Binarizing method for bar code data

Abstract

Abstract PURPOSE:To improve the rate of recognition by calculating difference between the digital value of a bar code data to be binarized and the digital value of the adjacent bar code data, comparing the difference with a prescribed reference value and binarizing the bar code data. CONSTITUTION:A bar code data f(n) read by an image scanner and converted to the digital value is inputted to a latch (LATCH) circuit 24. On the other hand, in respect to this latch circuit 24, a bar code data f(n-1) before one pixel clock minute and the current bar code data f(n) are inputted to a subtracter 26. Then, difference d(n)=f(n)-f(n-1) between those data and difference d=f(n+1)-f(n) between a data f(n+1) and the data f(n) is calculated and compared with a reference value + or -LIMIT by a comparator 28 and a data k(n+1) is outputted. The data is inputted through the latch circuit 24 to a ROM 30 and correction is calculated to correct the bar code data by increase / decrease. Thus, the rate of recognition for the bar code can be improved.

Inventors

• 👤 Masaki Izumi
• 👤 和泉　雅喜

Bibliographic Details