Improved region-of-interest image coder and its application

Abstract

In this paper we incorporate multiple ROI coding and data embedded functionalities into the SPIHT codec with the reversible two-ten integer wavelet transform, and propose two improvement schemes of the SPIHT algorithm and utilize a context-based adaptive arithmetic coder to further enhance coding efficiency. Each ROI has individual ellipse or rectangle shape model and possesses its own priority (reconstruction speed). The priority decides the order of processing for the coefficients at encoder and decoder In addition, we propose a method called Odd and Even Number Attachment (OENA) to embed data. The data can be a meaningful image or useful text for some special applications such as digital cameras and digital libraries. We implement a remote monitor system to integrate all techniques. In this system, the luminance is compressed by an improved SPIHT codec, and the chrominance is embedded into the bitstream by OENA. The guarder can decide to use ROI or not, and the bit-rates to transmit to network.