Protection of arbitrarily shaped objects in generalized multiple description coding.

摘要

Multiple Description Coding (MDC) is a source coding technique that protects against packet loss in networks. Although MDC has been an active research area in the past few years, only a few methods address protection of Regions of Interest (ROI) in the presence of packet loss. The object-based coding technique can not only provide great flexibility for transmitting arbitrarily shaped visual objects in multimedia applications but can also potentially improve the quality of visual objects at low bit rates. Motivated by the merits of the object-based coding technique, in my thesis, I design and implement an algorithm to protect arbitrarily shaped ROI in Multiple Description Image Coding. I propose two methods and combine the object-based coding technique with two types of MDC frameworks. Since my methods can reduce the size of the ROI, we can not only improve the quality of the ROI, but also improve the quality of the whole image. Compared with the methods in literature, my methods can give considerably better results.