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检索条件"主题词=transform coding"

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Efficient multicore scheduling of dataflow process networks

Efficient multicore scheduling of dataflow process networks

引用

IEEE Workshop on Signal Processing Systems (SIPS)

作者： Hervé Yviquel Emmanuel Casseau Matthieu Wipliez Mickaël Raulet IRISA University of Rennes 1 Lannion France IETR INSA RENNES Rennes France

Although multi-core processors are now available everywhere, few applications are able to truly exploit their multiprocessing capabilities. Dataflow programming attempts to solve this problem by expressing explicit parallelism within an application. In this paper, we describe two scheduling strategies for executing a dataflow program on a single-core processor. We also describe an extension of these strategies on multi-core architectures using distributed schedulers and lock-free communications. We show the efficiency of these scheduling strategies on MPEG-4 Simple Profile and MPEG-4 Advanced Video coding decoders.

关键词： transform coding Multicore processing Dynamic scheduling Processor scheduling Decoding Instruction sets

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SIMD implementation of integer DCT and hadamard transforms in H.264/AVC encoder

SIMD implementation of integer DCT and hadamard transforms i...

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AFRICON Conference

作者： Charles S. Lubobya Mqhele E. Dlodlo Gerhard de Jager Keith L. Ferguson Department of Electrical Engineering University of Cape Town Cape Town South Africa Meraka Institute Council for Scientific and Industrial Research (CSIR) Pretoria South Africa

This paper investigates Single Input Multiple Data (SIMD) implementations of the 4×4 integer Discrete Cosine transforms (DCT) and 4×4 Hadamard transforms in H.264/AVC video encoders. Integer DCT transforms decomposes the video signal from the spatial or image domain to the frequency domain while the Hadarmad transforms decomposes the luminance and chrominance component of the same video signal. Results show that for the same Peak Signal to Noise Ratio (PSNR) and at quality factor of eight (8), integer DCT and Hadamard transforms have a computation time gain of 14000ms and 17000ms representing a speed up of 45% and 50% compared to the matrix multiplication method respectively. At these computation time gains our implementation is suited for use in real-time video broadcasting/internet applications and in low bandwidth environments.

关键词： Discrete cosine transforms Equations Video sequences PSNR Conferences transform coding

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An effective image steganalysis method based on neighborhood information of pixels

An effective image steganalysis method based on neighborhood...

引用

IEEE International Conference on Image Processing

作者： Qingxiao Guan Jing Dong Tieniu Tan National Laboratory of Pattern Recognition CAS Institute of Automation China Department of Automation University of Science and Technology China

This paper focuses on image steganalysis. We use higher order image statistics based on neighborhood information of pixels (NIP) to detect the stego images from original ones. We use subtracting gray values of adjacent pixels to capture neighborhood information, and also make use of “rotation invariant” property to reduce the dimensionality for the whole feature sets. We tested two kinds of NIP feature, the experimental results illustrates that our proposed feature sets are with good performance and even outperform the state-of-art in certain aspect.

关键词： Feature extraction Unsolicited electronic mail Conferences Payloads Mirrors Noise transform coding

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Crowdsourcing subjective image quality evaluation

Crowdsourcing subjective image quality evaluation

引用

IEEE International Conference on Image Processing

作者： Flávio Ribeiro Dinei Florencio Vítor Nascimento Electronic Systems Engineering Department Universidade de Sáo Paulo Brazil One Microsoft Way Microsoft Research Redmond WA USA

Subjective tests are generally regarded as the most reliable and definitive methods for assessing image quality. Nevertheless, laboratory studies are time consuming and expensive. Thus, researchers often choose to run informal studies or use objective quality measures, producing results which may not correlate well with human perception. In this paper we propose a cost-effective and convenient subjective quality measure called crowdMOS, obtained by having Internet workers participate in MOS (mean opinion score) subjective quality studies. Since these workers cannot be supervised, we propose methods for detecting and discarding inaccurate or malicious scores. To facilitate this process, we offer an open source set of tools for Amazon Mechanical Turk, which is an Internet marketplace for crowdsourcing. These tools completely automate the test design, score retrieval and statistical analysis, abstracting away the technical details of Mechanical Turk and ensuring a user-friendly, affordable and consistent test methodology. We demonstrate crowdMOS using data from the LIVE subjective quality image dataset, showing that it delivers accurate and repeatable results.

关键词： Reactive power Image quality Laboratories Humans transform coding Multimedia communication Conferences

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A multichannel downstream receiver supporting channel bonding in HFC network

A multichannel downstream receiver supporting channel bondin...

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International Conference on Advanced Communication Technology (ICACT)

作者： Jae-Ho Lee Dong-Joon Choi Soo-ln Lee Whan-Woo Kim Digital Broadcasting Research Division Electronics and Telecommunications Research Institute South Korea Chungnam National University South Korea

ISBN: (数字)9788955191554

ISBN: (纸本)9781424488308

In this paper, we propose a structure of a multichannel downstream receiver supporting four downstream channel bonding in hybrid fiber coax (HFC) networks. In addition, we show the implementation and measurement results. The structure we prupose and implement consists of a radio frequency (RF) tuner and multichannel downstream receiver, which consists of a digital filter bank and four downstream demodulators. Λ downstream demodulator is comprised of a pre-forward error correction (pre-FEC) and FEC decoder. We simulate a bit error rate (BER) of the pre-FEC with a fixed precision. The simulation results show that the required E b /N 0 is 18 dB when the BER of 64QAM is 10 -5 and the required E b /N 0 is 23 dB when the BER of 256QAM is 10 -5 , The proposed multichannel downstream receiver is implemented with field programmable gate array (FPGA) and ASIC using (1.18 μm CMOS technology with a supply voltage of 1.8 V.

