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Real‐time distortionless high‐factor compression scheme
Author(s) -
Liénard Jean
Publication year - 1989
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.596309
Subject(s) - huffman coding , computer science , data compression , lossless compression , computer hardware , data acquisition , process (computing) , real time computing , algorithm , operating system
Nowadays, digital subtraction angiography systems must be able to sustain real‐time acquisition (30 frames per second) of 512×512×8 bit images and store several sequences of such images on low cost and general‐purpose mass memories. Concretely, that means a 7.8 Mbytes per second rate and about 780 Mbytes disk space to hold a 100‐s cardiac examination. To fulfill these requirements at competitive cost, a distortionless compressor/decompressor system can be designed: during acquisition, the real‐time compressor transforms the input images into a lower quantity of coded information through a predictive coder and a variable‐length Huffman code. The process is fully reversible because during review, the real‐time decompressor exactly recovers the acquired images from the stored compressed data. Test results on many raw images demonstrate that real‐time compression is feasible and takes place with absolutely no loss of information. The designed system indifferently works on 512 or 1024 formats, and 256 or 1024 gray levels.