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| 국가/구분 | United States(US) Patent 등록 |
|---|---|
| 국제특허분류(IPC7판) |
|
| 출원번호 | US-0461881 (1990-01-05) |
| 발명자 / 주소 |
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| 출원인 / 주소 |
|
| 인용정보 | 피인용 횟수 : 485 인용 특허 : 0 |
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 alterna
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.
A method of generating a signal representative of information encoded in a machine-readable label, (A) said machine-readable label including at least two rows of codewords, one row adjacent to and beneath another (B) each said codeword representing at least one information-bearing character and bein
A method of generating a signal representative of information encoded in a machine-readable label, (A) said machine-readable label including at least two rows of codewords, one row adjacent to and beneath another (B) each said codeword representing at least one information-bearing character and being selected from among a set of detectable mark/space patterns, (C) each said mark/space pattern having a determinable discriminator function value and comprising a pattern of marks and spaces, each said mark and space being representative of one of a plurality of different states, (D) each said row having codewords selected from one of a plurality of subsets of said mark/space patterns, each said subset comprising mark/space patterns having discriminator function values that are mutually exclusive of discriminator values corresponding to the mark/space patterns comprising any other subset, said method including the steps of: (a) scanning the codewords; (b) computing the discriminator function value for each of the scanned codewords; (c) determining, from the value of the computed discriminator function, the row containing each of the scanned codewords; (d) decoding each of the scanned codewords to obtain a plurality of corresponding symbolic values; and (e) generating a signal representative of the presence of each of said corresponding symbolic values in the determined row.
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