Filters








128 Hits in 4.9 sec

Quality-aware selection of quality factor and scaling parameters in JPEG image transcoding

Stephane Coulombe, Steven Pigeon
2009 2009 IEEE Symposium on Computational Intelligence for Multimedia Signal and Vision Processing  
We propose a quality-aware transcoding system which considers the quality of transcoded images when QF and scaling are selected jointly.  ...  Reducing the file size of a JPEG image to meet bandwidth or terminal constraints is a common transcoding operation.  ...  Let I be a JPEG compressed image and QF(I), S(I), W(I), and H(I) its quality factor, compressed file size, width, and height respectively.  ... 
doi:10.1109/cimsvp.2009.4925650 dblp:conf/cimsivp/CoulombeP09 fatcat:ubafkjpzqzbz3mwmfgsxzdcx3q

Multimedia Web services for mobile clients using quality aware transcoding

Surendar Chandra, Carla Schlatter Ellis, Amin Vahdat
1999 Proceedings of the 2nd ACM international workshop on Wireless mobile multimedia - WOWMOM '99  
We exploit technology that we had previously developed that characterized the quality versus size tradeoffs in transcoding JPEG images.  ...  We show that policies that aggressively transcode the larger images can produce images with Quality factor values that closely follow the un-transcoded base case while still saving as much as 150 KB.  ...  In our earlier work [3] , we characterized the tradeoffs inherent to a transcoding that changes a JPEG compression metric, such as the JPEG Quality factor.  ... 
doi:10.1145/313256.313287 dblp:conf/wowmom/ChandraEV99 fatcat:jxpgdpmshnfhhg555aflmxlnnq

Computationally efficient algorithms for predicting the file size of JPEG images subject to changes of quality factor and scaling

Steven Pigeon, Stephane Coulombe
2008 2008 24th Biennial Symposium on Communications  
As both algorithms rely on machine-learning strategies, a large corpus of representative JPEG images was assembled.  ...  The first algorithm, QF Scaling-Aware Prediction, predicts file size based on the QF of the original picture, as well as a target QF and scaling.  ...  quality of the transcoded image, etc.  ... 
doi:10.1109/bsc.2008.4563280 fatcat:4sxud27wfjgkvjyuk2lm2tnl2i

Application-level differentiated multimedia Web services using quality aware transcoding

S. Chandra, C.S. Ellis, A. Vahdat
2000 IEEE Journal on Selected Areas in Communications  
We show that policies that aggressively transcode the larger images can produce images with Quality Factor values that closely follow the un-transcoded base case while still saving as much as 150 KB.  ...  We leverage our earlier work on characterizing quality versus size tradeoffs in transcoding JPEG images to supply more information for determining the quality and size of the object to transmit.  ...  We use the JPEG compression metric as the informed transcoding technique.  ... 
doi:10.1109/49.898736 fatcat:oqrhp2wodvbtlcmwsur7gjrj44

Low-Complexity Transcoding of JPEG Images With Near-Optimal Quality Using a Predictive Quality Factor and Scaling Parameters

Stéphane Coulombe, Steven Pigeon
2010 IEEE Transactions on Image Processing  
A common transcoding operation consists of reducing the file size of a JPEG image to meet bandwidth or device constraints.  ...  We then propose a novel low-complexity JPEG transcoding system which delivers near-optimal quality.  ...  We also proposed two quality-aware transcoding systems: an optimal quality JPEG transcoding (OQJT) system and a near-optimal quality JPEG transcoding (NOQJT) system.  ... 
doi:10.1109/tip.2009.2036716 pmid:19955037 fatcat:qzzvnul5t5abbbrue3onompoj4

Managing the storage and battery resources in an image capture device (digital camera) using dynamic transcoding

Surendar Chandra, Carla Schlatter Ellis, Amin Vahdat
2000 Proceedings of the 3rd ACM international workshop on Wireless mobile multimedia - WOWMOM '00  
We show that this technique can allow the camera to store an order of magnitude more images. For a moderate number of images (e.g. 40), transcoding techniques can also maintain high quality images.  ...  Storage technologies with expensive read and write operations (such as micro disks) can have a minor negative impact on battery life because of the extra read and write operations associated with transcoding  ...  In our companion work [3] , we characterized the tradeoffs inherent to a transcoding that changed a JPEG compression metric, such as the JPEG Quality Factor [3] .  ... 
doi:10.1145/345867.345897 dblp:conf/wowmom/ChandraEV00 fatcat:towbnab4mvc2nmmpfxdwv5fiwe

Reducing Storage in Large-Scale Photo Sharing Services using Recompression [article]

Xing Xu, Zahaib Akhtar, Wyatt Lloyd, Antonio Ortega, Ramesh Govindan
2019 arXiv   pre-print
ROMP is a lossless JPEG recompression codec that compresses typical photos 15% over standard JPEG.  ...  L-ROMP is a lossy JPEG recompression codec that distorts photos in a perceptually un-noticeable way and typically achieves 28% compression over standard JPEG.  ...  (a): Using PSNR as the quality metric, and showing performance on JPEG images of four quality parameters (70,80,86,90).  ... 
arXiv:1912.11145v1 fatcat:ma4nxyoocva7zpmmwg7hvdfmau

Quality-aware predictor-based adaptation of still images for the multimedia messaging service

