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检索条件"主题词=transform coding"

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Reduced reference image quality assessment for JPEG distortion

Reduced reference image quality assessment for JPEG distorti...

引用

International Symposium on Electronics in Marine (ELMAR)

作者： Salahaldeen Altous Muhammad Kashif Samee Jürgen Götze Information Processing Laboratory Dortmund University of Technology Dortmund Germany

Objective Image Quality Assessment (IQA) aims to automatically measure the quality degradation perceived by human eyes. In this paper, a new reduced-reference image quality assessment algorithm for JPEG distortion (distortion specific metric) has been proposed. This algorithm uses an 8×8 block of the original image (as a reduced-reference) and embeds this block as a watermark. To assess the quality of the image this block is extracted from the watermarked distorted image and is compared with the corresponding block from the same image. Proposed scheme results in the quality factor with which an image was originally compressed, hence gives a direct measure for quality.

关键词： Image coding transform coding Watermarking Image quality Measurement Quantization Q factor

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Performance analysis of JPEG algorithm

Performance analysis of JPEG algorithm

引用

International Conference on Signal Processing, Communication, Computing and Networking Technologies

作者： S. V. Viraktamath G. V. Attimarad S. D. M. College of Engineering and Technology Dharwad India Dayanand Sagar College of Engineering Bangalore Karnataka India

Digital images contain large amount of information that need evolving effective techniques for storing and transmitting the ever increasing volumes of data. Image compression addresses the problem by reducing the amount of data required to represent a digital image. Discrete Cosine transformation (DCT), quantization and entropy encoding are the steps in the compression of the JPEG image format. In this proposed work, the performance analysis of JPEG is carried out. Code is written for the Joint Photographic Experts Group (JPEG), the factors Compression Ratio (CR), Signal to Noise Ratio (SNR), Peak SNR (PSNR) and Mean Square Error (MSE) are studied considering different compression ratio for different images. It is found that performance will not remain same for different images even though compression factor was same.

关键词： Image coding transform coding Robustness Indexes Image storage Authentication Entropy

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Sensor network for observation of seabirds in Awashima island

Sensor network for observation of seabirds in Awashima islan...

引用

International Conference on Information Networking

作者： Shohei Uchiyama Hiroshi Yamamoto Maki Yamamoto Katsuichi Nakamura Katsuyuki Yamazaki Nagaoka University of Technology Nagaoka Niigata Japan Network Application Engineering Laboratories Limited Fukuoka Japan

It becomes so important to observe a wild life for obtaining not only knowledge of its biological behaviors but also interactions with human beings in terms of geoenvironmental investigation and assessment. A sensor network is considered to be a suitable and powerful tool to monitor and observe a wild life in fields. In order to monitor/observe seabirds, a sensor network is deployed in Awashima island, Japan. A sensor platform is useful for early and quick deployment in fields. Atlas, a server - client type sensor platform, is used with several sensors, i.e., infrared sensors, thermometers within a nest, a sound sensor and network camera. Although the project has just started, useful data such as a leaving/returning pattern of seabirds are figured out by the sensor network.

关键词： Infrared sensors Monitoring Servers Biomedical monitoring Birds transform coding

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On the Effectiveness of Retransmission in Preserving Frame Error Rate over IEEE 802.11e/a WLANs

On the Effectiveness of Retransmission in Preserving Frame E...

引用

WRI International Conference on Communications and Mobile Computing, CMC

作者： Chie Dou Chih-Wei Wu National Yunlin University of Science and Technology Yunlin Taiwan

