公开(公告)号：BR9300174A

公开(公告)日：1993-09-21

申请号：BR9300174

申请日：1993-01-22

Applicant: SYMBOL TECHNOLOGIES INC

Inventor： SHELLHAMMER STEPHEN J ,  CHEN MING-HUA ,  NIKZAD ARMAN

IPC: G06K7/016 ,  G06K7/10 ,  G06K19/06 ,  H03M13/00

Abstract: A method and apparatus for decoding a two-dimensional bar code symbol using a charge-coupled device (CCD) camera or a charge-modulation device (CMD) camera. The CCD/CMD camera takes pictures of the symbol and the picture is converted into digital data. The location and orientation of the two-dimensional bar code symbol is determined and verified. Defects and damages on the symbol are detected and corrected. The symbol is scanned to read the codewords of the two-dimensional bar code symbol.