Patent ID: 6181839
Filing Date: 2001-01-30
Classification: G06K

Abstract:
A two-dimensional code reader comprising:conversion means for receiving light reflected from two-dimensional code and converting the light into an image signal;storage means for storing the image signal as an image memory;code detection means for providing from the image memory a detected two-dimensional code; andcell binarization means for binarizing values of predetermined pixels for respective cells on the detected two dimensional code, andwherein said cell binarization means comprises:cell gray level extraction means for finding respective gray levels of the predetermined pixels based on image signals obtained from the predetermined pixels of the cells on the detected two-dimensional code;local threshold value determination means for finding a local threshold value from the gray levels determined by said cell gray level extraction means; andcell binary determination means for comparing each of the gray levels found by said cell gray level extraction means with the threshold value found by said local threshold value determination means to find binary data for a corresponding cell.