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检索条件"主题词=transform coding"

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Fusing digital audio watermarking and authentication in diverse signal domains

Fusing digital audio watermarking and authentication in dive...

引用

European Signal Processing Conference (EUSIPCO)

作者： Nedeljko Cvejic Tapio Seppänen MediaTeam Oulu University of Oulu Finland

A novel scheme that is able to merge digital watermarking and content authentication of digital audio is presented in this paper. The embedding of additional data is performed in different signal domains. Watermark embedding is made by frequency hopping method in the Fourier domain, while the additional authentication data is hidden using the LSB modulation in the wavelet domain. The perceptual transparency is achieved using the frequency masking property of the HAS. The scheme obtains high robustness against standard watermark attacks and localizes accurately tampered parts of the audio clip.

关键词： Watermarking Authentication Robustness Synchronization Signal processing algorithms transform coding Filtering

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Hybrid-1D macroblock prediction for video compression

Hybrid-1D macroblock prediction for video compression

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European Signal Processing Conference (EUSIPCO)

作者： J-M. Thiesse J. Jung M. Antonini Orange Labs Issy Les Moulineaux France Laboratoire I3S UNSA/CNRS Antipolis France

2009 appears to be the launching date for several activities intented to challenge the video compression standard H.264/AVC. Improvements upon H.264/AVC can be achieved either by breakthrough or incremental approaches. Due to the extreme fine tuning of H.264/AVC, the former seems tough. The latter however seems more achievable, even with the announced 50% coding efficiency improvement objective. In this highly challenging context, we propose a new scheme for macroblock partitioning and prediction. We extend the previously proposed Intra 1D scheme with a Skip 1D mode. Therefore, a macroblock is split in 1D partitions which can be predicted through two submodes in competition: Intra 1D or Skip 1D. As a second step, we further extend this scheme with an Inter 1D submode and provide the first keys to make this mode efficient. With the Intra 1D+Skip 1D scheme, an average 5.7% gain is reported compared to H.264/AVC, up to 10.1% for a given sequence. Preliminary results are also reported when the Inter 1D mode is added.

关键词： Encoding Video coding Vectors Bit rate Discrete cosine transforms Standards transform coding

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On the refinement of the DCT/IDCT scaling factor sensitivity

On the refinement of the DCT/IDCT scaling factor sensitivity

引用

IEEE International Conference on Multimedia and Expo (ICME)

作者： Ihab Amer Wael Badawy Vassil Dimitrov Graham Jullien German University in Cairo New Cairo Egypt Advanced Technology Information Processing Systems University of Calgary Calgary AB Canada

This paper proposes to represent the floating-point multipliers required to perform IDCT implementations using a rational Diophantine (i.e. ratio of integers) approximation with a common denominator, which is not necessarily a power of two. A case study to support this proposal is presented by applying the proposed scheme to Chenpsilas IDCT algorithm. Results show better performance when applying the proposed scheme compared to the traditional shift process. Similar studies can be obtained for any other potential up-scaling factor, and by modifying any other potential IDCT fast algorithm.

关键词： Discrete cosine transforms transform coding Approximation algorithms Approximation methods transforms Heuristic algorithms Software

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Modified pre and post processing methods for optimizing and improving the quality of VP8 video codec

Modified pre and post processing methods for optimizing and ...

引用

International Conference on Electronics and Communication Systems (ICECS)

作者： S Basavaraju B. Sivakumar ECE Dept SCE Bengaluru TCE Dept Dr AIT

Pre-processing and post-processing algorithms improve on the performance of a video compression system especially by removing spurious noise and insignificant features from the original video data. So that this will increases compression efficiency, attenuates coding artifacts and mainly improving the quality of Video data. And more over existing video compression standards like MPEG, H.26x series are highly computationally expensive and hence they are not suitable for real time applications. Unlike video compression/decompression codec's, video pre- and post-processing algorithms are not much standardized as of now. They might be different by end product. In addition, these algorithms are constantly being updated and new ones regularly appear. One more importance of these techniques are achieving low bit rate, high bit rate reduction while maintaining the best possible perceptual quality, post processing techniques provide one attractive solution. In result, the quality of the images is significantly improved.

关键词： Streaming media transform coding Encoding Noise Decoding Video compression Image coding

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Quality assessment for stereoscopic images with JPEG compression errors

Quality assessment for stereoscopic images with JPEG compres...

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IEEE International Conference on Consumer Electronics-Taiwan (ICCE-TW)

作者： Kenny H. B. Voo David B. L. Bong Faculty of Engineering Universiti Malaysia Sarawak Malaysia

In this paper a new quality assessment method for stereoscopic image with compression distortion is proposed. This method is designed based on hybrid of 2D image quality metrics and stereoscopic depth map information. The proposed metric is tested on LIVE 3D image database with JPEG and JPEG2000 (JP2K) errors. As a result, this metric has shown an improved performance in assessing perceived quality for stereoscopic images.

关键词： Measurement Stereo image processing Distortion transform coding Quality assessment Image quality Image coding

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A low-cost video frame-rate up conversion using compressed-domain information

A low-cost video frame-rate up conversion using compressed-d...

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IEEE International Conference on Image Processing

作者： S. Sekiguchi Y. Idehara K. Sugimoto K. Asai Information Technology R&D Center Mitsubishi Electric Corporation Limited Kamakura Japan

A new low-cost video frame-rate up conversion (FRC) technique that exploits compressed-domain information is proposed in this paper. Recent worldwide growth of digital video applications such as home AV network or mobile multimedia have been demanding higher video compression ratio in order to meet system requirements due to limited bandwidth or storage capacity. Enhancement of temporal resolution using FRC at decoder side is attractive in a sense that the R-D performance can be maintained even at low bitrates by dropping frames during encoding process and recovering them at the decoder. The proposed FRC aims to provide accurate estimates of motion vectors for recovered frames based on compressed-domain information. The goal of our study is to realize a decoder design with robust FRC over a variety of implementation platforms from mobile to consumer set-top.

