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    11.
    发明专利
    未知

    公开(公告)号：AT167318T

    公开(公告)日：1998-06-15

    申请号：AT91122395

    申请日：1991-12-30

    Applicant: SYMBOL TECHNOLOGIES INC

    Inventor： JOSEPH EUGENE BERNARD ,  PAVLIDIS THEODOSIOS

    IPC: G06K7/00 ,  G06K7/14 ,  G06K19/06

    Abstract: A method for decoding information contained in an analog waveform representative of a bar code symbol comprising the steps of identifying a decodable portion of an analog waveform; processing said decodable portion to obtain a plurality of waveform descriptors; and performing a high and low density decoding process to one or more of said plurality of waveform descriptors for decoding information contained in either a high or low density symbol respectively, is disclosed. The high density decoder used for decoding high density symbols utilizes extrema extents, i.e., areas of the peaks and valleys of the analog waveform which directly correlate to the size of the bars/spaces of a high density bar code. After locating the seed point of the waveform, each extrema extent is generated and thresholded at each peak/valley location to decide its size. The high density decoder is adaptive in that the thresholding extent value is updated as the solution grows away from the seed point. The low density decoder used for decoding low density symbols utilizes the widths of the peaks/valleys for decoding purposes and utilizes a histogramming and backtracking technique for removing noise levels from the analog waveform. Backtracking allows another decode attempt to be made if one is unsuccessful.

    HIGH DENSITY TWO DIMENSIONAL SYMBOLOGY
    15.
    发明专利
    HIGH DENSITY TWO DIMENSIONAL SYMBOLOGY 未知

    公开(公告)号：CA2026387A1

    公开(公告)日：1991-07-06

    申请号：CA2026387

    申请日：1990-09-27

    Applicant: SYMBOL TECHNOLOGIES INC

    Inventor： PAVLIDIS THEODOSIOS ,  WANG YNJUIN P ,  SWARTZ JEROME

    IPC: G06F3/00 ,  G06F9/44 ,  G06F9/445 ,  G06K1/12 ,  G06K7/14 ,  G06K17/00 ,  G06K19/06 ,  H04N1/00 ,  H04N1/32 ,  G06K7/00 ,  G06E1/00 ,  G06E3/00

    Abstract: 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 "codeword' per row, and a variable 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. Docket 059/SYMB:022 890928 Page 65

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