Title :
Radar image compression
Author :
Sabbatino, V. ; Bottalico, S.
Author_Institution :
Alenia Un´´Azienda Finmeccania, Italy
Abstract :
In this paper an algorithm based on emerging data compression techniques and suitably adapted to the radar data of a VTS (Vessel Traffic Service) System is presented. The basic idea derives from the JPEG (Joint Photographic Experts Group) standard which converts image data to a spatial frequency representation using a 2-D discrete cosine transform (DCT). It quantizes the components with different degrees of granularity, reflecting the human visual system´s spatial-frequency sensitivity then encoded using variable-length (entropy) coding. The algorithm has been analysed and implemented. An Alenia proprietary board is used for raw video data A/D conversion and to collect all data contained in user defined windows. Commercial hardware is used to run compression/decompression algorithms. The prototype collects radar data, compresses and transmits them via a telephone line to a remote console. Different tests have been performed in several European harbours and channels and some preliminary results are reported
Keywords :
data compression; 2-D discrete cosine transform; Alenia proprietary board; DCT; European harbours; JPEG standard; VTS; Vessel Traffic Service; channels; data compression; entropy coding; granularity; marine radar; radar image compression; remote console; spatial frequency representation; spatial-frequency sensitivity; telephone line; variable-length coding; video data A/D conversion;
Conference_Titel :
Radar 97 (Conf. Publ. No. 449)
Conference_Location :
Edinburgh
Print_ISBN :
0-85296-698-9
DOI :
10.1049/cp:19971771