BAR CODE READER

摘要

PURPOSE:To remove restriction from bar code display by properly fixing the average lightness of auxiliary characters to be displayed so as to be superposed to the bar code and extracting only the bar code from an electric signal obtained by photoelectric conversion. CONSTITUTION:The bar code 1 and auxiliary characters indicating the contents of the bar code 1 are superposed and displayed on an article. The average lightness of the 1st part of the auxiliary character superposed to the bar is set up to a level between the bar level and a reference level and the average lightness of the 2nd part superposed to the white part is set up between the white part and the reference level. The bar code 1 is scanned by a bar code scanner 9 and an electric signal outputted from the scanner 9 is applied to an A/D converter 10. An output from the A/D converter 10 is a value obtained by dividing the output of the scanner 9 by a reference value and encoding the divided value into a binary number and converted into a character code by a decoder and the character code is applied to a master control device 12.