Prof. Touradj Ebrahimi, EPFL, Switzerland

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"JPEG emerging standards"

Title: JPEG emerging standards
Date: June 9th 2015
Time: 15:45
Place: L111, Campus Sundsvall, Mid Sweden University

JPEG standardisation committee has played an important role in the digital revolution in the last quarter of century. The legacy JPEG format, which became an international standard 21 years ago is the dominant picture format in many imaging applications. This dominance does not seem to slow down when observing that the number of JPEG images uploaded to social networks alone has surpassed 2 billions per day in 2014, when compared to less than a 1 billion the year before. JPEG 2000, which became an international standard 15 years ago, has been the format of choice in a number of professional applications, among which contribution in broadcast and digital cinema are two examples.

The ever changing requirements in multimedia applications, have created new challenges in imaging for which solutions should be found. Among others, content annotation, search and management,  security and in particular privacy, efficient low complexity and low latency storage and transmission, seamless communication, new imaging modalities, and enhanced imaging experiences are  just a few examples of challenges to which scientific community, industry, service providers, and entrepreneurs need to respond.

This talk starts by providing an overview of a recently developed image format to deal with High Dynamic Range content called JPEG XT. JPEG XT has been defined to be backward compatible with the legacy JPEG format in order to facilitate its use in current imaging ecosystem.

We will then discuss JPEG PLENO, a recent initiative by JPEG committee to address an emerging modality in imaging, namely, plenoptic imaging. “Pleno” is a reference to “Plenoptic” a mathematical representation, which not only provides color information of a specific point in a scene, but also how it changes when observed from different directions and distances. “Pleno” is also the latin word for “complete”, a reference to the vision of the JPEG committee that believes future imaging will provide a more complete description of scenes well beyond what is possible today.

The road-map for JPEG Pleno follows a path that starts in 2015 and will continue beyond 2020, with the objective of making the same type of impact that the original JPEG format has had on today's digital imaging starting from 20 years ago. Several milestones are in work to approach the ultimate image representation in well-thought, precise, and useful steps. Each step could potentially offer an enhanced experience when compared to the previous, immediately ready to be used in applications.

The talk will conclude with an quick overview of two potential standardisation initiatives under investigation. The first, referred to as JPEG AIC (Advanced Image Coding) aims at standardisation of a new image compression standard offering not only superior compression efficiency when compared to JPEG and JPEG 2000 but also providing other features attractive for multimedia applications of tomorrow. The second has for objective standardisation of an image compression format that puts an emphasis on low latency, low complexity and transparent quality as well as low cost, desirable in a number of applications, including broadcasting and high bandwidth links between devices and displays

Touradj Ebrahimi received his Msc and PhD in Electrical Engineering from EPFL in 1989 and 1992 respectively. He then joined Sony Corporation in Tokyo Japan as a research engineer from 1992 to 1993. He was a researcher at AT&T Bell Laboratories in Holmdel, USA from 1993 to 1993 until he joined EPFL as a professor of image processing heading its multimedia signal processing group. Professor Ebrahimi was also an adjunct professor at NTNU in Trondheim, Norway, from 2009 to 2013. He is the founding chair of QoMEX, a conference in the field of quality of experience in multimedia, and initiated and has been chairing Qualinet, the COST Action IC1003 around the same topic. Professor Ebrahimi has been very involved in standardization of many image and video compression standards in JPEG and MPEG, and is currently the Convenor of JPEG.

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