To preserve the frame error rate (FER) of multimedia applications in the polling-based HCCA of 802.11e/a WLAN is important especially under low signal-to-noise ratio (SNR) conditions. MAC frame retransmission is an effective technique to reduce the FER, especially when there has no better modulation and coding scheme (MCS) can be selected. The Surplus Bandwidth Allowance (SBA) field in the Traffic Specification (TSPEC) element in 802.11e standard specifies the excess allocation of time over and above the stated application rates belonging to this TSPEC, by taking into account the retransmissions. This paper first identifies the relationship between the surplus bandwidth allowance and the retransmissions, which is represented as the number of frame retransmission allowance within a polled TXOP (Transmission Opportunity). Then, it investigates the effectiveness of the retransmission technique in preserving the FER of traffic streams over 802.11e/a WLAN under low SNR, ranging from 5-14 dB. Simulation results show that to preserve the FER below 3% for MPEG-2 video traffic streams, the required SNR is reduced from 14 dB to 11 dB with one retry allowance, and can be further reduced to 9 dB if two retry allowances is adopted. This paper adopts IEEE 802.11 multipath channel model in simulation.

关键词： Signal to noise ratio Quality of service transform coding IEEE 802.11e Standard Bandwidth Streaming media Simulation

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Mean Predictive Block Matching (MPBM) for fast block-matching motion estimation

Mean Predictive Block Matching (MPBM) for fast block-matchin...

引用

European Workshop on Visual Information Processing (EUVIP)

作者： Zaynab Ahmed Abir Jaafar Hussain Dhiya Al-Jumeily School of Computing and Mathematical Sciences Liverpool John Moores University Liverpool UK

In this paper, a new technique called Mean Predictive Block Matching (MPBM) is proposed. This technique is based on adaptive rood pattern search algorithm, in which the size is dynamically determined for each macroblock, based on the mean of two motion vectors of the neighboring macroblocks instead of one as is the case with adaptive rood patter search. The proposed technique attempts to decrease the computation time between the current macroblock and the macroblocks in the reference frame, by stopping the calculation of the sum absolute different between the pixels in the current and the reference frame macroblocks when the current uncompleted sum absolute value is greater than the previous calculated one. Experimental results showed that the proposed technique reduces the search time of the macroblock matching, as well as achieves better resolution for fast block motion estimation in comparison to the standard block matching algorithms.

关键词： PSNR Motion estimation Prediction algorithms Diamond-like carbon Algorithm design and analysis Simulation transform coding

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Nearly Lossless Compression of Arbitrary Images

Nearly Lossless Compression of Arbitrary Images

引用

2011 IEEE Global Telecommunications Conference - GLOBECOM 2011

作者： P. Sharma Broadata Communications Inc. Torrance CA USA

Multiple videos such as those collected using monitoring and surveillance applications generate large amounts of data. Significant reduction in data-rates are achievable if frames in these video sequences are jointly compressed. This paper describes a compression algorithm that can jointly, pair-wise compress two (or more) video frames by creating one video frame and a difference frame. The difference frame is computed by taking the difference between DCT coefficient matrix of the two frames. No similarity between frames or moving objects is assumed. Instead, we rely upon the inter-frame and intra-frame correlation characteristics at the macro-block level. The technique is applied for frames exhibiting inter-frame correlation coefficient as low as 0.1. A compression-ratio of close to 30% is obtained.

关键词： Correlation Discrete cosine transforms Image coding Videos Encoding transform coding Analytical models

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Data hiding for quality access control and error concealment in digital images

Data hiding for quality access control and error concealment...

引用

IEEE International Conference on Multimedia and Expo (ICME)

作者： Amit Phadikar Santi P. Maity Claude Delpha Department of Information Technology MCKV Institute of Engineering Howrah India Laboratoire des Signaux et Systemes CNRS Supelec Universite Paris-Sud XI (UPS) France

This paper proposes a data hiding scheme to serve dual purpose of quality access control and error concealment of digital images. This is accomplished by projecting host image first on N-mutually orthogonal sample sets followed by embedding of an encoded binary watermark (host digest) using quantization index modulation (QIM) but without complete self-noise suppression. It is well known that due to insertion of external information, there would be degradation in visual quality of the host image. This has been used here to play the key role in access control through reversible process and error concealment using the extracted image digest. Decision variable for each bit of watermark decoding is formed from the weighted average of N-decision statistics that increases the correctness of extracted watermark bits. This improved detection enables self-noise suppression by authorized user, error concealment in fading radio mobile channel and thus leads to avail better quality image. Simulation results have shown the validity of our claims along with relative comparative results for other existing works.