关键词： Video compression Decoding Motion estimation Bit rate Robustness Codecs Multimedia systems Bandwidth Encoding transform coding

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A method for carving fragmented document and image files

A method for carving fragmented document and image files

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International Conference on Advances in Human Machine Interaction (HMI)

作者： Akshara Ravi T Raj Kumar Angelo Renju Mathew Dept. of CSE Dept of CSE College of Engineering Pathanamthitta Kerala India Terna Public Charitable Trust's College of Engineering Osmanabad Maharashtra IN Dept of CSE College of Engineering Kallooppara Pathanamthitta Kerala India

Recovering deleted files play an important role in a digital forensic investigation. When a file is deleted, only pointers that link file's metadata to its content are deleted and metadata entry is marked as deleted. As long as data is not overwritten or wiped, deleted data will remain in unallocated space. One of the methods that can be used to recover these deleted files is file carving. File carving reconstructs files only based on their content unlike traditional data recovery methods that use metadata that points to the content. It is mainly done using headers and footers of file types. One of the primary challenges in file carving is to recover deleted files that were fragmented. When a file is fragmented, carving only based on header and footer will produce corrupted file. So this paper discusses a method for carving fragmented document and image files from a FAT32 formatted USB drive.

关键词： Image reconstruction Dictionaries Metadata Force transform coding File systems Data mining

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A novel technique to acquire perceived utility scores from textual descriptions of distorted natural images

A novel technique to acquire perceived utility scores from t...

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IEEE International Conference on Image Processing

作者： David M. Rouse Yiran Wang Fan Zhang Sheila S. Hemami Visual Communications Laboratory School of Electrical and Computer Engineering Cornell University Ithaca NY USA

Many applications value an assessment of distorted natural images according to their usefulness, or utility, rather than their perceptual quality. For the quality task, human observers evaluate an image based on its perceptual resemblance to a reference, whereas for the utility task, the usefulness of an image as a surrogate for a reference is under evaluation. This paper presents a novel technique for acquiring perceived utility scores derived from textual descriptions produced by observers viewing images. The technique uses an observer-centric approach, so observers dictate the relevant concepts that characterize image usefulness. This technique is used to collect perceived utility (PU) scores for 150 distorted images that simulate scenes captured by a surveillance system. The capability of both the natural image contour evaluation (NICE) utility estimator, which compares contours of the reference and test images, and popular quality estimators to estimate PU is reported. The conclusions drawn from the results augment previously reported results and establish that a multi-scale implementation of NICE (MS-NICE) is the most robust utility estimator among the estimators evaluated, since MS-NICE consistently performs as well as estimators producing the most accurate perceived utility estimates for various distortion types.

关键词： Observers Image recognition Pixel transform coding Neodymium Accuracy Robustness

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Efficient Near-Optimal Dynamic Content Adaptation Applied to JPEG Slides Presentations in Mobile Web Conferencing

Efficient Near-Optimal Dynamic Content Adaptation Applied to...

引用

International Conference on Advanced Information Networking and Applications (AINA)

作者： Habib Louafi Stéphane Coulombe Umesh Chandra Department of Software and IT Engineering École de Technologie Supérieure Université du Québec Montreal QUE Canada Nokia Research Center Palo Alto CA USA

ISBN: (纸本)9781467355506

In the context of mobile Web conferencing, slide documents are generally transcoded into JPEG format and wrapped into a Web page prior to delivery. Given the diversity of these devices and their networks, dynamically identifying the optimal transcoding parameters is very challenging, as the number of transcoding parameters combinations could be very high. Current solutions use the resolution of the target mobile device and a fixed quality factor as transcoding parameters. However, this technique allows no control over the resulting file size, which, if too large, might increase the delivery time and negatively affect users' experience. Another solution (content selection) which leads to better quality consists in creating several versions and, at delivery time, selecting the best one. However, such a solution is computationally expensive. In this paper, we propose a prediction-based framework which computes near-optimal transcoding parameters dynamically with far less computations. We propose five methods based on this framework. The first predicts near-optimal transcoding parameters, while the others improve their accuracy. From the set of documents tested, two of the proposed methods reach optimality 14% and 30% of the time, respectively. Moreover, the average deviation from optimality for the proposed methods varies from 6% to 3%, with a complexity varying from 1 to 5 transcoding operations.

关键词： Transcoding transform coding Visualization Quality of service Mobile handsets Q-factor Complexity theory

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A directional extension of the JPEG image codec

A directional extension of the JPEG image codec

引用

IEEE International Symposium on Circuits and Systems (ISCAS)

作者： Marek Parfieniuk Department of Real-Time Systems Faculty of Computer Science Bialystok University of Technology Bialystok Poland

A simple directional extension of the JPEG standard is proposed, which consists in rearranging pixels in 8 × 8 blocks before the DCT-based transform coding, and then restoring the original pixel positions before putting reconstructed blocks into the decoded image buffer. Pixels are shuffled so as to improve block reconstruction accuracy and/or to decrease the number of bits to be put into a JPEG-compliant bit stream. For numerous pictures, such a straightforward adapting a signal to a transform gives evident gains in compression efficiency over the original JPEG. Even though the more advanced known algorithms offer better results, the presented solution requires less computations and memory and is more hardware friendly.

关键词： Codecs Pixel transform coding Image reconstruction Image restoration Signal restoration Decoding Streaming media Image coding Hardware

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