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公开(公告)号：DE69825388D1
公开(公告)日：2004-09-09
申请号：DE69825388
申请日：1998-10-16
Applicant: XEROX CORP
Inventor： FLEET DAVID J , HEEGER DAVID J , CASS TODD A , HECHT DAVID L
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公开(公告)号：DE69428420T2
公开(公告)日：2002-05-02
申请号：DE69428420
申请日：1994-12-06
Applicant: XEROX CORP
Inventor： HECHT DAVID L , PETRIE GLEN W
Abstract: An optically readable record (35) for storing encoded information comprises (1) a recording medium (35), (2) a self-clocking data code (32) for encoding the information, with this data code (32) being composed of glyphs (34) that are written in a bounded two dimensional code field on said recording medium (35) on centers that are spatially distributed in nominal accordance with a predetermined spatial formatting rule, and the glyphs (34) being defined by respective symbols that are selected from a finite set of optically discriminable symbols to encode said information, and (3) a self-clocking address pattern (33) written on said recording medium (35) to extend across said code field along at least one axis, with this address pattern being composed of unique a glyph patterns (37) that disambiguates spatiallogical position within said address pattern (33) to a subpattern precision.
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公开(公告)号：DE69230027D1
公开(公告)日：1999-10-28
申请号：DE69230027
申请日：1992-12-21
Applicant: XEROX CORP
Inventor： HECHT DAVID L , STEARNS RICHARD G , PRASADAM FLORES NOAH L
IPC: G06K1/12 , G06K19/06 , G06V30/224 , G06K9/18
Abstract: A self-clocking glyph code (23) is provided for encoding n-bit long digital values (where n>1) in a logically ordered sequence of composite glyphs (31a-31d) that are written, printed, or otherwise recorded on a hardcopy recording medium in accordance with a predetermined spatial formatting rule. As used herein, a "composite glyph" is a graphical symbol that has a plurality of predefined, substantially orthogonal, graphical characteristics; each of which is capable of assuming any one of a plurality of predefined graphical states. An n-bit long digital value is distributively encoded in a glyph of this type by decomposing its n-bits, prior to or during the encoding, into a plurality of shorter, ordered, non-overlapping bit strings. The digital values of these bit strings, in turn, are encoded in the states of respective graphical characteristics of the composite glyph in a predetermined logical order, thereby preserving the logical ordering of the bit strings.
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公开(公告)号：DE69130786T2
公开(公告)日：1999-06-10
申请号：DE69130786
申请日：1991-07-30
Applicant: XEROX CORP
Inventor： BLOOMBERG DAN S , HECHT DAVID L , TOW ROBERT F , FLORES L PRASADAM
IPC: G06K7/016 , G06K19/00 , G06K19/06 , G06V30/224 , G06K1/12
Abstract: This invention provides self-clocking glyph shape codes for encoding digital data (35) in the shapes of glyphs (36) that are suitable for printing on hardcopy recording media. Advantageously, the glyphs (36) are selected so that they tend not to degrade into each other when they are degraded and/or distorted as a result, for example, of being photocopied, transmitted via facsimile, and/or scanned-in to an electronic document processing system. Moreover, for at least some applications, the glyphs (36) desirably are composed of printed pixel patterns containing nearly the same number of ON pixels and nearly the same number of OFF pixels, such that the code that is rendered by printing such glyphs (36) on substantially uniformly spaced centers appears to have a generally uniform texture. In the case of codes printed at higher spatial densities, this texture is likely to be perceived as a generally uniform gray tone. Binary image processing and convolution filtering techniques for decoding such codes also are disclosed, but this application focuses on the codes.
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公开(公告)号：DE69130786D1
公开(公告)日：1999-03-04
申请号：DE69130786
申请日：1991-07-30
Applicant: XEROX CORP
Inventor： BLOOMBERG DAN S , HECHT DAVID L , TOW ROBERT F , FLORES L PRASADAM
IPC: G06K7/016 , G06K19/00 , G06K19/06 , G06V30/224 , G06K1/12
Abstract: This invention provides self-clocking glyph shape codes for encoding digital data (35) in the shapes of glyphs (36) that are suitable for printing on hardcopy recording media. Advantageously, the glyphs (36) are selected so that they tend not to degrade into each other when they are degraded and/or distorted as a result, for example, of being photocopied, transmitted via facsimile, and/or scanned-in to an electronic document processing system. Moreover, for at least some applications, the glyphs (36) desirably are composed of printed pixel patterns containing nearly the same number of ON pixels and nearly the same number of OFF pixels, such that the code that is rendered by printing such glyphs (36) on substantially uniformly spaced centers appears to have a generally uniform texture. In the case of codes printed at higher spatial densities, this texture is likely to be perceived as a generally uniform gray tone. Binary image processing and convolution filtering techniques for decoding such codes also are disclosed, but this application focuses on the codes.
