error-resilient video coding in the iso mpeg-4 standard Bath Springs Tennessee

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error-resilient video coding in the iso mpeg-4 standard Bath Springs, Tennessee

MPEG-4 Committee has also taking the approach of“versioning” to the standard formation process. He holds a BS from the California Institute of Technology, and MS and PhD degrees from Stanford University, all in Applied Physics. Alan Bensky, MScEE, an electronics engineering consultant with over 25 years of experience in analog and digital design, management, and marketing. Correia, Philip A Chou, Mihaela van der Schaar, W.

She is now with C-Cube Microsystems, Milpitas, CA 95035 USA(e-mail: [email protected]).S. Moreover, an additional 2.5–3 dBcan be recovered by inserting resynchronization marker at eachbit-plane level. He has given numerous talks and classes on radio-frequency identification in the US and Asia. He is a member of the IBM Academy of Technology and co-leader of the Academy study “Innovation Ecosystems .

His research interests cover wireless and satellite communications, with a specific focus on channel characterization and modeling. There are threedifferent quantization modes for the MPEG-4 VTC: 1) singlequantizer mode, 2) multiple quantizer mode, and 3) bilevelquantizer mode. Correia,Philip A. Additional details on the MPEG-4 video error resiliencetools can be found in [29].1) Resynchronization: When the compressed data are trans-mitted over noisy communication channels, errors are intro-duced into the bit-stream.

JPEG-2000, following the same approach used byMPEG-4, does not plan to standardize any error concealmentmethod. MPEG-4 adopts a packet approach. Bovik is a recipient of the IEEE Signal Processing Society Meritorious Service Award (1998), and is a two-time Honorable Mention winner of the international Pattern Recognition Society Award. To mitigate the effect of losses, error resilience [2, 3] is incorporated in the encoder and error concealment [4, 5] is done at the decoder.

To protect the important data in real time and improve the quality of service as far as possible, we have taken a variety of measures, including the scalable layered coding, the This shows how seg-ments improve data recovery. Last–U. The intercoded VOP’s can either be for-ward (P-VOP) or bidirectionally (B-VOP) predicted.

MPEG-4 Error Resilience ResultsAll the tools that have been accepted into the MPEG-4 stan-dard havebeen thoroughly evaluated and independently verifiedby two parties before being accepted. The hierarchical struc-ture of the packets follows the hierarchical structure of the dataintroduced by the wavelet-based bit-plane entropy coder. Institutional Sign In By Topic Aerospace Bioengineering Communication, Networking & Broadcasting Components, Circuits, Devices & Systems Computing & Processing Engineered Materials, Dielectrics & Plasmas Engineering Profession Fields, Waves & Electromagnetics General The DWT decomposes the inputimage into subbands of varying resolutions.

The erroris detected in several ways (checking if the number of units de-coded corresponds to “U. Hence,in MPEG-4 RVLC’s are used in the data partitioning modewhich modifies the bit-stream syntax such that all the DCTcoefficients occur together. Comparison to JPEGWe have compared the error-resilient technique ofJPEG-2000 to the JPEG standard [4]. For thisreason, the adopted error resilience tools are meant to be usedtogether with, and not in place of, traditional technologies, suchas channel coding, which are outside the scope of the two

Wavelet- and subband-based technology has matured.Also, many limitations and shortcomings of the JPEG standardhave been discovered and widely recognized. His research interests cover wireless communications. Test image “Woman” compressed at 0.5 bpp: (a) the error-free image withdB, and (b) the corrupted image with resynchronizationmarkers at bit-plane level anddB. Ling, Ronald Kitchen, Daniel M.

If some ofthis information is corrupted due to channel errors, the decoderhas no other recourse but to discard the current video frame orthe current visual texture.To reduce the sensitivity of these He is also Founder and Director of Hudson Valley FIRST Lego League (http://www.facebook.com/HudsonValleyFLL) which offers over 1,000 students each year the opportunity to pursue their interest in science and technology. He is an IBM Master Inventor with over 100 patents, and recipient of several industry awards, including the IEEE Kiyo Tomiyasu Award, the Sigma Xi Walston Chubb Award for Innovation, the Even if thearithmetic decoder flags an error, its adaptive nature does notallow decoding the next uncorrupted data.

Fette,Keith Jack,Farid Dowla,Casimer DeCusatis,Ed da Silva,Luis M. Bovik, Bruce A. The specific tools adopted into the ISO MPEG-4 standard to enable the communication of compressed video data over noisy wireless channels are presented in detail. Casimer DeCusatis is an IBM Distinguished Engineer and technical executive based in Poughkeepsie, N.Y.

The encoder also modifies the predictiveencoding method used for coding the motion vectors such thatthere are no predictions across the video packet boundaries.b) MPEG-4 visual texture packet: Following theMPEG-4 video encoder Resynchronization at bit-plane level results inan overhead of up to 1% of the total bit-rate. Beside efficientcom-pression, MPEG-4 VTC supports i) coding of arbitrarily shapedobjects, ii) spatial and quality scalability of both rectangular andarbitrarily shaped object, iii) error robustness in error-prone en-vironments, and iv) tiling [32].The MPEG-4 is capable of coding both conven-tionalrectangular video as well as arbitrarily shaped 2-D objectsina video scene.The basic unitof coding of theMPEG-4 naturalvideo coder is the video object plane (VOP).

Due to its predictive nature, error accumulates cumulatively, as exact prediction is not possible. Therefore, bit error will not propagate fromone block to the next as long as block synchronization ismaintained. Finally, it is not aimed as a substitute or manual for the MPEG-4 standard, but rather as a tutorial focused on the principles and algorithms underlying it. He is a member of the Institute of Electrical and Electronic Engineers (IEEE) and Sigma Xi.

It should be noticedthat how frequently the HEC is used to duplicate the header data MOCCAGATTA et al.: ERROR-RESILIENT CODING IN JPEG-2000 AND MPEG-4 911isan encoderissue, andis thereforeoutside the scopeof the He held research or visiting positions at Université catholique de Louvain, Stanford University, EURECOM and Samsung Electronics. He was the Chairman of the Technical Programme Committee of PIMRC’2002. In addition, she was a technical manager at Lotus/IBM for the southern, mid-Atlantic, and eastern regions of the United States.

These frames can be grouped to form a Group of Pictures (GOP). and Ph.D. After detecting theerror, the decoder resynchronizes with the encoder by searchingfor the next resynchronization marker. Due to the nature of thedata, the error is usually detected some undefineddistance awayfrom where the error occurred.

Note the motion vectors are predictively codedwith respect to the neighboring motion vectors and hencewe code only the motion vector differences.• DCT(s) are the 64 DCT coefficients that are run lengthencoded.In