A method of the automatic recognition which enables
to input alphabet, numeral, mark, etc. digitally
into the computer by replacing them under an algorithm,
to the 1-dimentional black/white pattern (actually 2-D for
it has several width).
In this case, binary digits.
One of the types of barcode.
bar widths consist of 2 types: narrow
bar and wide bar:
CODE-39, CODABAR, 2 of 5 barcodes, etc. (See Multi-level)
Bar Width Reduction.