables.

关键词： Steganography Quantization transform coding Discrete cosine transforms Image coding Pixel Frequency Testing Internet Image quality

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Subject Caption Detection in News Video with Complex Picture

Subject Caption Detection in News Video with Complex Picture

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Computer Science and Information Engineering, CSIE, WRI World Congress on FLAGGED

作者： Chien-Cheng Lee Yu-Chun Chiang Cheng-Yuan Shih Department of Communications Engineering Yuan-Ze University Taoyuan Taiwan Department of Mechanical Engineering Yuan-Ze University Taoyuan Taiwan

We propose a method to detect story related subject captions in news video. This paper addresses two issues of caption detection problem. One is the time consuming in the feature computation, the other is the clutter of caption detection results. We first identify the subject caption region based on the frequency of text occurrence. After that, we detect the subject caption beginning frames. In this way, the computation time can be reduced significantly. Meanwhile, the uncorrected types of text are also filtered out, and only the subject caption is detected. Experimental results show that the proposed method can fast and robustly detect subject captions from news video.

关键词： Video compression Indexing Displays Discrete cosine transforms Layout Frequency Histograms transform coding Information retrieval Speech

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A cost-error optimized architecture for 9/7 lifting based Discrete Wavelet transform with balanced pipeline stages

A cost-error optimized architecture for 9/7 lifting based Di...

引用

International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Alireza Aminlou Fatemeh Refan M.R. Hashemi Omid Fatemi Saeed Safari Multimedia Processing Laboratory School of Electrical and Computer Engineering University of Tehran Tehran Iran

ISBN: (纸本)9781424423538

Discrete wavelet transform (DWT) is increasingly recognized in image/video compression standards, as indicated by its use in JPEG2000. The lifting scheme algorithm is an alternative DWT implementation that has a lower computational complexity. In this paper, a new high performance lifting-based architecture is presented for the 9/7 DWT engine. The proposed architecture has a balanced pipeline and improves both the computational error and hardware complexity for any given working frequency. In the proposed architecture, the constant coefficients are modified by introducing new variables to the conventional lifting structure to minimize hardware cost and computational error, imposed by quantization of coefficients. Simulation results indicate a quality improvement of up to 15 dB when compared to an architecture using the standard coefficients that has the same hardware cost and working frequency. Similarly, the hardware cost is reduced by about 20% when both architectures deliver the same PSNR when operating at the same frequency.

关键词： Discrete wavelet transforms Pipelines Computer architecture Hardware Frequency Costs Image recognition Video compression transform coding Computational complexity

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Image encryption using Discrete Parametric Cosine transform

Image encryption using Discrete Parametric Cosine Transform

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Asilomar Conference on Signals, Systems & Computers

作者： Yicong Zhou Karen Panetta Sos Agaian Department of Electrical and Computer Engineering Tufts University Medford MA USA Department of Electrical and Computer Engineering University of Technology San Antonio TX USA

ISBN: (纸本)9781424458257

This paper introduces a new effective image encryption algorithm using the Discrete Parametric Cosine transform (DPCT). The new algorithm transforms images into the frequency domain using the DPCT with a set of parameters, and then converts images back into the spatial domain using the inverse DPCT with a different set of parameters to obtain the encrypted images. Its security keys are the combination of the parameters of the DPCT and inverse DPCT. The simulation results show that the algorithm can fully or partially encrypt different types of digital images with efficiency while preserving the quality of the images. The algorithm can be used to protect different types of multimedia data. It can be also used for simultaneous data encryption and compression by embedding it in a data compression process such as JPEG.

关键词： Cryptography Discrete transforms Frequency domain analysis Image converters Security Digital images Protection Image coding Data compression transform coding

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Robust Image Watermarking Scheme Based on 3D-DCT

Robust Image Watermarking Scheme Based on 3D-DCT

引用

International Conference on Fuzzy Systems and Knowledge Discovery (FSKD)

作者： Yonggang Fu College of Computer Engineering Jimei University Xiamen China

A robust image watermarking scheme based on 3-dimensional discrete cosine transform (3D DCT) is proposed for color image copyright protection. Firstly, the color image is divided into 3-D blocks, and then they are transformed into transform domain by 3D DCT transform, finally, the generated pseudo random sequence is embedded into the selected coefficients. Applying the nice correlatives among different color channels, the watermark can be embedded with good robustness. The theoretic analysis shows that the proposed method has good robustness over 2-D based method. Experimental results support the conclusion well.

关键词： Robustness Watermarking Discrete cosine transforms Discrete transforms Color transform coding Image coding Internet Protection Image processing

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Motion Vector Based Moving Object Detection and Tracking in the MPEG Compressed Domain

Motion Vector Based Moving Object Detection and Tracking in ...

引用

International Workshop on Content-Based Multimedia Indexing, CBMI

作者： Takanori Yokoyama Toshiki Iwasaki Toshinori Watanabe Graduate School of Information Systems University of Electro-Communications Chofu Tokyo Japan

ISBN: (纸本)9781424442652

As MPEG standards prevail, the opportunities to handle MPEG compressed videos increase, and the video indexing and management that can directly process the compressed videos become important. MPEG video coding standards use motion compensation to compress video data, and the motion compensation generates motion vectors that contain motion information similar to optical flows between regions in different frames. Although motion vectors are useful for video analysis, they are not always generated along moving objects, and it is difficult to analyze moving objects using only these vectors. In this paper, we propose a moving object detection and tracking method in the MPEG compressed domain for video surveillance and management. In our method, we introduce images that record moving regions and accumulate unmoving regions in which the moving objects are expected to exist after the current frame. By utilizing these images, we can detect and track moving objects using only motion vectors even if the motion vectors of moving objects become zero vectors due to their behaviors and are lost due to their picture type. We demonstrate the effectiveness of the proposed method through several experiments using actual videos acquired by an MPEG video camera.

关键词： Object detection Tracking transform coding Image motion analysis Motion compensation MPEG standards Indexing Video coding Motion analysis Image coding

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A self-embedded watermarking scheme based on relationship function of corresponding inter-blocks DCT coefficient

A self-embedded watermarking scheme based on relationship fu...

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International Conference on Computer Supported Cooperative Work in Design

作者： Guobo Li Songwen Pei Gang Chen Wenjun Cao Baifeng Wu School of Computer Science Fudan University Shanghai China

ISBN: (纸本)9781424435340

In the realm of computer supported cooperative work in design (CSCWD), how to ensure the authenticity and integrity of an image plays important roles. This paper presents a novel semi-fragile image watermarking scheme for authenticating and recovering image content. The scheme also shows strong robustness on those images' content reserved operations. It can precisely detect and locate malicious operations and tampers, and recover main content of tampered image region. Firstly, it assigns the exclusive precursor block and successor block for every block to be a block circle link, and regards the function mapping result of DCT coefficients of neighboring blocks as watermark, and embeds it into middle-frequency domain of DCT coefficients of successor block to form a watermarked image. Secondly, it verifies the blocks, which have been maliciously operated and tampered, by detecting whether the DCT coefficients of neighboring blocks satisfy the relationship function after operations. Thirdly, it uses corresponding relationship function of neighboring blocks in the link to estimate DCT direct current coefficients (DC) and low-frequency coefficients of the tampered blocks and recovers their main content. The experimental results show that the scheme is effective and feasible.

关键词： Watermarking Discrete cosine transforms Collaborative work Authentication Digital signatures Image coding transform coding Image storage Quantization Cryptography

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