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Patent Agency Ranking
公开(公告)号：DE69215200D1
公开(公告)日：1996-12-19
申请号：DE69215200
申请日：1992-12-14
Applicant: XEROX CORP
Inventor： HECHT DAVID L
Abstract: Increasing the addressing capability of an optical image bar (40) having a particular pixel center-to-center spacing (pixel pitch) is accomplished by employing a plurality of N electrodes (115a,b; 117a,b; 118a,b; 120a,b) per pixel (112,113). Compared to an optical image bar with one electrode per pixel, this provides N times as many locations for the electric potential transition which establishes the center of the pixel. The provision of multiple electrodes per pixel interval can be used to implement interlacing.
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公开(公告)号：DE3686814D1
公开(公告)日：1992-10-29
申请号：DE3686814
申请日：1986-12-16
Applicant: XEROX CORP
Inventor： SPRAGUE ROBERT A , HECHT DAVID L , FLORES L PRASADAM
Abstract: An optical image bar (12) utilizing polarized light and a coherent spatial light modulator (16) includes birefrigent spatial or angular shearing means (51) for uniformly dividing the spatially-modulated output radiation of a coherent image bar into a pair of laterally-offset, redundantly-modulated, orthogonally-polarized optical field distributions. Imaging optics (17), which include any spatial filtering and/or polarization filtering elements needed for converting those field distributions into correspondingly-modulated spatial intensity distributions, bring the filtered field distributions to focus on an output image plane (13), thereby producing redundantly-modulated, laterally-offset, intensity profiles on the output image plane which spatially sum with each other on an intensity basis. The magnitude of the shear is selected so that the image plane offset of those intensity profiles is approximately equal to half the nominal image plane pixel pitch of the image bar, whereby each of the intensity profiles redundantly overwrites the interpixel intensity nulls of the other. Spatial shearing is preferred for image bars having telecentric imaging optics, but angular shearing is a practical alternative for some embodiments.
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公开(公告)号：JP2001209752A
公开(公告)日：2001-08-03
申请号：JP2000383976
申请日：2000-12-18
Applicant: XEROX CORP
Inventor： HECHT DAVID L , FLORES NOAH L , PETRIE GLENN W , RICHARD G STERNS , DAVID A JARRED
Abstract: PROBLEM TO BE SOLVED: To improve reliability in the decoding of digital information. SOLUTION: This method for decoding a plurality of glyphs includes a step in which a group of glyph images is picked up to generate image data about a predicted glyph position, a step in which a 1st value showing a possibility that each position includes a glyph in a 1st state is given in the each position, a step in which a 2nd value showing that each position includes a glyph in a 2nd state is given in the each position, in a step in which the difference between the 1st and 2nd values is decided in each latent glyph position, and a step in which a plurality of glyphs are decoded at least partially on the basis of the distribution analysis of the decided difference.
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39.发明专利
公开(公告)号：JP2002223353A
公开(公告)日：2002-08-09
申请号：JP2001376634
申请日：2001-12-11
Applicant: XEROX CORP
Inventor： HECHT DAVID L , PETRIE GLEN W , FLORES L NOAH , GORBET MATTHEW G
Abstract: PROBLEM TO BE SOLVED: To provide a user interface for a data processing system. SOLUTION: A tiled code system comprises tiles, tiled code regions and occlusion regions. Occlusions comprise user interface graphics for user selection and information. The occlusion regions occur periodically in each tile. A user uses a selection device to capture an image of a portion of a substrate that includes portions of tiled codes to complete a tile. The image is analyzed to determine the tile code pattern. A context code is determined from the tiled code pattern, and a selection code is determined from the occlusion information in the image. The context code and selection code are then processed by a syntax processor. Based on a selection or series of selections by a user, the syntax processor sends commands to the system.
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公开(公告)号：JP2002190947A
公开(公告)日：2002-07-05
申请号：JP2001290056
申请日：2001-09-21
Applicant: XEROX CORP
Inventor： LUNT TERESA F , FRANKLIN MATTHEW K , HECHT DAVID L , BERSON THOMAS A , STEFIK MARK J , DEAN R DREWS , BELL ALAN G , BREUEL THOMAS M , CASS TODD A , CURRY DOUGLAS N , GREENE DANIEL H , KRIVACIC ROBERT T
Abstract: PROBLEM TO BE SOLVED: To provide a printing method for appropriately preventing document forgery in accordance with a printed document. SOLUTION: A protection level which is to be applied to the document is decided from a plurality of protection levels by considering the value of the printed document, the latent possibility of forgery with respect to the document and cost for forgery prevention. A printer printing a watermark corresponding to the decided protection level is selected. The respective pages of the document are printed by using the printer. A mechanism for generating the evidence of copy and tracking information are incorporated in the watermark in accordance with the protection level.
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