The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 29, 2000
Filed:
Mar. 18, 1998
Fujio Ikegami, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
When input data composed of a symbol string is compressed, bit maps are used. In each bit map, '1' is set to a bit that represents the position of a relevant symbol of the symbol string. In contrast, '0' is set to a bit that represents the position of another symbol of the symbol string. When compressed data is expanded, symbols are expanded in the order thereof. Thus, the positions of symbols that have been expanded are omitted from each bit map. Consequently, each bit map can be shortened and thereby the compression ratio can be improved. Since the length of each bit map is variable, a value of which (the number of symbols expanded by corresponding bit map-2) is added as information for expanding symbols from each variable bit map of the compressed data correctly. In addition, to distinguish data having a bit map from data having no bit map, a flag that represents the presence of a bit map is added to the compressed data.