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1. 发明授权

US06385341B1 Technique for decoding variable length data codes 失效
标题翻译：解码可变长度数据码的技术
公开(公告)号：US06385341B1
公开(公告)日：2002-05-07
申请号：US08843933
申请日：1997-04-17
申请人： Rafael Lisitsa , Gregory Stepanets
发明人： Rafael Lisitsa , Gregory Stepanets
IPC分类号： G06K946
CPC分类号： G06T9/005
摘要： A system for the efficient decoding of data encoded with variable length codes uses an N-bit buffer as an index to a data look-up table or other suitable data structure. The encoded data is stored in an encoded data storage area and extracted N bits at a time. The N bits are used as an index or indicator to a location within the data look-up table. The contents of the data look-up table in the indicated location correspond to one or more decoded tokens and also provide an indication of the number of data bits from the N-bit buffer that were used to represent the decoded tokens. A pointer is incremented by the number and indicates a location within the encoded data storage area where the next N bits will be extracted and stored in the buffer. If the N-bit buffer is greater than or equal to the maximal length for the variable codes, at least one valid token is guaranteed as a result of a single data look-up operation. However, a data look-up operation typically results in a plurality of decoded tokens. In one embodiment, the decoding system is used for facsimile operation and may include additional data in the data look-up table to permit rapid decoding of two dimensional facsimile codes.
摘要翻译：用于以可变长度代码编码的数据的有效解码的系统使用N位缓冲器作为数据查找表或其他合适的数据结构的索引。编码数据存储在编码数据存储区域中，并一次提取N位。 N位用作数据查找表中的位置的索引或指示符。指示位置中的数据查找表的内容对应于一个或多个解码令牌，并且还提供来自用于表示解码令牌的N位缓冲器的数据位数的指示。指针增加数字，并指示编码数据存储区域内的下一个N位将被提取并存储在缓冲器中的位置。如果N位缓冲器大于或等于可变代码的最大长度，则由于单个数据查找操作，至少有一个有效令牌得到保证。然而，数据查找操作通常导致多个解码令牌。在一个实施例中，解码系统用于传真操作，并且可以在数据查找表中包括附加数据，以允许二维传真码的快速解码。

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