< BK21 플러스 BEST 정보기술 사업단 세미나 개최 안내 >

개최일시 : 2015년 7월 7일 화요일 11:00 ~ 12:00

개최장소 : 제2공학관  B701호

세미나 제목 : Rateless Lossy Compression via the Extremes

발표초록 : 

In this talk, I will describe a new scheme for successively refinable lossy compression.

In each iteration, the encoder merely describes the indices of the few maximal source components,

while the decoder’s reconstruction is a natural estimate of the source components

based on this information. This step can be shown to be near-optimal for the memoryless

Gaussian source in the sense of achieving the zero-rate slope of its distortion-rate function.

I will then introduce a scheme comprising of iterating the above iteration

on an appropriately transformed version of the difference between the source and

its reconstruction from the previous iteration. The proposed scheme achieves the rate distortion

function of the Gaussian memoryless source (under squared error distortion) when employed

on any finite-variance ergodic source. Its storage and computation requirements are modest

at both the encoder and decoder. It further possesses desirable properties which I will discuss, which

we respectively refer to as infinitesimal successive refinability, ratelessness, and complete separability.

Our work provides new insights regarding video and image compression

as well as bio data compression such as genomic data.

Based on joint work with Tsachy Weissman.

강연자 : 노승문 박사 / Stanford University

초청자 : 전기전자공학과 교수 김광순