JPS6435672A - Method for recognizing plural column bars - Google Patents

Abstract

PURPOSE:To easily decode a bar code, and to reduce misreading by considering the first bar of a column to be analyzed at first, to be a reference, and deciding whether the bar found by retrieving other column is within a definite distance and interval from a reference bar or not. CONSTITUTION:An optical reader circuit 3 stores bar code information read by an optical reading sensor 5 in a bar code storage area 2 while synchronizing with a medium carrier circuit 4. A control pat 1 considers the first column of data stored in the area 2 to be the reference, and retrieves the bar of the reference column based on the bar of the first row of the reference column. Further, the area 2 of the next column and the column counter of the control part 1 are initialized. Next, the row counter of the control part 1 is initialized, and the inclination constant 8 of the first row is loaded. A read delay between the first column bar and the second column bar is generated by the inclination of 9 of a medium 6. Next, it is confirmed whether it is within a readable allowable range shown by the constant 8, or not, according to comparison with the head bar of the standard column, and if within the allowable range, the position setting of the first bar of a retrieved column is performed, and the following bar is successively retrieved.