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    Shift register display
    2.
    发明授权
    Shift register display 失效
    移位寄存器显示

    公开(公告)号：US3662375A

    公开(公告)日：1972-05-09

    申请号：US3662375D

    申请日：1969-01-10

    Applicant: IBM

    Inventor： JOHNSTON DAVID L ,  NELSON PAUL E

    IPC: G06K9/20 ,  G06F3/153 ,  G09G1/18 ,  G09G5/32 ,  G06F3/14

    CPC classification number: G09G1/18

    Abstract: The contents of a matrix-type shift register used in an optical character reader is displayed on command on a cathode ray tube. Display is accomplished by generating a raster pattern scan for each storage position of the shift register, said raster pattern scans being at the same relative positions to one another as the storage positions in the shift register. Each raster pattern scan, referred to as a cell raster, is intensified if the corresponding shift register storage cell contains a video or ''''black bit.'''' If the storage cell does not contain a black bit, the corresponding cell raster is not intensified. A partial outline of all cell rasters may be intensified to provide a visual indication of all cell positions. The resulting pattern displayed by the cathode ray tube is a configuration which corresponds to the configuration of black bits held in the shift register.

    Abstract translation: 在光学字符读取器中使用的矩阵型移位寄存器的内容以阴极射线管的命令显示。 通过对移位寄存器的每个存储位置生成光栅图案扫描来实现显示，所述光栅图案扫描与移位寄存器中的存储位置彼此处于相同的相对位置。 如果相应的移位寄存器存储单元包含视频或“黑位”，则每个光栅图案扫描（称为单元格栅格）都会增强。 如果存储单元不包含黑色位，则相应的单元格栅格不会增强。 可以加强所有细胞光栅的部分轮廓，以提供所有细胞位置的视觉指示。 由阴极射线管显示的结果图案是对应于保持在移位寄存器中的黑位的配置的配置。

    Unformatted scanning in a character-recognition system
    4.
    发明授权
    Unformatted scanning in a character-recognition system 失效
    字符识别系统中的不间断扫描

    公开(公告)号：US3618018A

    公开(公告)日：1971-11-02

    申请号：US3618018D

    申请日：1969-06-02

    Applicant: IBM

    Inventor： JOHNSTON DAVID L ,  NELSON PAUL E

    IPC: G06K9/32 ,  G06K9/04

    CPC classification number: G06K9/32 ,  G06K2209/01

    Abstract: Scan-control apparatus responsive to a format word specifying boundaries of a document field to be scanned generates a series of search patterns for characters within the field. A ''''read'''' command causes a scanning beam to seek the intersection of horizontal and vertical boundaries contained in the format word. A line-search scan travels downward therefrom until black video is detected. A character-search scan then moves horizontally to establish the beginning of a character line. The first character is normalized, a recognition scan is initiated, and the vertical position of the line is digitally recorded. Reaching the format end-of-line boundary, or detection of a number of blank spaces, terminates the ''''read'''' command. Further ''''load-format'''' and ''''read'''' commands cause the beam to seek the format word horizontal boundary and the recorded vertical position. The field is terminated when the vertical format word boundary is attained. Tests for document and read-window ends are provided. Several types of format words enhance the flexibility of the system.

    Calibration error detection and correction in a document reading system
    5.
    发明授权
    Calibration error detection and correction in a document reading system 失效

    公开(公告)号：US3536950A

    公开(公告)日：1970-10-27

    申请号：US3536950D

    申请日：1968-07-15

    Applicant: IBM

    Inventor： JOHNSTON DAVID L ,  NELSON PAUL E ,  HOFFMANN GORDON F

    IPC: G06K9/20 ,  H01J29/70

    CPC classification number: G06K9/20 ,  G06K9/32

    Abstract: 1,252,584. Character recognition. INTERNATIONAL BUSINESS MACHINES CORP. 10 July, 1969 [15 July, 1968], No. 34806/69. Heading G4R. Document scanning apparatus comprises means for scanning a region of a document expected to include a calibration mark in accordance with a scan pattern, the position of the scan pattern being varied by a predetermined amount on detection of an error in the way in which a calibration mark is intercepted during a scanning operation. The document, which is to be read under computer control for character recognition purposes, bears an L-shaped calibration mark, the vertical and horizontal bars of the mark being 400 mils long each and the bar widths being at least 20 mils. The nominal position of the junction of the bars is specified, and the scan starts 200 mils to the left and 200 mils up from this point to perform 12 coincident 420 mil downward sweeps followed by 12 coincident 420 mil leftward sweeps (also starting from the same point). If the condition is satisfied that a 12 mil (or more) length of black is sensed in the same position in every sweep of each set of 12 but not at the beginning, the positions of these blacks on the downward and leftward sweeps are used to derive error voltages subsequently used to correct deflection voltages used in the subsequent scanning of fields for recognition. If the condition is not satisfied the scanning is repeated but with the starting point displaced 20 mils to the right and 20 mils down, if it is still not satisfied, the scanning is repeated again but with the starting point displaced 20 mils to the left and 20 mils up (from the first scanning start point). If it is not satisfied now, the document is rejected. If it is satisfied on the second or third scanning, the error voltages are derived and used as with a successful first scan. The position of the junction of the bars on a first (or master) document is set by the operator on potentiometers and whether this setting is accurate to within 40 mils (both vertically and horizontally) is automatically checked using scanning, a lamp being lit if it is. This provides the nominal position of the bar junction for subsequent use as above. The invention may be used as a modification of the systems of Specifications 1,077,094 and 1,252,583 which are referred to.

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