发明名称 |
High density two dimensional symbol set |
摘要 |
<p>A nonvolatile electro-optical read-only memory includes a substrate on which is printed (or otherwise inscribed) a complex symbol or "label" with a high density two-dimensional symbology, a variable number of component symbols or "codewords" per row, and a variable number of rows. Codewords in alternating rows are selected from mutually exclusive subsets of a mark pattern such as a (17.4) mark pattern. The subsets are defined in terms of particular values of a discriminator function, which is illustrated as being a function of the widths of bars and spaces in a given codeword. In the illustrated embodiment, each subset includes 929 available codewords; that, plus a two-step method of decoding scanned data, permitting significant flexibility in defining mappings of human-readable symbol sets into codewords. The memory may be used in conjunction with a scanner and a suitable control system in a number of applications, e.g., robotic operations or automated microfilm searching. <IMAGE></p> |
申请公布号 |
EP0733991(A2) |
申请公布日期 |
1996.09.25 |
申请号 |
EP19950203430 |
申请日期 |
1990.10.10 |
申请人 |
SYMBOL TECHNOLOGIES, INC. |
发明人 |
PAVLIDIS, THEODOSIOS;WANG, YNJUIN PAUL;SWARTZ, JEROME |
分类号 |
G06F3/00;G06F9/44;G06F9/445;G06K1/12;G06K7/14;G06K17/00;G06K19/06;H04N1/00;H04N1/32;(IPC1-7):G06K19/06 |
主分类号 |
G06F3/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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