关键词： Watermarking Discrete cosine transforms Access control PSNR Decoding transform coding Mobile communication

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Customized MPSoC synthesis for task sequence

Customized MPSoC synthesis for task sequence

引用

Symposium on Application Specific Processors, SASP

作者： Liang Chen Nicolas Boichat Tulika Mitra Department of Computer Science National University of Singapore Singapore

Multiprocessor System-on-Chip (MPSoC) platforms have become increasingly popular for high-performance embedded applications. Each processing element (PE) on such platforms can be tuned to match the computational demands of the tasks executing on it, creating a heterogeneous multiprocessor system. Extensible processor cores, where the base instruction-set architecture can be augmented with application-specific custom instructions, have recently emerged as flexible building blocks for heterogeneous MPSoC platforms. However, the customization of the different PEs has to be carried out in a synergistic manner so as to create an optimal system. In this work, we propose a pseudo-polynomial time algorithm to design the most resource-efficient customized MPSoC platform for mapping linear task graphs representing streaming applications, under deadline constraints. Experimental validation with MP3 encoder and MPEG-2 encoder applications confirms the efficiency of our approach.

关键词： Algorithm design and analysis transform coding Digital audio players Heuristic algorithms Throughput Computer architecture Software

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Prediction of video perceptual quality in the presence of packet loss

Prediction of video perceptual quality in the presence of pa...

引用

International Conference on Telecommunications (ConTEL)

作者： Qin Dai Ralf Lehnert Chair for Telecommunications Technische Universität Dresden Dresden Germany

There is an increasing interest in transmitting video services over IP network. As a result, packet loss becomes one important parameter in determining the service quality. In this paper, we focus on the packet loss problem of MPEG video streaming service and its influence on the observed quality (Quality of Experience). We introduce a novel NR (No Reference) objective method, which is impairment event based, to estimate the short-term perceptual video quality in the presence of packet loss. By this method, the packet losses measured in a network will be classified into GOPs (Group Of Pictures) to evaluate the impact of the deduced video impairment. The second step of this proposal estimates the overall video quality by taking the impairment pattern within the entire measurement period under consideration. We conducted a series of subjective experiments covering various factors of packet loss, e.g., loss quantity, loss type, loss distribution, and investigated their perceptual impacts on H.264/AVC videos. We explored the relation between the packet losses of a GOP and their deduced single impairment event. We found that the behaviour of video degradation according to different packet loss ratio can be described by a logistic function. We also examined the video quality with different times of impairment events occurring within a short period. We found that more than two times impairment events can lead the video quality to be unacceptable (MOS value below 2.5). Furthermore, a GLM (Generalized Linear Model) model has been proposed to estimate the video quality in the case of dual impairments.

关键词： Streaming media Loss measurement Degradation Observers Visualization transform coding

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MPEG-7 compliant generalized structure descriptor for still image indexing

MPEG-7 compliant generalized structure descriptor for still ...

引用

IEEE International Conference on Image Processing

作者： Constantin Vertan Marta Zamfir Alexandru Drîmbărean Adrian Zamfir Tessera Technologies Inc. Bucharest Romania

This paper proposes a generalized structure descriptor (GSD), that offers an MPEG-7 compliant template for the introduction of a large class of local image content descriptors. The standard MPEG-7 color structure descriptor (CSD) is a particular case of the proposed GSD. The GSD descriptor embed color and spatial distribution information, allowing a compact description of color and texture to be used in content-based image retrieval. We will present several particular cases of spatial image structure description. Experiments show that the proposed descriptors can be successfully used for color texture and general image recognition and retrieval.

关键词： Image color analysis transform coding Histograms Image retrieval Image recognition

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