Content-based retransmission with error concealment for astronomical images

Details Content-based retransmission with error concealment for astronomical images Content-based retransmission with error concealment for astronomical images

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005spie.6015..187t&link_type=abstract

Multimedia Systems and Applications VIII. Edited by Vetro, Anthony; Chen, Chang Wen; Kuo, C.-C. J.; Zhang, Tong; Tian, Qi; Smit

Computer Science

Multimedia

Scientific paper

The James Webb Space Telescope (JWST) is expected to produce a vast amount of images that are valuable for astronomical research and education. To support research activities related to JWST mission, NASA has provided funds to establish the Structures Pointing and Control Engineering (SPACE) Laboratory at the California State University, Los Angeles (CSULA). One of the research activities in SPACE lab is to design an effective and efficient transmission system to disseminate JWST images across the Internet. This paper presents a prioritized transmission method to provide the best quality of the transferred image based on the joint-optimization of content-based retransmission and error concealment. First, the astronomical image is compressed using a scalable wavelet-based approach, then packetized into independently decodable packets. To facilitate the joint-optimization of two mutually dependent error control methods, a novel content index is declared to represent the significance of the packet content as well as its importance in error concealment. Based on the defined content index, the optimal retransmission schedule is determined to maximize the quality of the received image under delay constraint with the given error concealment method. Experimental results demonstrate that the proposed approach is very effective to combat the packet loss during transmission to achieve a desirable quality of the received astronomical images.

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