关键词： Bonding transform coding Bandwidth Demodulation Tuners Radio frequency CMOS integrated circuits

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Impact of inserting a stochastic noise on the visual information in a bitmap

Impact of inserting a stochastic noise on the visual informa...

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Proceedings of the International Convention MIPRO

作者： M. Köhler I. Lukić N. Slavek Faculty of Electrical Engineering Osijek Josip Juraj Strossmayer University of Osijek Osijek Croatia

This paper explains reasons for choosing a bitmap (BMP) as the basic format for inserting large amounts of additional information into the image. Structure of the BMP format is explained and shown on examples. Formula for calculating the difference of two images is proposed. Experiments were conducted on adding information to the bits of different weights in the bitmap. From the test results, conclusions were derived about the impact of adding information on the quality of original bitmap image.

关键词： Pixel Image color analysis Visualization transform coding Image coding Noise

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Control of unmanned flying vehicle based on MPEG-V international standard

Control of unmanned flying vehicle based on MPEG-V internati...

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International Conference on Ubiquitous Robots and Ambient Intelligence (URAI)

作者： Kyoungro Yoon Doohyun Kim Young-Guk Ha School of Computer Science and Engineering Konkuk University Seoul South Korea School of Internet and Media Engineering Konkuk University Seoul South Korea

ISBN: (纸本)9781457707223

MPEG has been developing MPEG-V standard to synchronize real world and virtual world. The MPEG-V Part 5, specifically, provides standardized interface to send commands to the actuators and to receive information from the sensors. This paper proposes interace for Global position command, global position sensor, and altitude sensor in XML schema to control the unmanned flying vehicles. We also implemented the land station so that the position of the flying vehicle can be displayed on the screen in real time and the user can control the flying vehicle through the user interface.

关键词： Vehicles transform coding User interfaces Synchronization Syntactics Sensor phenomena and characterization

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A DCT-based robust image watermarking using local moment

A DCT-based robust image watermarking using local moment

引用

International Conference on Data Mining and Intelligent Information Technology Applications (ICMiA)

作者： Wen-Chuan Wu Guang-Ruei Ren Department of Computer Science and Information Engineering Aletheia University Tamsui Taipei Taiwan

In order to protect the intellectual property right of an image, this paper proposes a robust digital watermarking technology based on discrete cosine transform (DCT). It mainly uses the local average moment to modify specific AC values of each DCT block so as to embed the watermark. When the content of a digital image is modified or even possessed by others through the Internet, the creator can prove the ownership of this image by the hidden watermark. Experimental results show that the proposed scheme maintains a satisfactory image quality, and the extracted watermark can also have a good accuracy after various attacks, with which the ownership of the image can be still identified.

关键词： Watermarking Discrete cosine transforms Robustness Frequency domain analysis PSNR transform coding

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Unequal error protection for robust transmission of layered video stream

Unequal error protection for robust transmission of layered ...

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International Conference on Computer Science and Service System (CSSS)

作者： Xin Xu Tongxin Xie Tong Gan College of Geography and Biological Information Nanjing University of Posts and Telecommunications Nanjing China College of Telecommunication and Information Engineering Nanjing University of Posts and Telecommunications Nanjing China Department of Video Sensing Technology East China Research Institute of Electronic Engineering Hefei China

Unequal error protection (UEP) for transmitting scalable image and video bit streams over packet erasure networks has been extensively studied. Most of the existing works consider UEP for a single source bitstream with chain-structure dependencies. However, in some state-of-the-art image and video coding techniques, such as MPEG-4 fine-grained scalable (FGS), there exist more complex tree-structure dependencies. In this paper, we propose a packetization framework for tree-structured bitstream, and present two rate allocation algorithms. Using MPEG-4 FGS as the source encoder, our experimental results show that the performance in terms of mean PSNR can be improved by adaptively allocating available bandwidth to different frames.

关键词： Forward error correction Streaming media Error correction codes Channel allocation Bandwidth Resource management transform coding

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Methodology and technique to improve throughput of FPGA-based Cal dataflow programs: Case study of the RVC MPEG-4 SP Intra decoder

Methodology and technique to improve throughput of FPGA-base...

引用

IEEE Workshop on Signal Processing Systems (SIPS)

作者： Hossam Amer Ab Al-Hadi Ab Rahman Ihab Amer Christophe Lucarz Marco Mattavelli German University in Cairo Cairo Egypt SCI-STI-MM École Polytechnique Fédérale de Lausanne Lausanne Switzerland

The specification of complex signal processing systems in hardware by means of HDL is no longer the appropriate way since they are known to be time consuming to design, and less flexible to extend features. Recently, Cal dataflow language was specified to increase productivity and scalability, with ability to synthesize to HDL for hardware implementation. In this paper, a new methodology to improve throughput of dataflow-based hardware designs is given by analyzing Cal programs using the profiling tool. As a case study, we analyzed the RVC MPEG-4 SP Intra decoder and found that the texture decoding part has the highest improvement factor. We have also introduced the luminance texture splitting technique as the improvement method by increasing the level of parallelism in the decoder. Experimental results of implementation on Virtex-5 FPGA confirmed our analysis with throughput increase of up to 50.5% with only 4.3% additional slice.

关键词： Decoding transform coding Throughput Hardware Parallel processing Space exploration Clocks

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