ROI-Based SNR Scalable JPEG2000 Image Transcoding

摘要

This paper presents a quality scalable Region-of-Interest (ROI) transcoding technique for JPEG2000 image transmission over narrowband networks. The proposed scheme employs a structure analysis of the bitstream, packet extraction and reorganization, as well as a prioritization of ROIs and background with desired qualities. Since the proposed scheme does not involve any re-encoding operation, either for the wavelet coefficients or for the packet header, it has very low complexity. This paper studies the output picture quality of various transcoder configurations, discusses the bandwidth savings achieved by the scheme and also presents a complexity evaluation. Experimental results show that significant bandwidth reduction for image transmission is achieved and image quality for monitoring surveillance video is maintained with a very minimal amount of complexity in the transcoder.