Steven Pigeon, Stéphane Coulombe
2013 Multimedia tools and applications  
We show that the proposed solutions lead to noticeably superior image quality and faster transcoding times than comparable algorithms offered in products currently on the market and those described in  ...  In this work, we propose novel predictor-based dynamic programming approaches to MMS adaptation, which provide a framework for explicit maximization of the user experience, rather than relying on heuristics  ...  779 images with various distortions, such as JPEG compression and blurring (which is similar to the scaling considered in this paper) [40] .  ... 
doi:10.1007/s11042-013-1481-1 fatcat:icc5dyev7vflzlvrou5f2cvdeq

Dynamic Rate Control for JPEG 2000 Transcoding

Derek Schwenke, Anthony Vetro, Toshihiko Hata, Naoki Kuwahara
2006 2006 IEEE International Conference on Multimedia and Expo  
This paper describes a rate control algorithm for a streaming video system that dynamically transcodes stored JPEG 2000 frames.  ...  The proposed algorithm is designed to improve overall quality over a static rate control method by increasing bandwidth utilization, while satisfying buffer constraints and maintaining consistent quality  ...  In this system, an image sequence is encoded and stored as a JPEG 2000 bitstream, and then the stored images are efficiently transcoded in the compressed-domain using a low-complexity adaptation technique  ... 
doi:10.1109/icme.2006.262811 dblp:conf/icmcs/SchwenkeVHK06 fatcat:2jgcbhry4rfbxoi2qb5hsmyc7e

Optimal quality-aware predictor-based adaptation of multimedia messages

Steven Pigeon, Stephane Coulombe
2011 Proceedings of the 6th IEEE International Conference on Intelligent Data Acquisition and Advanced Computing Systems  
quality as estimated by the structural similarity image quality index.  ...  In this work, we propose a generic adaptation scheme based on predictors for file size and image quality resulting from transcoding parameters applied to a given image that will explicitly maximize perceived  ...  of quality-aware optimization.  ... 
doi:10.1109/idaacs.2011.6072803 dblp:conf/idaacs/PigeonC11 fatcat:dbiw3nccz5fnticpbt2iaofev4

Quality Prediction-Based Dynamic Content Adaptation Framework Applied to Collaborative Mobile Presentations

Habib Louafi, Stephane Coulombe, Umesh Chandra
2013 IEEE Transactions on Mobile Computing  
To quantify the quality of the adapted content, we introduce a measure of the quality of the experience based on its visual quality of the adapted content, as well as on the impact of its total delivery  ...  In this paper, we propose a dynamic framework that enables us to estimate transcoding parameters on the fly in order to generate near-optimal adapted content for each user.  ...  From (4), the visual quality of the adapted components is set to 1 for text, and for images it is defined as the adapted image's quality using a given quality metric (e.g., SSIM).  ... 
doi:10.1109/tmc.2012.173 fatcat:h4j5t3zngvd35mvnf7hbp2ijnm

Metadata-driven multimedia access

P. van Beek, J.R. Smith, T. Ebrahimi, T. Suzuki, J. Askelof
2003 IEEE Signal Processing Magazine  
He works in still-image compression, universal multimedia access, and augmented reality.  ...  He has been involved in the standardization of JPEG2000 since 1998, both as co-editor of JPEG2000 part 5 (reference software) and currently as the head of the Swedish delegation.  ...  Transcoding of JPEG 2000 Images The new still image compression standard JPEG 2000 [36] , [37] has been developed with the intention of facilitating access of digital still images with various devices  ... 
doi:10.1109/msp.2003.1184338 fatcat:unyzcpre5jfwrh5qnwiwf4ecty

Image privacy protection with secure JPEG transmorphing

Lin Yuan, Touradj Ebrahimi
2017 IET Signal Processing  
In this study, the authors propose secure JPEG transmorphing, a framework for protecting image visual privacy in a secure, reversible, and highly flexible and personalised manner.  ...  segments (APPn markers) of the visually obfuscated JPEG image.  ...  that JPEG image compressed with QF of 70 or 80 usually maintains fairly high quality.  ... 
doi:10.1049/iet-spr.2016.0756 fatcat:zadif6p54zelbdbzsmbvpkujca

JPEG Pleno: Providing representation interoperability for holographic applications and devices

Peter Schelkens, Touradj Ebrahimi, Antonin Gilles, Patrick Gioia, Kwan-Jung Oh, Fernando Pereira, Cristian Perra, Antonio M. G. Pinheiro
2019 ETRI Journal  
K E Y W O R D S coding, compression, holography, JPEG Pleno, quality assessment, standardization  ...  Since its first JPEG standard in 1992, the Joint Photographic Experts Group (JPEG) has published several image coding standards that have been successful in a plethora of imaging markets.  ...  of visual content: moving from a planar, 2D world, towards imaging in volumetric and contextually aware modalities.  ... 
doi:10.4218/etrij.2018-0509 fatcat:fpzrycmw3vhvrkgq7qp2l4tdgu

Front Matter: Volume 7073

Proceedings of SPIE, Andrew G. Tescher
2008 Applications of Digital Image Processing XXXI  
Papers are published as they are submitted and meet publication criteria.  ...  The papers published in these proceedings reflect the work and thoughts of the authors and are published herein as submitted.  ...  Larabi, Univ. of Poitiers, XLIM-SIC, UMR CNRS 6172 (France) 7073 0Z A comparative study of color image compression standards using perceptually driven quality metrics [7073-36] F. De Simone, D.  ... 
doi:10.1117/12.815022 fatcat:bt67a4rrovb7xjoqnlq75pyici
« Previous Showing results 1 — 15 out of 128 results