×

Symbol information reading apparatus

  • US 5,489,769 A
  • Filed: 05/25/1993
  • Issued: 02/06/1996
  • Est. Priority Date: 05/26/1992
  • Status: Expired due to Term
First Claim
Patent Images

1. A symbol information reading apparatus, comprising:

  • imaging means for obtaining a two-dimensional image of a bar code including bars and spaces, said imaging means including a frame memory for storing the obtained two-dimensional image of the bar code;

    position sensing means for sensing at least two points of a predetermined pattern determined in accordance with the type of the bar code, the predetermined pattern including first and second predetermined patterns, the at least two points being the positions of two corners of either one of the first and second predetermined patterns so as to read information of the bar code, even if an image of another of the first and second predetermined patterns is not stored in the frame memory, said position sensing means including;

    skip reading means for successively reading the information of the bar code from the frame memory in a predetermined direction at a predetermined interval,first sensing means for sensing the two points on the basis of an initial read position and a last read position of either one of the first and second predetermined patterns determined in accordance with the type of the bar code, said initial read position and said last read position being determined by said skip reading means,read control means for successively reading information of the bar code from the frame memory at a predetermined interval in a direction perpendicular to the predetermined direction of the skip reading means, when the two points cannot be sensed by the first sensing means, andmeans for judging the information of the bar code in either of the predetermined direction and the perpendicular direction, when sensing the two points by means of the sensing means, even if the other of the first and second predetermined patterns is not sensed;

    slope sensing means for sensing a slope of the bar code from said two points sensed by the position sensing means; and

    reading means for successively reading information of the bar code from the two-dimensional image of the bar code obtained by the imaging means, on the basis of the information obtained by said slope sensing means.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×